Forces and Energy

Which force would you most likely use to kick a ball?

• twist

• push

• pull

• upthrust

As the mass of an object increases, the force needed to move it:

• decreases

• increases

• stay the same

• works

When the force makes an object move, we say:

• work is not done

• work could be done

• work is done

• work is absent

An example of a lubricant is:

• carpet

• sandpaper

• oil

• wood

Friction can be a useful force:

• when bobsleighing

• when skiing

• between parts in an engine

• when braking

Energy is defined as the ability to:

• do nothing

• move

• do work

• change direction

The heat energy from the Sun is transferred by:

• conduction

• friction

• radiation

• convection

Heat energy is transferred in a gas or a liquid by:

• conduction

• convection

• radiation

• friction

Work is done when you are doing all of the following examples EXCEPT?

• girl dancing ballet

• children skipping

• a tractor being pulled

• playing baseball

Knowing that friction is a force that slows you down, you would...

• choose a pair of sneakers with smooth soles to run a race.

• tell your parents NOT to change their smooth tyres if they want to be able to get somewhere in a hurry.

• advice someone to choose a boat that has the most tapered front to enter a boat race.

• leave your parachute behind if you had to jump from a plane that was about to crash.