Physics Flashcards - Chapter 7 0.0 / 5 ? PhysicsMotionASOCR Created by: Ryan AlexanderCreated on: 14-03-17 12:50 A car is travelling at constant velocity. State the resultant force on the car. (1 mark) The resultant force is zero. 1 of 12 State Newtons first law. An object will remain at rest or continue to move at constant velocity unless acted upon by a resultant force. 2 of 12 State Newtons third law. When two objects interact, they exert equal and opposite forces on each other. 3 of 12 All interactions can be explained in terms of 4 fundamental forces, what are they? Gravitational, electromagnetic, Strong nuclear and Weak nuclear. 4 of 12 A person of weight 600N is standing still on the ground. State and explain the force exerted by the person on the earth. Force on the earth = 600N, the person and the earth interact with each other. Any explaination of Newtons third law to explain. 5 of 12 What is the equation for momentum? momentum = Mass x Velocity 6 of 12 State the principle of conservation of momentum? For a system of interacting objects, the total momentum in a specific direction remains constant, as long as no external forces act on the system. 7 of 12 State Newton's second law? The net force acting on an object is directly proportional to the rate of change of its momentum. 8 of 12 What is the equation for Newtons second law? F = (Change in) p / (Change in) t 9 of 12 State and explain the 'Special case' of F = ma. F = (Change in) p / (Change in) t , (mv-mu) / t , m (v-u / t), F = ma 10 of 12 When is the only time you can use the special case of 'F = ma'? When the mass remains constant during the period of acceleration. 11 of 12 What is 'Force x (Change in) time' ? Therefore, what is the impulse of a force? What is the unit of Impulse? (Change in) momentum, Impulse of a force = Change in momentum, unit = Ns or kgms-1 12 of 12
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