Friction and Force

When we pour sand on an icy road, what force are we increasing to help cars stay on the road?

• electricity

• magnetism

• friction

• gravity

What are 2 factors that determine the amount of friction between 2 objects?

• Force and roughness between surfaces

• The color and brightness of the objects

• How smelly or not smelly the objects are

• Whether Grogu is using his levitation powers or not... May the Force be with you, always!

Rough surfaces have _________ compared to smoother surfaces.

• greater friction

• less friction

• the same level of friction

• no friction

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

• similar

• opposite

• parallel

• upward

Tags

NGSS.HS-PS2-1

In the diagram below, a girl sits on a sled and slides down a hill of snow. The arrow that represents the force of friction opposing the motion of the sled down the hill is (a)   .

• Arrow A

• Arrow B

• Arrow C

• Arrow D

Tags

NGSS.MS-PS2-2

A force that resists the movement of one surface past another surface.

• Acceleration

• Gravity

• Friction

• Lubricant

What affects friction? Choose all that apply

• The mass of the object (how big it is)

• The surface area of the two objects touching

• The color of the object

• The type of surface that the object is placed onto.

In which of the following scenarios will the object experience maximum friction?

• Smooth object over smooth surface

• Smooth object over rough surface

• Rough object over smooth surface

• Rough object over rough surface

Answer explanation

The force of friction will be maximum when both, the object and the surface, are rough.

It is difficult to walk on an oily floor because

• Force of friction is very less

• Force of friction is very high

• we don't like to walk on oily floor

• None of these

Tags

NGSS.MS-PS2-2

You are driving your car normally and you do something to make your tires slip. Which statement is correct?

• The friction is now kinetic friction and you now have less friction

• The friction is now kinetic friction and you now have more friction

• The friction is now static friction and you now have less friction

• The friction is now static friction and you now have more friction

Tags

NGSS.MS-PS2-2