4C Friction Retest

Front

Why are new tires on a car better than older, worn tires?

Back

New tires provide more friction on the road than older tires.

Front

What is the unit called that measures force?

Back

Newton

Front

Friction is a force that acts in an ___________ direction of movement.

Back

opposite

Front

What does friction produce?

Back

heat

Front

How does friction affect speed?

Back

More friction decreases speed.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object.

Front

What factors affect the amount of friction?

Back

Surface texture, weight of the object, and the materials in contact.

Front

What is static friction?

Back

Static friction is the friction that prevents an object from starting to move.

Front

What is kinetic friction?

Back

Kinetic friction is the friction acting on an object that is already in motion.

Front

How can friction be reduced?

Back

Friction can be reduced by using lubricants, smoothing surfaces, or using wheels.