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2.2 Motion and Forces - Coggle Diagram
2.2 Motion and Forces
Newton's Laws
Second Law
The acceleration of an object is directly proportional to the resultant force acting on it
F = ma
Inertial mass
How difficult it is to change object's velocity
F = mΔv / t
Force = change in momentum / t
First Law
Velocity of an object only changes if there is a resultant force
If resultant force = 0
Object is stationary
Object moving at constant velocity
Third Law
The forces on interacting objects are equal and opposite
Momentum
Conservation
Total momentum before event = total momentum after event
Assuming no other external forces
m₁v₁ = m₂v₂
Momentum = mass x velocity
Measured in kgm/s
Collisions
Force = rate of change of momentum
Seat belts
More time to change momentum
Smaller rate of change of momentum
Lower force
Circular Motion
Centripetal Force
Acts towards centre of circle
Causes acceleration that changes velocity
Velocity
Speed
Stays constant
Constantly changing