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Gr 11 Physics
Definitions
Term | Definition |
---|---|
The vector sum of two or more vectors | Resultant vector |
The force or the component of a force which a surface exerts on an object in contact with it, and which is perpendicular to the surface | Normal force |
The force that opposes the motion of an object and which acts parallel to the surface | Frictional force |
The force that opposes the tendency of motion of a stationary object relative to a surface | Static frictional force |
The force that opposes the motion of a moving object relative to a surface | Kinetic frictional force |
A body will remain in its state of rest or motion at constant velocity unless a non-zero resultant/net force acts on it | Newton's first law of motion |
When a resultant/net force acts on an object, the object will accelerate in the direction of the force at an acceleration directly proportional to the force and inversely proportional to the mass of the object | Newton's second law of motion |
When object A exerts a force on object B, object B SIMULTANEOUSLY exerts an oppositely directed force of equal magnitude on object A | Newton's third law of motion |
Each particle in the universe attracts every other particle with a gravitational force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres | Newton's Law of Universal Gravitation |
The resistance of an object to any change in its state of motion | Inertia |
The gravitational force, in newton (N), exerted by the Earth on an object | Weight |
A physical quantity that has magnitude only | Scalar |
A physical quantity that has magnitude and direction | Vector |
The length of path travelled | Distance |
A change in position | Displacement |
The rate of change of distance | Speed |
The rate of change of displacement | Velocity |
The rate of change of velocity | Acceleration |