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

A doorknob is an example of a _______.

• wheel and axle

• inclined plane

• pulley

• wedge

An example of a lever is a ________.

• doorstop

• drill

• staircase

• hammer

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

• wheel.

• fulcrum.

• input force.

• output force.

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

• inclined plane

• fulcrum

• force

• lever

A doorknob is a simple machine made up of 2 circular objects of different sizes. When turning a doorknob, what type of simple machine is being used?

• inclined plane

• wheel and axle

• wedge

• pulley

Using the back of a hammer makes it much easier to remove a nail from a wooden board. What type of lever would the hammer be classified as if you are using it for this purpose?

• No Class

• 1st Class

• 2nd Class

• 3rd Class

Which of the following is NOT one of the things a machine can do?

• Changes the amount of force required.

• Changes the distance over which the force is exerted.

• Changes the direction of the force.

• Changes the amount of work done.

Workers push a heavy box up an inclined plane and onto a moving truck. Which best explains why these workers use an inclined plane?

• It makes their work easier because it requires less effort.

• It decreases the amount of work they have to do.

• It increases the amount of friction necessary to do the task.

• It makes the box weigh less.