1G1 2.3 How Does Frictional Force Affect Us

Frictional forces acts between surfaces and ____ its motion.

• opposes

• helps

• stops

• smoothens

Which of the following are true about the red and green blocks?

As the ____ blocks have ____ friction, they travel a ____ distance

• red, less, longer

• red, greater, shorter

• green, less, longer

• green, greater, shorter

Which factors affect the size of the frictional force?

• texture of surface

• size of forces pressing against surfaces

• surface area in contact

Why is only a small push needed to move the object?

• There is more friction on the rough surface

• There is more friction on the smooth surface

• There is less friction on the rough surface

• There is less friction on the smooth surface

Why is only a small push needed to move the object?

• There is more friction on the rough surface

• There is more friction on the smooth surface

• There is less friction on the rough surface

• There is less friction on the smooth surface

A ____ surface produces ____ friction.

• smooth, more

• smooth, less

• rough, more

• rough, less

A heavier and a lighter box are pulled along the surface and the frictional force measured. Which statements are true?

• A heavy box presses on the ground with a greater force, so a smaller frictional force is experienced

• A heavy box presses on the ground with a greater force, so a greater frictional force is experienced

• A lighter box presses on the ground with a smaller force, so a smaller frictional force is experienced

• A lighter box presses on the ground with a smaller force, so a greater frictional force is experienced

The pencil marks are rubbed away by an eraser. The force that causes the pencil marks to be removed is called ___ force.

The pencil marks can be removed more quickly when the eraser is pushed ____ against the paper because this ____ the frictional force between eraser and paper.

• harder, decreases

• harder, increases

• softer, decreases

• softer, increases