What do we need in order to be able to decide whether an object is in motion?

• motion
• reference point
• direction
• velocity

A complete description of your position includes which of the following (multiple):

• distance

• reference point

• speed

• direction

Constant speed means the object is:

• going the same speed each sec
• changing speed each sec
• a specific speed in an instant
• changing direction

Average speed is distance ___ time.

• multiplied by
• divided by
• added to
• subtracted from

Speed is a measure of the ____ an object travels per unit of time.

• position
• direction
• velocity
• distance

Velocity can change if which of the following change (multiple):

• speed

• distance

• direction

• both speed and direction

This type of force is an attraction between two objects:

• friction

• time

• gravity

• mass

What is defined as a push or pull?

• force

• energy

• motion

• speed

Jupiter has about 317 times more mass than Earth. What can you infer from this fact?

• Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.

• Jupiter’s and Earth’s gravitational forces are equal.

• Jupiter’s gravitational force is much stronger than Earth’s gravitational force.

• Mass has no effect on the gravitational force between two objects.

What force holds the planets in motion around the sun?

• Magnetic

• Gravitational

• Electrical

• Air Resistance