Question

Question 1 (1 point)

Answer 1

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.

Answer 2

Answer 1:

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  

Answer 5:

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.  

Answer 6

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.

Answer 7:

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.

Answer 8:  

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 .

Answer 9  

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.

Answer :10

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.