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13 Cards in this Set
- Front
- Back
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A scalar quantity |
Only has magnitude E.g temperature |
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A vector quantity |
Has both magnitude and direction E.g momentum |
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What is newtons first law |
An object will remain stationary or in a state of uniform unless a resultant force act on it |
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Newtons second law |
F=ma |
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Newton third law |
If a body A forces on body B then B exerts the same force on A in the opposite direction |
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Value of acceleration due to gravity |
9.81 ms-2 |
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Density = |
Mass ÷volume |
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Moment ? |
Force multiplied by the perpendicular distance from the pivot The unit is Nm |
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Principle om momentum |
If a system is in equilibrium the sum of anticlockwise moment is equal to the sum of the clockwise moments |
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Momentum = |
P = mv |
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Conservation of momentum |
The total momentum before a collision is equal to the momentum after collisions as long as there are no external forces acting |
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What is an elastic collision |
Kinetic energy is conserved |
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Define inelastic collisions |
Kinetic energy in conserved |
