Sc 6 2.2 'Forces and Friction Rolling, sliding, static

Types of friction include

• static friction.

• sliding friction.

• rolling friction

• all of the above

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

Without friction, an object in motion would never stop.

• true

• false

Rough surfaces have _________ compared to smoother surfaces.

• greater friction

• less friction

• the same level of friction

On which surface will a toy car travel the furthest?

• Carpet
• Polished Wood
• Ice

Which type of friction is shown in the picture?

• fluid

• static

• rolling

• sliding

Friction always

• (a) opposes the motion

• (b) helps the motion

• (c) both (a) and (b)

• (d) none of these

You can move heavy boxes by sliding them over the ground, or you can put them on a dolly and then roll them over the ground. Which way makes it easier to move the boxes? Why?

• Sliding the boxes on the floor is easier than using the dolly because rolling friction is less than sliding friction

• Sliding the boxes on the floor is easier than using the dolly because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because rolling friction is less than sliding friction.