Force, mass and momentum
Force
anything that causes the velocity to change
friction, gravity etc
unit is newton
acceleration is directly proportional to the force applied
a porportional to 1/mass
mass
the measure of how difficult is is to accelerate that body
measured in kilograms
1 newton is the force that gives a mass of 1 kg 1 m/s(Sq)
F = ma
weight = the force of earth's gravity acting on an object
Momentum
momentum = mass x velocity //// p =mv
unit is kilogram m/s
Newtons laws of Motion
law 1: every body will remain in state of rest or travelling with constant velocity unless unbalanced external force acts on it
Law 2: when an unbalanced force acts on a body the rate of change of the body's momentum is directly proportional to the force an takes place in direction of force
Law 3: if a body A exerts a force on body B then body B exerts an equal but opposite force on body A
F = mv - mu all over t
a = v-u all over t
f=ma
Conservation of Momentum
any interaction between two or more bodies the total momentum of the bodies before the interaction is equal to total momentum after the interaction
1(mu) + 2(mu) = 1(mv) + 2(mv)