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Force and momentum

Physics

QuestionAnswer
Scalar quantity has a magnitude- no direction
Vector quantity has both magnitude and direction
Displacement Distance moved in a particular direction. Unit: m
Velocity rate of change of displacement with time. An object has constant velocity if it does not speed up or change direction. Unit m/s
Acceleration Rate of change of velocity with time. Unit m/s^2
Force Anything that makes an object move or change velocity
Newtons 1st Law All body's will remain at rest or constant velocity unless an external force acts on them
Newton's 2nd Law The rate of change of a bodys momentum is poorportional to the net force applied and will act in the direction of the force.
Newton's 3rd Law every action has an opposite but equal reaction.
Newtons law of universal gravitation Every mass in the universe attracts every other mass with a force, along the line of their centers, that is proportional to the product of their masses and inversely proportional to the square of the distances between them.
Principle of conservation of momentum The total momentum of a system before an interaction is equal to the total momentum of a system after an interaction, so lng as no external force acts on it.
Created by: Peter0
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