Friction

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

Tags

NGSS.MS-PS2-1

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• Force
• Friction
• Static
• Kinetic 

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

Tags

NGSS.MS-PS2-2

Wheels on a skateboard most likely experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Sally experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

How does friction affect speed?

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

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

Which type of friction occurs when an object moves through a liquid or gas?

• sliding
• fluid
• static
• rolling

Rougher surfaces have ...

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

What is defined as a push or pull?

• force

• motion

• vector

• speed

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2