Understanding Friction

What is the primary effect of friction when you rub your hands together?

• It creates light.

• It cools your hands down.

• It generates sound.

• It produces heat.

Which of the following is NOT an example of friction in everyday life?

• Walking on a sidewalk

• Sliding down a slide

• Floating in water

• Skateboarding

Why is zero friction practically impossible?

• Because surfaces are always perfectly smooth

• Because there is always some interaction between surfaces

• Because friction is not a real force

• Because objects cannot move without friction

What happens when two surfaces with irregularities come into contact?

• They create a vacuum

• They interlock and resist motion

• They become perfectly smooth

• They slide past each other without resistance

Which surface will produce the least amount of friction for a rolling ball?

• Sand

• Grass

• Road

• Metal

How does increasing the weight of an object affect the frictional force?

• It decreases the frictional force

• It has no effect on the frictional force

• It increases the frictional force

• It makes the surface smoother

What happens to a book on a table when no external force is applied?

• It slides off the table

• It spins in place

• It remains at rest

• It floats above the table

If you apply the same force to two books of different weights, what will happen?

• The heavier book will move further

• Both books will move the same distance

• The lighter book will move further

• Neither book will move

What is the relationship between friction and the force pressing two surfaces together?

• Friction is inversely proportional to the force

• Friction is unrelated to the force

• Friction is directly proportional to the force

• Friction decreases as the force increases

What is the effect of friction on the motion of an object?

• It makes the object move faster

• It resists the motion of the object

• It accelerates the object

• It has no effect on the object