Unit 7: Free Fall Conceptual Questions

In Newtonian physics, ________________ is any motion of a body where gravity is the only force acting upon it.

• kinematics

• free fall

• mechanics

• velocity

The standard acceleration due to gravity (or standard acceleration of free fall),is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as:

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

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

The change in velocity in a given time period is?

• V_i

• V_f

• a

• d

Do free falling objects move at constant velocity or do they accelerate?

• Falling objects accelerate at -9.8 m/s²
• Falling object move at constant velocity
• Falling objects accelerate at 100 m/s²
• It depends on the mass: heavy objects accelerate, light objects do not

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

What happens to the velocity of a ball as it is dropped off a cliff?

• It decreases at a uniform rate

• It increases at a uniform rate

• It is constant

• It increases at a non-uniform rate