Projectile Motion

A rock is thrown vertically upward reaches a maximum height of 25 meters above the surface of earth. What is the rocks speed at its maximum height?

0.0 m/s

What launching angle produces the greatest range if the launch and landing heights are the same?

45 degrees

For a constant launch speed, which angle produces the same range as a launch angle of 30 degrees?

60 degrees

At what point of the ball's path shown in the figure above is the vertical component of the ball's velocity zero?

B

In the figure above, at which point is the ball's speed about equal to the speed at which it was tossed?

C

In the figure above, the magnitude of the ball's velocity is greatest at location

D

In the absence of air resistance, a penny and a feather dropped at the same height:

Fall at equal rates

An object falling to earth in the absence of air resistance:

Falls with constant acceleration of 9.8 m/s^2

What is the main force acting on an object undergoing free fall?

Gravity

Which of the following statements applies to the motion of a ball rising and then falling in free fall? I. The ball has constant acceleration as it moves upwards II. The ball has a constant acceleration at the top of its path III. The ball has constant acceleration as it moves downwards

I, II, and III

A ball is thrown up at an angle of 38 degrees to the horizontal. What happens to the magnitude of the balls vertical acceleration during the total time interval that the ball is in the air?

It remains the same

A ball is thrown vertically into the air. Which statement is correct?

On the way up, the balls acceleration is directed downward

A spiller throws a grenade horizontally from the top of a cliff. Which of the following curves best describes the path taken by the grenade?

Parabola

What is an object launched into the air called?

Projectile

Which graph best represents the motion of an object (traveling through the air or other medium), upon which the only force acting is gravity?

The graph with a curve

Which would fall with greater acceleration in a vacuum, a leaf or a stone?

They would accelerate at the same rate

Which would hit the ground first if dropped from the same height in a vacuum, a feather or a metal bolt?

They would hit at the same time

Which of the following is NOT an example of projectile motion?

a hot-air balloon drifting toward Earth

Which of the following is an example of projectile motion?

a thrown baseball

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

at the top of its path

In the figure above, the horizontal component of the ball's velocity at A is

equal to the horizontal component of its initial velocity

Acceleration due to gravity is also called

free-fall acceleration

Which of the following is the motion of objects moving in two dimensions under the influence of gravity?

projectile motion

The path of a projectile through space is called its:

trajectory