Forces

Without forces...

• the Earth would continue to revolve around the Sun.

• nothing would move and nothing would change.

• plants would continue to grow in the wild.

• life as we know it would continue to exist.

When a basketball has force applied to it, what will NOT happen?

• it may continue to grow

• it may begin to move

• it may slow down or stop moving

• it may stay still

There is no net force acting on an object if the object:

• speeds up.

• slows down just a little bit.

• slows down and comes to a stop.

• remains at a constant speed in the same direction.

Which of the following is a contact force?

• Watching the Bunsen burner flame flicker.

• A magnet pulling a paper clip across your desk.

• Writing with your pen.

• Earth's gravity pulling you toward the centre of the Earth.

A magnetic field of a magnet is:

• constantly changing in strength.

• strongest at its poles.

• consistently strong through the entire magnet.

• weakest at both poles.

Rollers or balls can be used to ease the movement of objects along a surface as a result of reducing:

• friction.

• electrostatic force.

• non-contact force.

• magnetic force.

Ramps provide an advantage because they:

• decrease the effort required to move an object.

• move a load through a longer distance.

• increase the effort required to move an object.

• move a load through a smaller distance.

Which of the following is true of magnets?

• A north pole repels another north pole but attracts a south pole.

• A north pole repels another north pole and also repels a south pole.

• A north pole attracts another north pole but repels a south pole.

• A north pole attracts another north pole and also attracts a south pole.

What type of lever is the human forearm?

• fourth-class lever

• third-class lever

• first-class lever

• second-class lever

What is force?

• The involuntary movement of an object or an organism.

• A push or a pull acting upon an object as a result of its interaction with another object.

• A physical movement that can be seen or measured.

• An invisible field that makes objects accelerate (move faster).