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Motion

on May 14, 2011

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MotionPresentation Transcript

• Graphs for constant velocity Velocities add up as Resultant force is the result of adding up all the vectors forces. Eg 10N to the left and 8N to the right is 3 + 4 = 5 m/s the same as 2N to the left.Speed= distance Gradient (slope) = speed A projectile takes the Weight = mass x gravitational field strength Time same time to fall as an object dropped vertically If the resultant is zero then all the forcesAccel= change in vel – it follows a parabolic balance, so the object will either stay at rest time path. or continue at constant velocity eg terminal Can use equation velocity for a sky diver. Gradient = acceleration S = ut + 1/2 at2 Area = distance travelled forces If there is a resultant force then the object will accelerate Speed, velocity andThinking distance = speed x given by:reaction time acceleration force = mass x accelerationStopping distance = thinkingdistance + braking distance. Motion Momentum = mass x velocity Measured in kgm/s, is a vector Work done = energy Force = change in momentum transferred. momentum Time taken Work, energy and So, to get a bigger change in mom, Work = force x power we follow through = more time. distance. Also, to get a smaller force, we make time large eg crumble zoneKinetic energy = Power = work done1/2 mass x Time Momentum is always Gravitational potential(velocity squared) energy = mass x g x h Measured in watts, W conserved in collisions Mom before = Mom after and explosions, 0 = 0