physics key words&concepts
what is meant by momentum?
a quantity relating to a moving object calculated by mass x velocity
what is meant by velocity
the speed of an object in a particular direction
what is the difference between speed and velocity?
velocity has a direction whereas speed does not
what is acceleration?
the rate at which a velocity increases over time
what is the unit for energy?
joules (J)
what is newtons first law?
an object will remain at rest or moving at a constant velocity unless acted upon by external forces, meaning that if all forces acting on an object are balanced the object will not change its state if motion
what is newtons second law?
the acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. force = mass x acceleration
what is newton's third law?
when 2 objects interact they exert equal and opposite forces on each other. "for every action there is an equal and opposite reaction"
what is the unit for forces
newtons
what is the unit for power
watts