Newton's First Law (law of inertia)
the state of motion of an object does not change as long as the net force acting on the object is zero
the tendency of an object to resist a change in its motion
ex: an object in rest tends to remain in rest, and an object in motion tends to stay in motion
the measure of the inertia of an object and depends on the amount of matter the object contains
Newton's Second Law
the acceleration of an object is equal to the net force acting on it divided by the object's mass (a=F/m) N/kg = m/s2
the force of gravity acting on an object, and is the product of the object's mass and acceleration due to gravity (W=mg) (g= 9.8 m/s2)
Mass vs. Weight
Mass is a measure of the inertia of an object; weight is a measure of the force of gravity acting on an object.
Newton's Third Law
Whenever one object exerts afford on a second object, the second object exerts an equal and opposite force on on the first object, and don't balance
force exerted by second object
force exerted by first object
the product of an object's mass and its velocity
Momentum= mass X velocity
Mass vs. Velocity in Momentum
An object has a large momentum if the product of its mass and velocity is large.
law of conservation of momentum
if no net force acts on a system, then the total momentum of the system does not change
In a Closed System
In a closed system, the loss of momentum of one object equals the gain in momentum of another object momentum is conserved.
one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object