Simple Machines

A pulley is being used to move a load of bricks as shown in the picture. As a force is being applied to the rope by a person, in what direction will the load of bricks move?

• Outward

• Upward

• Inward

• Downward

In the diagram, a nail is being removed from a floor with the help of a crowbar. How does the crowbar change the task of removing the nail?

• It changes the direction and amount of force needed to pull the nail.

• It creates much more force by increasing the gravity on the nail.

• It increases the friction between the nail and the floor.

• It reduces the amount of air pushing downward on the nail.

It is easier to push a box up a ramp than to lift it directly from the floor. This solution is an example of what kind of simple machine making something easier?

• Wheel and axle

• Lever

• Inclined Plane

• Screw

The illustration shows the direction of a force applied to an object and the direction the object moves. This pair of forces best describes the use of which example of a simple machine?

• Ramp

• Hammer

• Nail

• Screw

• Level wheel and axle

• Screw and inclined plane

• Wedge and lever

• Wheel and axle

The force Earth exerts on objects on or near its surface

• Inclined plane

• Force

• Pulley

• Gravity

A flat, sloped surface

• Inclined plane

• Force

• Pulley

• Gravity

A push or pull

• Force

• pulley

• gravity

• simple machine

A device with few or no moving parts that helps you do work

• gravity

• inclined plane

• simple machine

• wedge

A grooved wheel with a rope around it

• force

• wedge

• inclined plane

• pulley