Concept 4.1

If there is no Earth's gravity, the moon would

• revolve faster around Earth

• still orbit Earth

• attract to Earth

• float off into space

Magnetism is a kind of ..………….force.

• attraction only

• repulsion only

• Invisible

• Visible

Which of the following examples shows the effect of gravity clearly?

• A paper clip moves toward a magnet.

• A ball slows down while rolling on the ground.

• A car speeds up on a road.

• A ball falls down toward the ground.

When a basketball falls down from a height, it is affected by .……

• air resistance force only.

• gravity force only.

• air resistance and gravity force.

• air resistance and electric force.

The planets revolve around the Sun in fixed orbits.

• Oval

• Rectangular

• Circle

• Triangular

Write scientific term

The force by which metals are attracted or pulled to a magnet.

Write scientific term

A force that opposes the motion of a body across a solid surface or through a

gas or liquid

A type of friction force that opposes the movement of an object as

it passes through air.

Write scientific term

The effect that pulls or pushes an object to make it moves.

Force is the reason of motion of any body.

• True

• False