Forces and Motion Forces Acceleration Motion Velocity Speed

Forces and Motion

Forces Acceleration Motion Velocity Speed Team１ Team２

A force is a ____ or a ____.

A force is a ____ or a ____. Answer: A push or a pull.

Balanced forces produce a net force of _____.

Balanced forces produce a net force of _____. Answer: zero

Rolling friction is usually A. less than B. more than C. equal to sliding friction.

Rolling friction is usually A. less than B. more than C. equal to sliding friction. Answer: Less than

Unbalanced forces are necessary to cause a change in _____.

Unbalanced forces are necessary to cause a change in _____. Answer: motion

You can run 100 meters in 10 seconds. What is your speed?

You can run 100 meters in 10 seconds. What is your speed? Answer: 10 m/s

An example of acceleration is: A. a hovering helicopter B. a car turning a corner C. bicycling at 40 m/s

An example of acceleration is: A. a hovering helicopter B. a car turning a corner C. bicycling at 40 m/s Answer: A car turning a corner

_____ friction includes both liquids and gases.

_____ friction includes both liquids and gases. Answer: Fluid

A student riding her bicycle on a straight, flat road covers one block every 7 seconds. If each block is 100 m long, she is traveling at _____ speed or velocity.

A student riding her bicycle on a straight, flat road covers one block every 7 seconds. If each block is 100 m long, she is traveling at _____ speed or velocity. Answer: constant

A force is expressed in ______.

A force is expressed in ______. Answer: Newtons

If a bus traveling 15 m/s south speeds up to 20 m/s, this is a change in _____.

If a bus traveling 15 m/s south speeds up to 20 m/s, this is a change in _____. Answer: speed or velocity or acceleration

Acceleration is the rate of change in ______.

Acceleration is the rate of change in ______. Answer: velocity (also accept speed or direction)

The distance divided by the time it took to travel that distance is an object’s _____.

The distance divided by the time it took to travel that distance is an object’s _____. Answer: speed

When you combine all forces acting on an object you get the ______.

When you combine all forces acting on an object you get the ______. Answer: net force

_____ is a force that opposes motion.

_____ is a force that opposes motion. Answer: Friction

What is the net force when you combine a force of 7 N north with a force of 2 N south?

What is the net force when you combine a force of 7 N north with a force of 2 N south? Answer: 5 N north

Moving blades of a windmill or a pinwheel are example of ______ acceleration.

Moving blades of a windmill or a pinwheel are example of ______ acceleration. Answer: centripetal

Decreasing velocity can be referred to as: A. acceleration B. deceleration C. negative acceleration D. All of the above.

Decreasing velocity can be referred to as: A. acceleration B. deceleration C. negative acceleration D. All of the above. Answer: D. all of the above

Are the forces on a kicked soccer ball balanced or unbalanced? How do you know?

Are the forces on a kicked soccer ball balanced or unbalanced? How do you know? Answer: Unbalanced because the ball changes speed and/or direction.