Free Fall

Multiple Select

An object that is free-falling is acted upon by the force of gravity alone.

• TRUE

• FALSE

Multiple Select

An object in free fall experiences an acceleration which is independent of the mass of the object.

• TRUE

• FALSE

Multiple Select

A very massive object will free fall at the same rate of acceleration as a less massive object.

• TRUE

• FALSE

Multiple Select

A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state of free fall.

• TRUE

• FALSE

Multiple Select

A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards.

• TRUE

• FALSE

Multiple Select

The symbol g stands for the force of gravity.

• TRUE

• FALSE

Multiple Select

The value of g on Earth is approximately 9.8 m/s².

• TRUE

• FALSE

Multiple Select

A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.)

• TRUE

• FALSE

Multiple Choice

In Physics world, what happens when an object falls?

• It accelerates at a constant rate until it hits the ground.

• It accelerates at a constant rate until it reaches terminal velocity.

• It accelerates at a non-constant rate until it hits the ground.

• It accelerates at a non-constant rate until it reaches terminal velocity.

Multiple Choice

If a free-falling object were somehow equipped with a speedometer, its speed reading would increase each second by __________.

• about 5 m/s

• about 15 m/s

• about 10 m/s

• a rate that depends on its initial speed

Multiple Choice

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

When the velocity of an object does not change, what happens to its acceleration?

• Nothing, it does not accelerate.

• It is a changing acceleration.

• It is a constant acceleration.

Multiple Choice

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

• the leaf

• the stone

• They would accelerate at the same rate.

• It is difficult to determine without more information.

Multiple Choice

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

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

Multiple Choice

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, what would be the speed of the ball when caught?

• less than the speed it had when thrown upwards

• the same as the speed it had when thrown upwards

• more than the speed it had when thrown upwards

Multiple Choice

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?

• midway on the way up

• the instant it leaves the catcher's hand

• the instant before it arrives in the catcher's mitt

• at the top of its path

Multiple Choice

Which of the following statements applies to motion of a ball rising and then falling in free fall?

I. The ball has constant acceleration as it moves upward.

II. The ball has constant acceleration at the top of its path.

III. The ball has constant acceleration as it moves downward.

• I only

• I and III

• III only

• 1, 2 and III

Multiple Choice

What is the velocity of a ball that has been dropped off a cliff after 1 s, 2 s, 3 s, 4 s and 5 s? (Assume g is rounded off to 10 m/s²)?

• 10, 20, 30, 40, 50 m/s

• 5, 20, 45, 80, 125 m/s

• 5, 10, 15, 20, 25 m/s

• 10, 10, 10, 10, 10 m/s

Multiple Choice

Angelo drops a pile of roof shingles from the top of a roof located 8.52 meters above the ground. Determine the time required for the shingles to reach the ground.

• 1.00 s

• 1.30 s

• 1.31 s

• 1.32 s

Multiple Choice

Carl throws his mother's crystal vase vertically upwards with an initial velocity of 26.2 m/s. Determine the height to which the vase will rise above its initial height.

• 35.00 m

• 35.02 m

• 40.00 m

• 42.02 m