Space Reading Gravity

5.9 Gravity

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Orbit

the curved path of a celestial object or spacecraft around a star, planet, or moon

Multiple Choice

What causes orbiting?

• acceleration and distance
• gravity and forward motion
• free fall and gravity
• a push and a pull

Multiple Choice

 The circular motion of one object around another object in space is

• rotation
• inertia
• gravity
• revolution

Multiple Choice

Why do astronauts bounce and appear to float on the moon as they walk?

• There is no gravity on the moon
• Gravity is weaker on the moon
• Gravity is stronger on the moon
• None of these

Gravity is weaker on the moon

Multiple Choice

. An object's orbital path is a result of the balance between

• gravity and mass
• gravity and inertia
• mass and distance
• mass and inertia

Multiple Choice

What would happen to an object in orbit without gravity pulling down?

• It would crash into the object it is orbiting.
• It would continue to orbit
• it would stop its motion
• it would fly off into space

It would fly off in space

Without gravity pulling it down the planet would continue in it's forward motion (ineria)

Multiple Choice

An astronaut weighs _______________ on the moon than on Earth

• more 
• less
• double

Multiple Choice

 An astronaut's mass on the Moon and on Earth are ____________________.

• the same
• different

Multiple Choice

 The force of gravity on an object is the object's

• weight
• force
• mass
• inertia

Multiple Choice

 Which property of an object will be different on the Moon than on Earth?

• composition
• mass
• weight
• shape

Weight depends on gravity

So and objects weight can change, but its mass will stay the same.

Multiple Choice

What happens to gravitational force when the distance between objects increases?

• it gets weaker
• it gets stronger
• it gradually disappears
• nothing

Multiple Choice

 Which of these would affect the strength of gravity between the Earth and the Sun?

• The tilt of the Earth's axis
• The amount of energy the Earth receives from the Sun
• The movement of the magma inside of Earth
• The distance between the Earth and the Sun
  
  

Multiple Choice

 The pull of gravity on you would be _________________ on the moon.

• less
• the same
• more

Multiple Choice

As the masses of two objects increase, the gravitational force between them

• stays the same
• decreases
• increases

Multiple Choice

Two objects will have the greatest gravitational attraction when they are

• large and far apart.

• small and close together

• large and close together.

• small and far apart.

Multiple Choice

 Earth's gravity pulls everything towards the ________________.

• north
• south
• center
• all of these

Multiple Choice

Why don't people on Earth get pulled into the Sun?

• because we can't fly
• because the Earth is smaller than the sun
• because we are closer to the Earth than the sun
• because the sun is larger than the earth

Multiple Choice

If an object is placed halfway between the Earth and the Moon, the object will fall towards the

• Earth
• Moon
• Sun
• none of these

Multiple Choice

Who developed the Law of Universal Gravitation?

• Gossett
• Einstein
• Newton
• Galileo

Multiple Choice

 Anything that has _______________ has a gravitational pull.

• weight
• mass
• circular shape
• magnetism

Multiple Choice

If two planets moved three times further apart, their force of attraction would

• increase
• decrease
• stay the same

Multiple Choice

Why do a hammer and a feather fall at different rates on Earth?

• The hammer has more mass, so it falls faster.
• The feather is lighter, so it falls slower
  
• Air friction has a greater effect on the hammer
• Air friction has a greater effect on the feather.
  

Multiple Choice

All objects fall at the same rate when there is no air or atmosphere.

• True
• False

Multiple Choice

 Gravity is defined as

• a push or a pull
• a force of attraction
• a force that opposes motion
• the amount of mass an object has

​Gravity is a non contact force between 2 masses.

​​Gravity

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​The greater the mass of the 2 objects the greater the gravitational pull there will be.

​​Gravitational Pull

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1. Mass

2. Distance​

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​2 Things that affect Gravity are:

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​Every object attracts other objects.

Attraction

Gravitational force pulls all objects towards the center of the earth.​

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Gravitational Force

This is the amount of force required to accelerate a 1kg object at the rate of 1m/second/second.

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​Newtons

All objects accelerate at the same rate because of gravity. Mass doesn't matter here.

​Some text here about the topic of discussion.

​Accelerate

Multiple Choice

What is a force?

• up or down

• push or pull

• in or out

• left or right

Gravity is

a force of attraction between objects that is due to their MASSES and the DISTANCE between them.

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

Which two factors affect the strength of the gravitational pull on two objects?

• push and pull

• left and right

• mass and distance

• force and distance

Multiple Choice

A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.

• centripetal force

• orbit

• Law of Universal Gravitation

Planets in our solar system orbit the Sun because it -

is the celestial body with the greatest mass.

Some text here about the topic of discussion

Multiple Choice

Planets orbit the sun because it-

• is the celestial body.

• is the celestial body with the greatest distance.

• is the celestial body with the greatest mass.

Multiple Choice

Which celestial body has the greatest mass?