Friction

Friction is an example of

• contact force

• non contact force

• both of these

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

• same

• opposite

• unchanged

Without friction, an object in motion would never stop.

• true

• false

Tags

NGSS.HS-PS2-1

Which of these materials do you predict would have the MOST amount of friction?

• metal

• sand paper

• tile

• denim

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

• true

• false

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

• the marble's speed would decrease

• the marble would remain at a constant speed

• the marble's speed would increase

• the marble would stop immediately

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

When we rub our hands together ____________________.

• frictional force works between them

• our hands become warm

• energy is released

• all of the above

Tags

NGSS.MS-PS3-5

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Objects that are smooth have LESS friction than objects that are rough.

• true

• false

Imagine you decide to jump our of an airplane. Which force is going to pull you down towards earth?

• fluid friction

• static friction

• gravity

• the wind from the airplane

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

True or False: If you push a box across a surface like ice with no friction, it will NEVER stop.

• True: as long as it doesn't run into something it will keep going and going and going.

• False: it will stop very quickly.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2