5073540
Description
Flashcards by Sophie Cooper, updated more than 1 year ago
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Created by Sophie Cooper
over 8 years ago
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| Question | Answer |
| What is momentum | p=mv where p is in kgms-1 |
| What is the principle of linear momentum | (Assuming no external forces act) linear momentum is always conserved. total linear momentum before a collision= total linear momentum after a collision |
| What is an elastic collision? | Where momentum is conserved and kinetic energy is conserved |
| What is the equation for kinetic energy? | E=1/2mv^2 |
| What is an inelastic collision? | Kinetic energy before does not equal kinetic energy after. Linear momentum is still conserved however. |
| What is Newtons second law of motion? | F=ma where F is newtons, m is kg and a=ms-1 |
| What is newtons second law of motion in terms of momentum? | F= Δ(mv)/ Δt (the rate of change of momentum in kgms-1=resultant force) |
| What is impulse? | When you rearrange newtons second law it can give: FΔt=Δ(mv) - change in momentum in kgms-1 |
| How do you find impulse from a force time graph? | Impulse is the area under a force time graph |
| Energy transferred= | WORK DONE |
| What is an equation fro work done? | W=Fs where w=Joules F-Newtons s-Metres |
| What do you do when the direction of movement of an object is different from the direction of the force acting on it? | Find the component of the force that acts in the direction of the movement: W=FscosX where X =angel When X=90 no work is done |
| What is power? | The rate at which work is done/second P(W)= ΔW(J)/ΔT(s) |
| What is the watt(hahaha) defined as? | The rate of energy transfer = to Js-1 |
| How do you find the work done from a force displacement graph? | The area under the graph=work done |
| Derive an equation of Power using Force and Velocity | P=W/t W=Fs P=Fs/y V=s/t P=Fv |
| P=fv when the force and motion are in different directions | P=FvCosX where X=angle |
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