7 Science - Friction - Revision

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

• similar
• opposite
• parallel
• west

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

• True
• False

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

What does friction produce?

• light
• sound
• heat
• gravity

Tags

NGSS.MS-PS3-3

What is fluid friction?

• friction is 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 slides rubs against another surface

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

What is sliding 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

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

The weight of an object varies with the:

• pull of gravity

• dimensions of the object

• volume of the object

Friction can be increased by making the surface

• rough

• smooth

• does not depend on the nature of surface

• none of these