What is friction?

• A force that occurs when two surfaces rub against each other

• A type of energy

• A type of material

• A type of sound

Why are treads important on bike tires?

• They increase friction, helping to keep the rider safe

• They decrease friction, making the bike faster

• They make the bike look more stylish

• They are not important

What happens when you squeeze the brake lever on a bike?

• The brake pads press against the wheel rim, creating friction to slow down or stop the bike

• The bike speeds up

• The tires inflate

• The bike changes direction

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which type of bike tire is best for rough ground?

• Mountain bike tires with treads and knobs

• Road bike tires with smooth treads

• Bald tires with no treads

• Flat tires

How does friction affect riding a bike?

• It helps the tires grip the road and the brakes to stop the bike

• It makes the bike fly

• It has no effect

• It makes the bike heavier

Tags

NGSS.MS-PS2-2