, 26.12.2019Echo009

# Question 1 (10 points) the path a projectile takes is known as the question 1 options: vertical component trajectory horizontal component parabola question 2 (10 points) which of the following is not an example of a projectile? question 2 options: a baseball that has been pitched a rock being thrown over a bridge a person sitting in a chair, not moving a car driving off a cliff question 3 (10 points) a plane is flying east when it drops some supplies to a designated target below. the supplies land after falling for 10 seconds. how high above the ground was the airplane when the supplies were dropped? (hint: d = 1/2gt2; g = -9.8 m/s2) question 3 options: 120 meters 490 meters 980 meters 49 meters question 4 (10 points) as the supplies fell, they traveled 650 meters horizontally. how fast were the supplies and the airplane moving forward? remember that it took 10 seconds for them to reach the ground. (hint: v = d/t) question 4 options: 65 m/s 6500 m/s 0.154 m/s 660 m/s question 5 (10 points) a projectile has a vertical component and a horizontal component. question 5 options: true false question 6 (10 points) the shape of a projectile's trajectory is an ellipse. question 6 options: true false question 7 (10 points) which of the following is not true about a vertical component? question 7 options: the vertical component of a projectile changes due to gravity. the vertical component acts the same as an object in free fall. the vertical component always equals the horizontal component. question 8 (10 points) during the course of trajectory, the horizontal component of the velocity is question 8 options: constant increasing decreasing negative question 9 (10 points) in the simulation above, as the projectile travels upward, how does the vertical velocity change? question 9 options: vertical velocity remains the same. vertical velocity decreases. vertical velocity is zero. vertical velocity increases. question 10 (10 points) in the simulation above, as the projectile travels downward, how does the vertical velocity change? question 10 options: vertical velocity decreases. vertical velocity is zero. vertical velocity remains the same. vertical velocity increases.\

The path a projectile takes is called Trajectory

Explanation:

According to Physics, in terms of projectile motion, trajectory is the curved path that an object follows when it travels in open space. It has two components x and y. X component shows the range while y component shows the height of the projectile.

The odd choice out of these options is A person sitting in a chair, not moving

Explanation:

As we know that it is necessary for a projectile motion that some movement must be there. Therefore some movement is necessary in a curved path. Since the person sitting in a chair is not moving and he is in rest so he cannot be considered as moving because he is not changing his position with respect to an observer.

The distance will be 490 meters

Explanation:

According to second equation of motion

S= vit + ½ gt²

Putting the values

S = 0 + ½ (9.8) (10)

S = 490 meters

The speed will be 65m/s

Explanation:

As we know that

Speed = Distance / Time

So putting the values

Speed = 650 / 10

Speed = 65 m/s

The given statement is true

Explanation:

A projectile motion is composed of two components. X component is responsible for showing the range of the projectile and it starts from the origin or starting point while on the other hand Y component is responsible for the height of the projectile. We plot the maximum height that a projectile can gain on the Y axis of a graph.

The given statement is false

Explanation:

There is a difference in the shape of parabola and ellipse. The shape of projectile graph is a parabola, not an ellipse. The equation of a projectile gives us two values at two different points.  Since it is a quadratic equation so that is why this type of motion gives parabola and not an ellipse.

The false statement is vertical component is always equals to horizontal component.

Explanation:

The horizontal component of a projectile is X and it is constant which means no force is acting on it whereas y component has a force of gravity as the body goes up or comes down so both of these components can never be the same.

During the course of trajectory, the horizontal component of the velocity is constant.

Explanation:

The horizontal component of trajectory is the X component. This component does not have any force upon it except the force of friction of earth and object. The force of friction is also acting in x axis that is why we can say that during the course of trajectory, the horizontal component of the velocity is constant.

In the simulation above, as the projectile travels upward, its vertical velocity decreases

Explanation:

We know that for a body moving up or down is affected by gravity so whenever an object moves against the force of gravity, it’s acceleration and velocity decreases because the gravitational pull tends the object to stay it on earth surface.

In the simulation above, as the projectile travels downward,  the vertical velocity increases

Explanation:

When a body moves up or down it is affected by gravitational pull. As the body comes towards the earth the gravitational acceleration increases with the rate of 9.8m/s². This acceleration is taken as positive and when the projectile hits the ground it is in its maximum speed.

The path a projectile takes is known as the Trajectory

Explanation:

Trajectory is the curved path that an object follows when it travels in space. It has two components x and y. X shows the range while y shows the height

Question 2

The odd choice is A person sitting in a chair, not moving

Explanation:

As the name suggests, projectile motion is a type of motion. The person sitting in a chair is not moving and he is in rest so he cannot be taken into motion category.

