The time to complete one rotation or revolution is called

• period

• frequency

• orbit

• quantum

Two planets attract each other with a force of 100 N. If the distance between them is HALVED, what will be the new force of gravity?

• 25 N

• 50 N

• 200 N

• 400 N

Which of the following exerts the strongest gravitational force on you, right now?

• The Sun

• The Earth

• The Moon

• Jupiter

As two objects move farther away from each other, the gravitational force between them

• increases

• decreases

• stays the same

• it depends on the masses

Astronauts in orbit around the Earth appear weightless because

• the Moon's gravity cancels out the Earth's gravity

• they are above the atmosphere

• they are far enough from the Earth where gravity does not affect them

• they are falling

If the mass of the Earth doubled (but its radius remained the same), how would this effect the force of gravity on you?

• It would cut in half

• It would also double

• It would quadruple

• It would be unchanged

The Earth and the Moon gravitationally attract each other. Which exerts the greater force on the other?

• The Earth exerts a greater force on the Moon

• The Moon exerts a greater force on the Earth

• They exert the same force on each other

• Depends on the phase of the Moon

Which of the following is an example of speed

• A car moving

• A car going 20 mph south

• A cat running 5 mph

• A cat running 5 mph north

Which of the following is an example of velocity?

• A car moving 15 mph

• A horse running 5 mph

• A horse running 5 mph south

• A cat running

What does it mean when you move things away from you?

• Push

• Pull

• Work