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Force
A push or a pull
Net Force
The combination of all forces acting on an object
Newton's First Law
An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force.
Inertia
Resistance of an object to a change in its motion
Inertia is based on
mass
Vector
a quantity that has both size and direction
matter
Anything that has mass and takes up space
mass
A measure of how much matter is in an object
gravity
the force of attraction between any two objects that depends on the masses of the objects and the distance between them.
weight
A measure of the force of gravity on an object.
If I went to the moon, my _________ WILL CHANGE
weight
If I went to the moon, my ________ WILL NOT CHANGE
mass
Mass does not change because
no matter where you travel, you will always take up the same amount of space
Weight does change because
it depends on gravity which will change with smaller masses, such as the moon.
balanced force
Forces on an object that do not change the motion of the object
unbalanced force
Forces that do not cancel each other out and that cause an object to change its motion.
Balanced forces cause
1. no motion
2. constant motion
Unbalanced forces cause
1. acceleration (a change in motion)
Friction
A force that resists motion between two surfaces that are in contact.
Why doesn't the statement, "an object in motion will remain in motion" ever demonstrate itself on Earth
Because on Earth there are always going to be unbalanced forces that act on objects to slow them down to a stop. The two biggies are friction and gravity
Newton's laws of motion were based on thought experiments by
Galileo
The moon is approximately __________ the size of the Earth
1/6th - which is why you would weigh 1/6 of the amount you do on Earth. ex. a 120 lb person on Earth, would weigh 20 lbs on the Moon.