Question 3

490 meters

Explanation:

According to second equation of motion

S= vit + ½ gt²

Putting the values

S = 0 + ½ (9.8) (10)

S = 490 meters

Question 4

The sped is 65m/s

Explanation:

As we know that

Speed = Distance / Time

So putting the values

Speed = 650 / 10

Speed = 65 m/s

The statement is true

Explanation:

A projectile motion is composed of two components. X component is responsible for showing the range and Y component is responsible for the height of the projectile.

The given statement is false

Explanation:

The shape of projectile graph is a parabola, not an ellipse. The equatuion of a projectile gives us two values because it is a quadratic equation so that is why this type of motion gives parabola and not an ellipse.

The vertical component always equals the horizontal component.

Explanation:

The horizontal component of a projectile is X and it is constant which means no force is acting on it whereas y component has a force of gravity so both of these components can never be the same.

During the course of trajectory, the horizontal component of the velocity is constant

Explanation:

The horizontal component of trajectory is the X component. This component does not have any force upon it except the force of friction of earth and object. The friction force is also acting in x axis that is why we can say that during the course of trajectory, the horizontal component of the velocity is constant .

In the simulation above, as the projectile travels upward,its vertical velocity decreases

Explanation:

Whenever an object moves against the force of gravity, it’s acceleration and velocity decreases because the gravitational pull tends the object to stay it on earth surface.

In the simulation above, as the projectile travels downward,  the vertical velocity increases

Explanation:

As the body comes towards the earth the gravitational acceleration increases with the rate of 9.8m/s². This acceleration is taken as positive and when the projectile hits the ground it is in its maximum speed.

The vertical velocity increases

Explanation:

The motion of the ball is the motion of a projectile, which consists of two independent motions:

- a horizontal motion, with constant velocity

- a vertical motion, with constant acceleration (g=9.8 m/s^2) directed downward

When the ball is travelling downward, its vertical velocity is directed downward. The acceleration is in the same direction (downward), so the vertical velocity is increasing.

The vertical velocity increases.

The vertical velocity increases because of acceleration due to gravity.  The horizontal velocity neither accelerates nor decelerates.

Hope this helps!!

As the projectile travels downward, the vertical velocity increases.

Option D

Explanation:

If the object was thrown up, it will tend to reach the ground to the gravitational pull. So, exhibiting a projectile motion with an initial velocity, the object travels some distance in air with constant horizontal velocity and varying vertical velocity.

When the object is moving downward, the gravitational force will be more leading to increase in the acceleration and vertical velocity of the object. Thus, the vertical velocity will increase due to the increase in gravitational force acting on the projectile.

1. Trajectory

The path a projectile is called a trajectory in physics. It has a vertical component and even makes a parabola, but if we are talking about physics, it is trajectory.

2. A person sitting in a chair

Projectiles can be defined as an object that is in flight. So it has to be in the air. Since a person sitting in a chair is not in flight, then it is NOT a projectile. (Unless you throw the person in the air while he is in the chair)

3. 490 meters

We have the formula and our given:

d = 1/2gt²

Just plug in the values to get your

d = 1/2(-9.8m/s²)(10s)²

d = (-4.9m/s²)(100s²)

d = -490m

So since height is a scalar value, just take out the negative sign.

4. 65 m/s

Again we have our formula and given:

So we just plug in our values:

5. True

A projectile, if you will notice its trajectory moves both horizontally and vertically. The horizontal motion is what we call the x-component and the vertical is called the y-component. This is what gives it its' curved path.

6. False

An ellipse is an oval-shaped path. A projectile does not move in a circular/oval path. It travels a curved path. It can be parabolic. It is curved but it does not follow a circular path.

7. The vertical component always equals the horizontal component

This is false. Vertical component is different from the horizontal component. The horizontal component is not influenced by gravity only the vertical component. So in short, the horizontal component is the same throughout, but the vertical component changes over time.

8. Constant

Like mentioned above, the horizontal movement is constant or it does not change. This is because a projectile is defined also as an object that is influenced solely by gravity.

9. Vertical velocity decreases

This is because the movement is against the pull of gravity. It will continue to decrease until it will eventually come to a stop and start to descend. As it descends it increases.

10. Vertical velocity increases

I guess explained it above. As the object descends, the vertical movement increases. This is why you can actually die at certain heights. It increases as the time in flight increases. So the longer in flight, the faster it will get.

1). trajectory

2). person sitting in a chair

3). 490 meters

4). 65 m/s

5). False.  The projectile's displacement, velocity, and acceleration have vertical and horizontal components, but the projectile doesn't.

