A.1 - 13 - Free Fall

What is the primary condition for an object to be considered in free fall?

• It is moving at a constant velocity.

• The only force acting on it is air resistance.

• The only force acting on it is gravity.

• It is stationary on the ground.

What is the approximate acceleration due to gravity on Earth for an object in free fall?

• 0 m/s²

• 9.81 m/s² upward

• 9.81 m/s² downward

• It varies depending on the object's mass.

If an object is thrown straight upward and is in free fall, what is the direction of its acceleration as it moves upwards?

• Upward, then downward.

• Always downward.

• Zero at the highest point.

• It depends on the initial velocity.

When an object is described as being "dropped" in a physics problem, what is its initial velocity?

• Its velocity is equal to the acceleration of gravity.

• Its velocity is 0 m/s.

• Its velocity is negative.

• Its velocity is unknown without more information.

A ball is dropped from a height of 10 meters. Assuming acceleration due to gravity is 9.81 m/s² downwards, what is its velocity just before it hits the ground?

• 9.81 m/s

• 10 m/s

• 14 m/s

• 19.6 m/s

A ball is thrown vertically upward with an initial velocity of 10 m/s. What is the maximum height it will reach? (Assume acceleration due to gravity is -9.81 m/s² when upward is positive).

• 10 meters

• 5.1 meters

• 19.6 meters

• 0 meters

If a ball is thrown vertically upward with an initial velocity of 10 m/s, how much time will it take to reach its maximum height? (Assume acceleration due to gravity is -9.8 m/s² when upward is positive).

• 0.51 seconds

• 1.02 seconds

• 2.04 seconds

• 9.8 seconds

Which statement accurately describes the acceleration of an object in free fall on Earth?

• It is always 0 m/s².

• It is always 9.81 m/s² upwards.

• It is always 9.81 m/s² downwards.

• It varies depending on the object's mass.