Understanding Simple Machines: Screws and Pulleys

What is one of the main purposes of simple machines?

• To make objects more colorful

• To make objects heavier

• To allow humans to lift heavier objects

• To reduce the size of objects

Which of the following is a common use of screws in everyday life?

• To measure distances

• To hold things together

• To paint walls

• To cut wood

How does a screw jack lift heavy objects?

• By using a magnetic field

• By inflating a balloon

• By spinning a screw to raise a platform

• By using a hydraulic system

What is the primary function of a pulley?

• To compress materials

• To rotate objects

• To lift heavier loads than possible by hand

• To push objects forward

How can the lifting capacity of a pulley system be increased?

• By using a thicker chain

• By adding more pulleys

• By using a longer rope

• By reducing the weight of the object