simple machines

________________ is done whenever a force moves an object a distance.

• Load

• Friction

• Force

• Work

How can simple machines make work easier?

• by decreasing the force needed to complete the task

• by increasing the friction between the machine and the object

• by adding more work on the object than originally applied

• by removing the force of gravity on the object

Simple machines can make work easier by reducing the input force needed to move an object. However, there is a trade off for decreased input. What is the trade off?

• The distance the object is moved is increased.

• The distance the object is moved is decreased.

• The amount of work is increased.

• The amount of work is decreased.

A doorknob is an example of a _______.

• wheel and axle

• inclined plane

• pulley

• wedge

Which type simple machine would the base of a light bulb be?

• screw
• wedge
• wheel and axle
• pulley

The fixed point around which a lever rotates is know as the

• wheel.

• fulcrum.

• input force.

• output force.

A simple machine that splits an object apart is a _______.

• inclined plane

• fulcrum

• wedge

• lever

A ramp is an example of a(n) _______.

• inclined plane

• fulcrum

• force

• lever

Which simple machine would be the MOST efficient for lifting an object 30 meters off the ground?

• pulley

• screw

• wedge

• lever

The bow or front of a boat splits the water as the boat moves. What kind of simple machine would the bow of the boat be?

• wedge

• screw

• ramp

• lever