-Push or pull
- a vector quantity with magnitude and direction
-Caused objects to speed up, slow down, or change direction
Force
Mass is the amount of matter and measure of inertia
-an object at rest will stay at rest
-an object in motion continues in a straight line in constant speed
(unless an external, unbalanced force acts on it)
First law
sum of all the forces acting on an object
Net Force
force that opposes moton
Friction
-never changes
-amount of matter
-exhibits inertia
-scalar
-kg
Mass
-force of gravity
-depends on the distance from the center of the earth
-force due to attraction of earth
-vector
-always down
-newton
Weight
a net force causes acceleration
(more force=more acceleration)
-the direction of the net force is the direction of the acceleration
-if the net force is negative, it opposes the motion (the object slows)
Second Law
when one object exerts a force on a second object, the second exerts a force on the first that is equal in magnitude but opposite in direction
Third Law
the capacity of an object to resist changes in motion
inertia