Physics 1 0.0 / 5 ? PhysicsForces and MotionIGCSEEdexcel Created by: krazykid789Created on: 08-03-16 17:15 What is the difference between speed and velocity Speed is a scalar quantity, velocity is a vector 1 of 33 Average speed = Distance / time 2 of 33 Acceleration = Change in velocity / time 3 of 33 In a distance- time graph what does the gradient show? Speed 4 of 33 In a distance- time graph what goes on the X axis? Time 5 of 33 In a Velocity- time graph what does the gradient show? Acceleration 6 of 33 In a Velocity- time graph what goes on the Y axis? Velocity 7 of 33 What is the gravitational field strength on earth? (give units) 10 (N/Kg) 8 of 33 Weight = Mass x gravitational field strength 9 of 33 Give 3 forces Weight, Thrust, Drag, Lift, Tension, Reaction, Electrostatic attraction 10 of 33 Give the 4 forces acting on a moving car (and their directions) Thrust (forwards), Drag (backwards), Weight (down), Reaction from the road (up) 11 of 33 What is terminal velocity? When resistance and acceleration are equal. 12 of 33 What is the first law of motion? If there are no forces acting on an object, then the object will continue at the same speed. 13 of 33 What is the second law of motion? If there is an unbalanced force acting on an object, then the object will accelerate 14 of 33 Resultant force = Mass x acceleration 15 of 33 What is the third law of motion? Every action has an equal and opposite reaction 16 of 33 If a plane has a 22,000N thrust North and 8,000N of air resistance South, what is the resultant force? 14,000N North 17 of 33 What two factors affect stopping distance? Thinking distance and braking distance 18 of 33 What affects thinking distance? your speed, How alert you are- tiredness, drunkenness, age, drugs 19 of 33 What affects braking distance? (give 3) Speed, Mass of the vehicle, Quality of brakes, Quality of the road, Weather, Tyre quality 20 of 33 Momentum = Mass x velocity 21 of 33 What is conservation of momentum momentum before = momentum after 22 of 33 What connects Force acting, Change in momentum, and Time taken? Force = Change in momentum / time 23 of 33 How does a crumple zone reduce the damage of a car crash? Crumple zones increase the time taken for the change in momentum and so reduce the force applied 24 of 33 Moment = Force x perpendicular distance FROM PIVOT 25 of 33 Moments are measured in... Newton meters 26 of 33 If an object is balanced then total anti-clockwise moments = ... total clockwise moments 27 of 33 What is Hooke's law The extension of a spring is directly proportional to the force applied 28 of 33 What is the equation for Hooke's law? F = K x E where F = force, K = spring constant, E = Extension 29 of 33 Hooke's law does not apply when... The elastic limit has been reached 30 of 33 What is an elliptical orbit? An orbit around two focii 31 of 33 Gravity decreases as you get.... Further away from the planet 32 of 33 Orbital speed = (2 x pi x orbital radius) / time 33 of 33
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