Gravity 7th

Gravity & Motion
What Determines Gravity?
What Keeps Objects in Orbit?

Anthony Kaltenbach

Word Cloud

Use a word to describe gravity!

A force of attractions between objects due to their mass!

Gravity!

Every object in the universe attracts every other object.

Newton's law of universal gravitation!

Multiple Choice

Who authored the law of universal gravitation?

• Isaac Newton

• Albert Einstein

• Spongebob Squarepants

• Marie Curie

Mass is the total inertia of an object. (How much stuff is in an object.) While weight is the measure of the force of gravity.

Mass vs. Weight!

Drag and Drop

Mass tells us how much ​

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an object has while ​

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tells us about the force of gravity acting on an object.

Drag these tiles and drop them in the correct blank above

inertia

weight

volume

density

mass

Distance & Mass

What determines the strength of Gravity?

Multiple Choice

When 2 objects move closer together...

• the strength of gravity increases!

• gravity decreases!

• nothing changes!

• their mass increases

Multiple Choice

The more mass an object has...

• the more gravity it has.

• the more density it has.

• the less gravity is has.

• the more transparent it becomes.

Newton concluded that inertia & gravity combine to keep objects in orbit.

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Objects in Orbit!

This is a tendency of an object to keep doing what it is doing. If it's in motion--to stay in motion. If it's sitting still--to stay sitting still.

Inertia

An object at rest or an object in motion will stay at rest or in motion (at a continuous speed & direction) unless acted upon by an unbalanced force.

Law of Inertia- Newton's 1st law of motion!

Multiple Choice

Will throwing a ball to friend ever change direction or speed?

• Yes, because air resistance and gravity are outside forces that slow it down & change its direction.

• No, because Newton's law tells us that it will not change.

• It will only speed up.

• It will just keep going forever.

Multiple Choice

Newton's first law of motion states:

• Objects at rest or in motion will continue that state until something interacts with them.

• Everything is static and doesn't move.

• All objects have mass.

• Everything is moving, all the time.

Multiple Choice

The force that causes objects with mass to attract to one another:

• Weight

• Mass

• Gravity

• Magnetism

Multiple Choice

Gravity can be defined as the –

• force of attraction between two or more masses.

• friction created when two objects are in contact.

• energy given off by stars due to nuclear reactions.

• path an object follows as it moves through space.

Multiple Choice

As distance between two objects increases, the pull of gravity 

• Increase

• decrease

• stays the same

• has not effect

Multiple Choice

Which of the following will NOT change in different gravities?

• Weight

• force

• mass

• pounds

Multiple Choice

Why are we attracted to Earth's center and NOT the sun's?

• The sun is very LARGE

• The sun is very FAR AWAY

• Earth has a STRONGER GRAVITY than the sun

• Earth ORBITS around the sun

Multiple Choice

Two factors affecting the magnitude of the force of gravity between 2 objects are...

• weight and mass.

• distance and weight.

• mass and matter.

• mass and distance.

Multiple Choice

Which has more mass, Earth or the Moon?

• Earth
• Moon
• The same

Multiple Choice

What is gravity?

• A force
• Energy
• A push
• All of them

Multiple Choice

Which system has the greater gravitational attraction between the two objects (if any)?

• System A
• System B
• Same gravitational attraction fro System A and System B

Multiple Choice

The force of gravity is also known as

• Mass
• Weight
• Distance
• Acceleration

Multiple Choice

A measure of gravitational force on an object.

• gravity
• weight
• mass
• kilograms

Multiple Choice

Which System has the greater gravitational pull between the two objects?

• System 1
• System 2
• Same: there is no gravitational attraction between the two objects