Gravity and Inertia

Which of these can cause a moving object to change direction?

• inertia

• force

• mass

Tags

NGSS.MS-PS2-2

What is gravitational force?

• the force of attraction between any two objects

• the force that makes inert objects start moving

• the only force that changes an object’s velocity

Tags

NGSS.MS-PS2-4

Where is an object’s center of gravity?

• the part that is closest to the Earth

• the exact center of its mass

• all of the above

A paperclip and a computer are sitting on your desk. What is true about the gravitational force of these two objects?

• The computer attracts the paperclip with less gravitational force than the paperclip attracts the computer.

• There is no gravitational force between the paperclip and the computer.

• The computer and the paperclip attract each other with equal gravitational force.

Tags

NGSS.MS-PS2-4

Why don’t we see the ground coming toward us?

• We have less mass than the Earth.

• We are already standing on the Earth.

• We have more inertia than the Earth.

Tags

NGSS.MS-PS2-4

Why doesn’t the moon crash toward the Earth’s surface?

• It has more mass than the Earth, so it stays in one place while the Earth orbits it.

• It has a lot of mass, so it feels the Earth’s gravitational force less than smaller objects do.

• It is too small to fall through the Earth’s atmosphere and reach the Earth’s surface.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Why is it impossible to “defy gravity”?

• Nothing has enough force to resist gravity.

• You can’t defy gravity without going to another planet.

• Gravitational force exists every place where there are two objects.

Tags

NGSS.MS-PS2-4

The force that pulls things down to the surface of the Earth and keeps them from floating away into space.

• force

• gravity

• net force

• inertia

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

any action that change the shape or movement of an object.

• force

• inertia

• gravitational force

• gravity

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The total of all forces acting on an object.

• force

• net force

• inertia

• gravity

Tags

NGSS.MS-PS2-2