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41 Cards in this Set
- Front
- Back
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Physical Quantities |
One that can be measured or calculated and expressed in numbers |
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Scalar quantity |
Only magnitude.no direction |
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3 scalar examples |
Area Speed Time |
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Distance |
How far one point is from the other. |
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Speed |
The distance travelled per unit time |
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Vector quantity |
Both magnitude and direction |
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3 vectors |
Displacement Velocity Force |
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Displacement |
Distance in a given distance |
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Velocity |
The rate of change of displacement with respect to time |
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Acceleration |
The rate of change of velocity with respect to time |
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Mass |
The measure of the amount of matter in a body |
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Momentum |
The product of mass and velocity |
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Principle of conservation of momentum |
The total momentum before an interaction is equal to the total momentum after, provided no resultant force acts on the system |
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Force |
That which can cause acceleration |
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Newton's 1st Law of Motion |
A body will remain at rest or continue moving at constantly velocity unless acted upon by an unbalancing external force. |
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Newton's 2nd Law of Motion |
The rate of change of momentum is proportional to the applied force and takes place in the direction of the force. |
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Newton's 3rd Law of Motion |
For every action there is an equal and opposite reaction and opposite reaction.action and reaction do not happen on the same body. |
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Newton's Law of Universal Gravitation |
The force of attraction between two point masses is proportional to the product of their masses and inversely proportional to the square of the distance between them. |
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Centre of gravity |
The point at which the whole weight of a body appears to act. |
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Friction |
A force that opposes the motion of a body. |
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Moment of force |
The force multiplied by the perpendicular distance to the fulcrum. |
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A fulcrum |
A fixed point about which a rigid body ( lever) is free to rotate. |
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Density |
Mass per unit volume (KG M-3) |
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Pressure |
Force per unit area |
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Pressure in liquid |
Pressure = density X g X depth |
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Buoyancy |
The upward force on a body that is wholly or partially immersed in a fluid |
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Archimedes' Principle |
When a body is wholly or partially immersed in a fluid,experiences an upthrust equal to the weight of the fluid displaced. |
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Law of Flotation |
The weight of a floating body is equal to the weight of the fluid it displaces . |
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Boyle's Law |
Pressure is inversely proportional to volume for a fixed mass of gas at constantly temperature |
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Angular velocity w omega |
The rate of change of angle. Radians per second |
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Linear velocity |
The speed of the particle in a direction perpendicular to the radius at that point. |
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Periodic Time |
The time taken for one complete revolution,cycle or oscillation |
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Centripetal Acceleration |
Is the acceleration an object travelling in uniform circular motion.it is directed towards the centre of the circle. |
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Centripetal Force |
The force required to maintain uniform circular motion. It is directed towards the centre of the circle. |
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Hooke's Law |
When an object is stretched, b entered or deformed the restoring force (F) is proportional to the displacement from its equilibrium position. |
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Elastic constant |
The constant of proportionality between the applied the force and the resulting displacement of a given spring. |
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Elasticity |
Is the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed. |
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Simple Harmonic Motion |
The acceleration of a body towards a particular points is proportional to its displacement from that point. |
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Amplitude |
The maximum distance that an object moves from its equilibrium position. |
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Frequency |
The number of cycles the object completes per unit time. |
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Period of a particle executing SHM |
The time taken for one complete |
