4.1 simple machines

Which three are kinds of simple machines?

• car
• Wheel and axle
• Screw
• flag pole
• Wedge

A rigid bar that is free to pivot on a fixed point.

• wedge

• wheel and axle

• screw

• lever

On a ____________________ lever, the fulcrum is located between the effort and the load.

• 1st class

• 2nd class

• 3rd class

A shovel is an example of a _____ ______ lever

• 1st class

• 2nd class

• 3rd class

•Reduces the force needed to move an object by increasing the distance moved

• screw

• incline plane

• wheel and axle

•A grooved wheel with a rope, chain, or cable wrapped around it

• wheel and axle

• screw

• pulley

•An inclined plane wrapped around a cylinder

• wheel and axle

• screw

• pulley

•_______________ pulley – attached to an object you want to move; requires less effort to move a load (ex. elevators)

• fixed

• Movable

• compound

Which is an example of a fixed pulley?

• elevator

• construction crane

• flagpole

An axe is an example of an __________.

• incline plane

• lever

• wedge