2.3 Lesson: Gravity and the third law

The Moon's gravitational pull on the Earth is ____________ the Earth's gravitational pull on the Moon.

• Less than

• equal to

• greater than

A butterfly is flying about on a summer's day. It exerts a gravitational pull on the Earth that has exactly the same strength as the gravitational pull that the Earth exerts on the butterfly.

• True

• False

Tags

NGSS.MS-PS2-4

Net forces of the same magnitude _________ have the same effect.

• Always

• Don't Always

Tags

NGSS.HS-PS2-1

A net force has _____________ effect on an object with high mass, and _____________ effect on objects with low mass.

• more, more

• more, less

• the same, the same

• less, more

• less, less

Tags

NGSS.MS-PS2-2

A fly hits the windscreen of a moving car. In this collision, how did the size of the force on the fly compare to the size of the force on the car?

The force that the car applied to the fly was ____________ the force that the fly applied to the car.

• greater than

• equal to

• less than

Tags

NGSS.MS-PS2-1

Giant magnets can be used to lift cars.

The force that the magnet applies to the car is ____________ the force that the car applies to the magnet.

• greater than

• equal to

• less than

Tags

NGSS.MS-PS2-1

Your body exerts the same amount of gravitational force on the Earth as the Earth exerts on your body.

• True

• False

Tags

NGSS.MS-PS2-4

The Earth has a gravitational pull on a single nitrogen molecule (N₂) in the air. In comparison, the gravitational pull of the nitrogen molecule on the Earth is:

• weaker, but not zero

• stronger

• zero

• the same size

Tags

NGSS.MS-PS2-4

Newtons law states that for every action, there is an_________ reaction

• unequal and opposite

• stronger and opposite

• equal and similar

• equal and opposite

Tags

NGSS.MS-PS2-1

Which law is this: Every force has an equal and opposite reaction force.

• Newtons First Law

• Newtons Second Law

• Newtons Third Law

Tags

NGSS.MS-PS2-1