Forces of the Earth Guided Notes Gravity Inertia

Gravity 1. The pulling force that attracts objects Pulls things down on Earth

Gravity 2. Every object has gravity Gravitational force pulls from each object’s center of

Gravity Click for demo 4. When two objects attract, they pull with the same

Gravity What does gravity do? 1. Holds planets in paths around sun Click here

Gravity What does gravity do? 2. Keeps the moon in its orbit around the

Gravity What does gravity do? 3. Keeps the entire universe moving in an orderly

Why does your weight change but your mass stays the same when on the

Inertia At “rest” 1. Every object in the universe is moving ! Because the

Inertia Click car below 2. Newton’s First Law of Motion: A body in motion

Inertia 3. Every object tries to stay the way it is Either moving or

Inertia 4. The greater the mass of an object, the greater its inertia –

Inertia What does inertia cause in space? 1. It causes the Moon to keep

Inertia What does inertia cause in space? 3. It causes galaxies to keep moving

Start and Stop To overcome inertia, you have to apply Force Either a push

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Forces of the Earth: Guided Notes Gravity & Inertia

Science Court…

A C C D D B A B B C E

Gravity 1. The pulling force that attracts objects Pulls things down on Earth

Gravity 2. Every object has gravity Gravitational force pulls from each object’s center of gravity (the exact center of its mass) 3. The strength depends on mass & distance between objects

Gravity Click for demo 4. When two objects attract, they pull with the same gravitational force

Gravity What does gravity do? 1. Holds planets in paths around sun Click here to watch astronauts in zero gravity!

Gravity What does gravity do? 2. Keeps the moon in its orbit around the Earth

Gravity What does gravity do? 3. Keeps the entire universe moving in an orderly way Click for Mr. Parr’s Law of Gravity Song

Why does your weight change but your mass stays the same when on the Moon (or any other planet)? Answer: Another way of putting this is, your weight is your mass multiplied by the gravitational pull: Weight = Mass x Gravitational Pull

Inertia At “rest” 1. Every object in the universe is moving ! Because the earth is moving Until an outside force moves it Gravity pulls coin down

Inertia Click car below 2. Newton’s First Law of Motion: A body in motion stays in motion, a body at rest stays at rest, unless acted on by an outside force

Inertia 3. Every object tries to stay the way it is Either moving or resting

Inertia 4. The greater the mass of an object, the greater its inertia – The harder it is to start or stop

Inertia What does inertia cause in space? 1. It causes the Moon to keep moving around Earth 2. It causes Planets to keep orbiting the sun

Inertia What does inertia cause in space? 3. It causes galaxies to keep moving through You are space here

Start and Stop To overcome inertia, you have to apply Force Either a push or a pull Objects slow down because of friction Friction is the force that holds back the movements of a sliding object The force acts in the opposite direction to the way an object wants to slide

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