Front

Friction is an example of _____________

Back

contact force

Front

The direction of force of friction is always _____ to the direction of motion.

Back

opposite

Front

Without friction, an object in motion would never stop.

Back

true

Front

Frictional force depends on:
- surface area in contact
- roughness of surface
- both a and b
- none of the above

Back

both surface area in contact and roughness of surface

Front

Which of these materials would have the MOST amount of friction? Options: metal, tile, sand paper, denim

Back

sand paper

Front

The rougher the surface, the faster an object will travel over the surface.

Back

false

Front

How would the absence of friction affect a marble travelling on a long, straight path?

Back

the marble would remain at a constant speed

Front

The amount of friction depends on the weight of the objects pressing together.

Back

true

Front

Rough surfaces have _________

Back

greater friction

Front

What happens when we rub our hands together?

Back

All of the above: frictional force works between them, energy is released, our hands become warm.