M3- C7 Flashcards
Newton’s first law of motion
An object will remain at rest or continue to one with constant velocity unless acted upon by a resultant force
It is a vector quantity
Newton’s third law of motion
When two object interact, they exert equal and opposite forces on each other
4 fundamental forces
Gravitational
Electromagnetic
Strong nuclear
Weak nuclear
Momentum
Mass X Velocity
Kgms^-1
Vector quantity
Closed system
An isolated system that has no interaction with the surrounding
Principle of conservation of momentum
Within a closed system The total momentum in a specified direction remains constant, as long as no external forces act on the system
Perfectly elastic
A collision in which no kinetic energy is lost
Inelastic
A collision where kinetic energy is lost
Newton’s second law
The net (resultant) force acting on an object is directly proportional to the rate of change of its momentum, and is in the same direction
Force equation
F= kp/t K= 1 due to setting the whole equation to 1 So F= p/t F= (mv - mu)/ t F= m X (v-u) t F=ma
Impulse
The product of force and the time for which the force acts
Area under force time graph
Equal to change in momentum
Ns or Kgms^-1
Conservation of momentum
Linear momentum is conserved in all directions
Use a vector triangle to work it out
