Ch 23 Force, work and energy

1. When a ball is dropped, it falls: Gravitational force:: When brake is applied, a car stops:

• a) Frictional force

• b) Gravitational force

• c) Muscular force

• d) Magnetic force

Give one word: A simple machine with a sloping surface, that allows us to lift or lower a load using less effort.

• a) inclined plane

• b) wedge

• c) lever

• d) wheel and axle

Give one word: The point on which the lever turns or balances.

• a) Load

• b) Pivot

• c) Effort

• d) Only option (a)

Give one word: A simple machine that is made up of an inclined plane wrapped around a narrow  
    cylinder.

• a) screw

• b) wedge

• c) wheel and axle

• d) lever

Answer in one word: A simple machine that is made up of two inclined planes joined together.

• a) wheel and axle

• b) wedge

• c) inclined plane

• d) screw

__________is neither created nor destroyed.

• a) energy

• b) force

• c) work

• d) friction

 
    A force between two surfaces that prevents those surfaces from sliding or slipping across each other is called _______.

One of these is an example of a lever.

• a) a pair of scissors

• b) the wheel of a car

• c) a clamp

• d) a slanted roof

One of these is an example of a screw.

• a) a tap

• b) a doorknob

• c) a knife

• d) a slanted roof

Choose the correct spelling

• a) wheel and axle

• b) wheel and axel

• c) wheel and excel

• d) wheil and axle