Friction test

Which is the definition of friction?

• A force that keeps us on the ground.

• A force that can move objects without even touching it.

• A force that attracts two objects with mass.

• A force that happens when two objects touch or rub each other.

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

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

• similar
• opposite
• parallel
• west

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Which would NOT be a way of reducing friction?

• making the surfaces smoother
• using lubricants such as waxes, oils, or grease
• changing from sliding friction to rolling friction using ball bearings
• Using kitty litter on snow and ice to help your car gain traction

Tags

NGSS.MS-ETS1-2

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

Tags

NGSS.MS-PS2-1

A big wooden box is being pushed on the ground from east to west direction. The force of friction due to ground will act on this box towards:

• north direction

• south direction

• east direction

• west direction

What is rolling friction?

• friction between two surfaces that aren't moving relatively to each other

• friction between a rolling object and the surface that it is rolling on

• friction where an object rubs against another surface

• friction of something going through any type of liquid or air

How could you reduce sliding friction?

• add wheels to the object

• add bacon grease to the object

• add glue to the object

• add motor oil to the object

• add bearings to the object

Tags

NGSS.MS-PS2-2

The students in Mrs. Hoffman’s class played tug-of-war. The girls pulled in one direction with a force of

150 N. The boys pulled in the opposite direction with a force of 100 N. Who won the game and why did they win?

• The boys won because they applied a stronger force to the

  rope

• The boys and the girls tied because they applied equal

  forces to the rope

• The girls won because they applied a stronger force to the

  rope

• Too much force was applied, the rope broke

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2