Grade 8 quiz 3

As the mass of an object increases, the pull of gravity

• Increases

• Decreases

• Stays the same

A force of attraction between objects that is due to their masses.

• Force
• Gravity
• Gravitational Pull
• Weight

If a feather and a hammer are dropped at the same time on the moon, where there is no atmosphere, which one will hit the ground first?

• neither, there is no gravity on the moon.

• hammer because it has more mass

• feather because it has less mass

• both will hit at the same time, there is no wind resistance

What does the strength of gravity between two objects depend upon?

• Mass & distance
• Mass & weight
• Gravity & inertia
• Inertia & mass

Earth's gravity, 9.8 m/s², is considered a/an...

• force

• weight

• acceleration

• mass

Mass is a measurement of 

• how much matter is present in an object
• how much weight is present in an object
• the amount a spring is compressed on a scale
• none of the answers are correct

What is Newton's Third Law of Motion?

• an object at rest stays at rest, and an object in motion will stay in motion until an outside force acts upon it

• the acceleration of an object will be equal to the net force of an object divided by its mass

• for every action, there will be an equal and opposite reaction

• an object that is not moving will stay not moving moving until an unbalanced force acts on it

When a small car pushes a big truck, the truck applies an equal and opposite force on the car.

• False

• True

Action reaction forces never cancel each other out because

• They act on different objects.

• They act on the same objects

• They do not act on objects.

If two people with the same mass collide, they experience the same amount of force.

• True

• False