The unit of measure for force is _____________

• meters

• joules

• miles per hour

• newtons

Force is measured with a _________________

• barometer

• hygrometer

• spring scale

• meter stick

Work is done when .....

• a force is exerted on an object.

• an object exerts force onto another object.

• a force is exerted on an object causing the object to move.

• an object does not move.

True or False. When a force is applied to an object and it does not move then work was done.

• True

• False

A boy adds movable pulley to make a pulley system. What mechanical advantage does a movable pulley provide?

• it provides another wheel for the chain to sit on.

• it will change the direction faster than with 1 fixed pulley

• it will greatly reduce the force needed to lift the load

• it will cause the object to move in the same direction

Which model will require the least amount of force?

• pulley 1

• pulley 2

• pulley 3

• pulley 4

An ax head is a simple machine called a wedge. How can you make the cutting edge more efficient?

• make it longer

• make it shorter

• make sharper

• make it more rounded

_____________ are a sloping surface.

• pulleys

• inclined planes

• levers

• wheel and axles

_____________are made up of a grooved wheel with rope/chain running along the groove.

• ramp

• inclined plane

• pulley

• lever

A lever rotates on a fixed point called a _______________

• screw

• wheel

• ramp

• fulcrum