Static and Kinetic Friction

Rough surfaces have _________ compared to smoother surfaces.

• greater friction

• less friction

• the same level of friction

Which of these materials do you predict would have the MOST amount of friction

• Metal

• Tile

• Sand Paper

• Denim

Which type of friction is shown in the picture?

• fluid

• static

• rolling

• sliding

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

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

• Force

• Friction

• Static

• Kinetic 

How does friction affect speed?

• more friction decreases speed

• more friction increases speed

• less friction decreases speed

Tags

NGSS.MS-PS3-5

Force that opposes movement between touching surfaces

• Gravity

• Weight

• Friction

• Air Resistance

The force of friction between SURFACES NOT IN MOTION

• Static Friction

• Sliding Friction (Kinetic Friction)

• Rolling Friction

The force of friction that AFFECTS SURFACES IN MOTION

• Static Friction

• Sliding Friction (Kinetic Friction)

• Rolling Friction

The force that resists the start of sliding motion.

• Static Friction

• Kinetic Friction

• Contact Force

• Net Force