Friction

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 does friction produce?

• light
• sound
• heat
• gravity

Tags

NGSS.HS-PS3-4

Which of the following answers is the most scientific answer for the question:

What is friction?

• The random force between two solids, liquids, or gases.

• The contact force between two solids, liquids, or gases that slide past one another.

• The thing that creates static electricity

• A force that is random

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Which of the following is an example of friction that is harmful?

• Pencil marking on paper
• Engine parts wearing out
• sand placed on ice in the winter
• Using an eraser to erase marks

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