Quiz on Simple Machines and Gravity

Which class of lever has the fulcrum located between the effort and the load?

• Class 1

• Class 2

• Class 3

• Class 4

What type of pulley does not reduce the amount of effort, but changes the direction of force?

• Fixed pulley

• Movable pulley

• Compound pulley

• Inclined pulley

How does gravity change as the distance between two objects increases?

• Gravity increases

• Gravity decreases

• Gravity stays the same

• Gravity becomes stronger

Which of the following is a type of simple machine?

• Pulley

• Robot

• Engine

• Generator

What type of lever has the load in the middle between the effort and the fulcrum?

• Class 1

• Class 2

• Class 3

• Class 4

A movable pulley is best used when you need to:

• Increase the speed of lifting

• Decrease the effort needed to lift an object

• Change the direction of force

• Keep the force the same

Which of the following describes the effect of friction?

• It makes objects speed up.

• It opposes motion

• It causes objects to float.

• It increases weight.

What is the weight of a 5 kg object on Earth, where g = 9.8 m/s^2?

• 5 N

• 49 N

• 50 N

• 98 N

If the distance between two objects increases, what happens to the gravitational force between them?

• Increases

• Decreases

• Stays the same

• Doubles

On the Moon, a person’s weight is:

• The same as on Earth.

• Less than on Earth

• Greater than on Earth.

• Unaffected by gravity.