6). False

7). The vertical component of a projectile doesn't change due to gravity, but the vertical components of its displacement, velocity, and acceleration do.

The vertical components do NOT equal the horizontal components.

8). Decreasing if you include the effects of air resistance.  Constant if you don't.  Gravity has no effect on horizontal velocity.

9). We can't see the simulation.  But if the projectile doesn't have jets on it, then as it travels upward, its vertical velocity must decrease, because gravity is trying to not let it get away.

10). We can't see the simulation.  But if the projectile is traveling downward, we would call that "falling", and its vertical velocity must increase, because gravity is pulling it downward.

The path a projectile takes is called Trajectory

Explanation:

In terms of projectile motion, trajectory is the curved path that an object follows when it travels in space. It has two components x and y. X component shows the range while y component shows the height of the projectile.

The odd choice out of these options is A person sitting in a chair, not moving

Explanation:

For a projectile motion, movement is necessary in a curved path. Since the person sitting in a chair is not moving and he is in rest so he cannot be considered as moving.

The distance will be 490 meters

Explanation:

According to second equation of motion

S= vit + ½ gt²

Putting the values

S = 0 + ½ (9.8) (10)

S = 490 meters

The speed will be 65m/s

Explanation:

As we know that

Speed = Distance / Time

So putting the values

Speed = 650 / 10

Speed = 65 m/s

The given statement is true

Explanation:

A projectile motion is composed up of two components. X component is responsible for showing the range and Y component is responsible for the height of the projectile.

The given statement is false

Explanation:

The shape of projectile graph is a parabola, not an ellipse. The equation of a projectile gives us two values at two different points.  Since it is a quadratic equation so that is why this type of motion gives parabola and not an ellipse.

The false statement is vertical component is always equals to horizontal component.

Explanation:

The horizontal component of a projectile is X and it is constant which means no force is acting on it whereas y component has a force of gravity so both of these components can never be the same.

During the course of trajectory, the horizontal component of the velocity is constant.

Explanation:

The horizontal component of trajectory is the X component. This component does not have any force upon it except the force of friction of earth and object. The force of friction is also acting in x axis that is why we can say that during the course of trajectory, the horizontal component of the velocity is constant.

In the simulation above, as the projectile travels upward, its vertical velocity decreases

Explanation:

Whenever an object moves against the force of gravity, it’s acceleration and velocity decreases because the gravitational pull tends the object to stay it on earth surface.

In the simulation above, as the projectile travels downward,  the vertical velocity increases

Explanation:

As the body comes towards the earth the gravitational acceleration increases with the rate of 9.8m/s². This acceleration is taken as positive and when the projectile hits the ground it is in its maximum speed.

1. Parabola

The path taken by a projectil is known as parabola, and it consists of two independent motions:

- along the horizontal direction, it is a uniform motion with constant speed

- along the vertical direction, it is an accelerated motion with constant acceleration, g=9.8 m/s^2 downward

2. A person sitting in a chair, not moving

This is NOT a motion of a projectile. In fact, the person is not moving at all, so this is not a motion.

3. 490 meters

The supplies will move of uniform accelerated motion, with constant acceleration g=9.8 m/s^2, so the distance they cover is given by

4. 65 m/s

The horizontal motion of the supplies is a uniform motion, with constant speed equal to the ratio between the horizontal distance covered and the time taken:

5. True

As explaned in exercise 1), a projectile has two independent motions: one along the horizontal direction and one along the vertical direction. Therefore, it also has a horizontal component of the velocity (which is constant) and a vertical component of the velocity (which changes because there is an acceleration acting along this direction)

6. False

As stated in exercise 1) and 2) the trajectory of a projectile is a parabola, not an ellipse.

7. The vertical component always equals the horizontal component

This statement is not true: as we said, the horizontal component of the velocity is constant, while the vertical component constantly changes, so they cannot be always equal (in fact, they will be equal only at some precise instant of the motion)

8. constant

As stated before, there is no force acting along the horizontal direction of the projectile's motion, so the horizontal acceleration is zero, and this means that the horizontal velocity is constant.

9. Vertical velocity decreases.

When the projectile is moving upward, its vertical velocity decreases, because the acceleration (which acts downward) acts in the opposite direction of the velocity. More specifically, the vertical velocity is given by

where v0y is the initial vertical velocity of the projectile, t is the time and g=9.8 m/s^2.

10.  Vertical velocity increases.

When the projectile is moving downward, its vertical velocity increases, because the acceleration (which acts downward) this time is acting in the same direction of the velocity

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