Forces and Motion. Team １ Team ２ Forces Motion Speed Velocity Acceleration Velocity.

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Presentation transcript:

Forces and Motion

Team １ Team ２ Forces Motion Speed Velocity Acceleration Velocity

A force is a ________ or a ________. A force is a ________ or a ________.

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 _________.

Answer: zero

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 __________.

Answer: motion

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

Answer: A car turning a corner

_________ 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.

Answer: constant

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 __________.

Answer: speed or velocity or acceleration

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 _________.

Answer: speed

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

Answer: net force

_________ 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?

Answer: 5N north

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.

Answer: D. all of the above

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.