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12 Cards in this Set
- Front
- Back
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What is the equation for impulse? |
I= Ft. Force × time. Or I= mv-mu. Final momentum-initial momentum. Change in momentum. |
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What is the principle of conservation of momentum? |
The total momentum before an impact is equal to the total momentum after the impact. |
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What is the equation for work done and the equation for work done against gravity? |
Work done = force × distance. Work done against gravity = mgh. |
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How does work done relate to change in kinetic energy? |
Work done = change in kinetic energy. |
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When does the sum of a particles potential and kinetic energy always equal a constant? |
When no external forces apart from gravity act on the particle. |
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What are the two equations for power? |
Power = force × velocity. (Nms^-1) Power = energy ÷ time. (Js^-1) |
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What is hookes law? |
Extension of a string/spring is proportional to the tension in the string / spring. T=kx. |
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What is the hookes law constant dependent on? |
The modulus of elasticity (∆) and the unstretched length (l). K = ∆÷l. |
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What is the EPE in a string or spring equal to? |
The amount of work done to stretch the spring or string. |
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What is Newton's law of restitution? |
Speed of separation. -------------------------------- = e. Speed of approach e is the coefficient of restitution. |
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When a ball is colliding with a wall, what direction does momentum change and in what direction does it remain constant? |
Impulse acts perpendicularly to the wall there for mv perpendicular to the wall changes, mv parallel stays the same. |
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Where does the impulse act on two spheres colliding? |
The impulse acts along the line of centers. |
