Gravity The force that pulls objects towards each other – a force of attraction between objects!...
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Transcript of Gravity The force that pulls objects towards each other – a force of attraction between objects!...
GravityThe force that pulls objects towards
each other – a force of attraction between objects!
On Earth, gravity is pulling everything straight down toward the center of the Earth (of course we get stopped by the ground)
WeightWeight is the force of gravity on a
person or object on the surface of a planet
Weight depends on mass and the force of gravity at a specific location
MassThe measurement of the amount of matter “stuff” in an object
InertiaThe tendency of an object to resist a change in its motion
Mass changes an object’s inertia – the more mass the more inertia… the object will be harder to start or stop
ForceA push or a pull between objects
The Universal Law of GravitationThe force of gravity acts between all
objects in the universe. This means that all objects attract
each other!
Factors Affecting GravityMass – the greater the mass the greater the gravitational force
Distance – the smaller the distance, the greater the gravitational force
The Earth and youYou are attracted to the Earth and
the Earth is attracted to youYou pull on the Earth and the Earth
pulls on you… with the same amount of force!
FallingWhy when we fall are we pulled
down towards the Earth instead of pulling the Earth up towards us?
The Earth has a whole lot more mass (more inertia) – needs more force to move!
Why are we pulled more towards the Earth than the moon?The Earth has more mass and is closer to us!
Mass and Weight on the MoonYour mass will not change on the
moon Your weight will decrease since
there is less gravity on the moonThere is less gravity on the moon
because the moon is less massive than the Earth
Weight on other planetsGravity on the other planets
depends on the mass of the planet and the radius of the planet