Forces & Simple Machines Revision

A push or pull is a ___________________.

• work

• force

• pulley

• load

___________________ pulls objects toward the center of the Earth.

• Gravity

• Work

• Force

• Load

Which of the following is the best definition of friction?

• A force which opposes gravity

• A force which opposes motion of one body across another

• The force acting on a body depending upon its mass

• A force which stops a body sliding down a slope

True or False...

There is friction when two objects are NOT in contact.

• True

• False

Which of the following is NOT an example of where friction is helpful?

• A nail file

• Teeth on a saw

• Pistons moving up and down in a car engine

• Tread on shoes

A substance that is used to reduce friction is known as:

• a lubricant

• a tyre

• an engine

• a brake

A device which enables us to do work more easily is a:

• force.

• machine.

• complex.

• thought.

A dinosaur has a mouthful of ________.

• Wedges

• Levers

• Inclined planes

• Screws

The force you need to move an object is called the:

• frictional force.

• effort.

• load.

• resistance.

A ____________ is made of two or more simple machines.

• Load

• Simple machine

• Wedge

• Compound machine