forces 5a defintions ( contact non contact work done scalar vector power resultant )

a force is

a push or pull that acts on a object due to interaction with another object

measured in Newtons

a scalar quantity + examples

magnitude - size only

speed distance time mass

a vector quantity + examples

magnitude and direction

force momentum acceleration displacement

a contact force + examples

a force, that acts when two interacting objects are touching

normal contact, tension, friction , air resistance ,,water resistance

a non contact force + examples

a non contact force is a force that acts when the two interacting objects don`t have to be touching

gravity,elastic,electrostatic,magnetic

basics of newtons third law

when two forces equal size but opposite directions act on the two objects interacting

resultant force is

overall force acting on a object

weight is

force acting on a object due to gravity

mass is

amount of matter in a object

weight and mass are

directly proportional

weight mass gravitational field strength equation

weight = mass kg x gravitational N/kg

earth gravitational field strength /moon

9.8 N kg / 1.6 N kg

work is done when

a force moves a object through a distance transferring energy

work done force distance equation

work done joules = force x distance

if all objects forces are balanced resultant force = 0 that means the object is at

equillibrium

the object will be moving/not moving at resultant of 0

if object has resultant 0 it will either be stationary or moving at constant speed