c6 newton and forces

force

influence that changes motion of a body

friction

force that opposes motion when 2 objects come in contact with each other

1 newton

force required to move an object of mass 1kg by 1ms^-2

weight

force of gravity on an object

centre of mass

point where we say any force applied on object acts

centre of gravity

point where weight of a body may be considered to act

newtons 1st law

states an object will remain at rest or move at a constant velocity provided no external forces act on it

newtons 2nd law

states rate of change in momentum of a body is directly proportional to force applied to it and takes place in direction of force

newtons 3rd law

states when object a applies a force to object b object b exerts an equal and opposite force back

newtons law of universal gravitation

states the force of attraction between any 2 point masses in the universe is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

escape velocity

speed an object needs to escape from a celestial bodys gravity