Forces and Motion Review

What is the unit for speed?

• meters
• seconds per meter
• meters per second

A student wants to conduct an experiment to find out how the speed of a cart affects its kinetic energy. They should

• keep all variables constant except for the kinetic energy of the cart.

• keep all variables constant except for the speed of the cart.

• keep all variables constant except for the mass of the cart.

If you want to increase the kinetic energy of a moving object, which would have a greater impact: tripling its mass or tripling its speed?

• tripling the object’s mass

• tripling the object’s speed

• tripling both have equal effects

What happens to a moving object if it has a net force of 0?

• It will stop moving.

• It will change direction.

• It will keep traveling in the same speed and direction

What does it take to change the direction or speed of an object?

• more than one force
• an unbalanced force
• a balanced force

A ball rolls across a smooth surface at a steady 2.5 m/s. What is its acceleration?

• 0 m/s2
• 9.8 m/s2
• 2.5 m/s2

Which of the following describes an object that is speeding up? The object is

• at rest.
• accelerating.
• in a frictionless environment.

When a person leans against a wall, they exert a force on the wall. The wall

• applies a larger force on the person in the opposite direction.

• applies the same size force on the person in the same direction

• applies the same size force on the person in the opposite direction.

A car accelerates down the road. What is the “reaction” to the tires pushing on the road? (think about Newton's 3rd law)

• the air in the tires moving the car
• the mass of the car pushing on the tires
• the road pushing on the tires

The criteria of an engineering project describe the ________________ of the design

• goals and desired features
• nonessential parts
• limitations