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19 Cards in this Set
- Front
- Back
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Assuming there are no external forces momentum is always... |
Conserved |
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Define an elastic collision |
When in a collision both momentum and kinetic energy are conserved |
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Define an inelastic collision |
When objects collide but some kinetic energy is converted into other forms |
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What is Newton's second law of motion? |
The rate of change of momentum of an object is directly proportional to the resultant force which acts on the object |
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What is impulse? |
Force multiplied by time |
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Impulse is what part of a force-time graph |
The area under it |
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Which way does the centripetal force act? |
Towards the centre of the circle |
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Define SHM |
An oscillation in which the acceleration of an object is directly proportional to its displacement from the midpoint, and is directed towards the midpoint |
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Resonance occurs when? |
The driving force approaches the natural frequency |
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What is resonance? |
When an oscillating system gains more and more energy from the driving force and so vibrates with an increasing amplitude |
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Gravitational potential is? |
The work done per unit mass to move a small object from infinity to that point |
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Gravitational potential energy is? |
The work done to move an object from infinity to that point |
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What is the electric field strength? |
At a point in an electric field, is the force per unit charge on a small positively charged object in the field |
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What is the electric field strength? |
At a point in an electric field, is the force per unit charge on a small positively charged object in the field |
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Define electric potential |
Is the work done per unit charge on a small positively charged object to move it from infinity to a point in the field |
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What is the electric potential difference? |
The energy needed to move a unit charge |
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What is faraday's law? |
The induced e.m.f. is directly proportional to the rate of change of flux linkage |
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What is faraday's law? |
The induced e.m.f. is directly proportional to the rate of change of flux linkage |
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What is lenz's law? |
The induced e.m.f. is always in such a direction as to oppose the change that it causes (motion of the conductor) |
