physics definitions 2

linear motion

motion in a straight line

speed,v

rate of change of distance

velocity,v

rate of change of displacement

acceleration

rate of change of velocity

free fall motion

a situation where an object falls down due to gravitational force only

inertia

tendency of an object to remain at rest or to continue its uniform motion in a straight line at uniform velocity

Newton’s first law of motion

an object will remain at rest or move at uniform velocity unless acted upon by an external force

momentum,p

a product of mass multiplies by velocity

force,F

the action of pushing or pulling to change the size and direction of motion of an object

Newton’s second law of motion

rate of change of momentum is directly proportional to the force and acts in the direction of the applied force

impulse,J

change of momentum

impulsive force,F

rate of change of momentum in a collision or impact in a short period of time

Newton’s third law of motion

for every action there is a reaction of equal magnitude but in the opposite direction

weight,W

a gravitational force acting on an object