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# Physics chapter 1

### force and momentum

TermDefinition
equation for momentum (vector - has direction) momentum(p) = mass(kg) x velocity(m.s-1) (in Ns)
Newtons 1st law remain at rest or uniform motion unless acted on by a force
Newtons 2nd law rate of change of momentum of an object is proportional to the resultant force on it
equation for change in momentum/impulse Force(N) x time(s) = mv(final) - mu(initial)
Areas under a force/time graph impulse (Ns)
elastic collision no loss of kinetic energy, or momentum
inelastic collision kinetic energy is transferred to energy in other forms, momentum conserved
Impluse (Ns) magnitude of a force multiplied by the time it takes to act
vector magnitude and direction
scalar only magnitude
gradient of displacement/time graph velocity (rate of change of displacement)
gradient of velocity/time graph acceleration (rate of change of velocity)
resultant force equation F(N) = mass(kg) x acceleration(m.s-2)
equation for work done Work = Force(N) x distance(m) (in Nm)
power rate of change of energy
equation for kinetic energy 1/2 x mass x velocity ^2 (in J)
equation for potential energy mass(kg) x g x change in h (in J)
Newtons 3rd Law when objects interact they exert equal and opposite forces on each other
Principle of Conservation of Momentum for a system, the total momentum remains constant, provided no external forces
How do you work out a Force at an angle to the direction of the force? when in a parallel component = Fcosθ when in perpendicular component = Fsinθ
Created by: larasansun