Free Fall

An object falls freely from rest near the surface of Earth. What is the speed of the object after having fallen a distance at 4.90 meters?

• 9.80 m/s

• 96.1 m/s

• 4.90 m/s

• 24.0 m/s

Answer explanation

Use v_f² = v_i² +2ad

Which is constant for a freely falling object?

• displacment

• acceleration

• velocity

• speed

Answer explanation

Only acceleration is constant in free fall on Earth, at 9.81m/s²

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground
• It accelerates at a non-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 reaches terminal velocity

A textbook is dropped from a second floor window and falls to the ground. What happens to the velocity as the book falls to the ground

• the velocity increases

• the velocity decreases

• the velocity remain constant

A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

A textbook is dropped from a second floor window and falls to the ground. What direction is the velocity?

• upward

• downward

A textbook is dropped from a second floor window and falls to the ground. What direction is the acceleration?

• upward

• downward

The acceleration of a freely falling body on Earth is

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

If an object is dropped from a cliff of 100m, what are your 'givens' you can start with?

CHECK ALL THAT APPLY.

HINT: Think of the I in PIES.

• d = 100 m

• v_i = 0

• t = 100 s

• a = 9.8 m/s²

• v_f = 0

A man drops his camera off of the top of the oil derrick tower at Six Flags. Which of the following kinematic equations would he use in order to calculate the speed the camera was travelling when it hit the ground?

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