State the reason why the block moves at a constant velocity. A student pulls a block of wood along a horizontal surface by applying a constant force.
(b) Figure 13 shows a frictionless trolley of mass 2kg moving with uniform velocity towards a wall. Explain how the forces N, M and F enable the trailer to move. The frictional force between the trailer and the road is F. The lorry exerts a force N on the trailer and the trailer exerts an equal but opposite force M on the lorry.
(a) Figure 12 shows a lorry towing a trailer using a rope. (a) The resistance to the motion of the cart A cart of mass 30kg is pushed along a horizontal path by a horizontal force of 8N and moves with a constant velocity. (i) Determine the slope, s, of the graph. The values of d were measured and recorded for various values of initial velocity.įigure 10 shows the graph of #u^2# against d. (b) A wooden block resting on a horizontal bench is given an initial velocity, u, so that it slides on the bench surface for a distance, n, beforeĬoming to stop. if the foot was in contact with the ball for 0.1 seconds, what was the takeoff speed of the ball? A footballer kicks a ball of mass 0.6 kg initially at rest using a force of 720N. On the axis provided, sketch the graph of momentum against time for the same mass. Figure 14 shows the velocity– time graph for a small metal sphere falling through a viscous fluid. A piece of plasticine is dropped on the trolley and sticks on it. A trolley is moving at a uniform speed along a track. When the same force acts on a body of mass 2m, it causes an acceleration #a_2#. A resultant force F acts on a body of mass m causing an acceleration #a_1# on the body. A high jumper usually lands on thick soft mattress.Įxplain how the mattress helps in reducing the force of impact. Given that #V^2# = 20µd where µ is a constant for the surface, plot an appropriate graph and use it to determine µ. Table 1 shows the distance d moved by the body of various values of V. (ii) A body resting on a horizontal surface is given an initial velocity V so that it slides on the surface for some distance before coming (a) (i) State one of the Newton’s law of motion. On the axis provided, sketch the velocity – time graph for the motion of the spheres through the fluids. a solid sphere is released at the top of the the viscosity of A is higher than that of B. Figure 15 shows a tall jar containing two fluids A and B. (b) In an experiment to determine the proportionality constant, µ between two wooden surfaces sliding on each other, a block of mass (a) Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively.įigure 3 shows the velocity – time graph of the motion of the balls.Įxplain the nature of the curves and state why they are different. On the axis, provided, sketch the velocity – time graph for the motion of the body. It passes over a small region where it experiences a force ofįriction equal to the accelerating force before returning to the frictionless horizontal surface. A body initially resting on horizontal frictionless surface is accelerated by a constant force. Determine the acceleration of the trolley after the mass falls off. Surface with an acceleration of #0.5 ms^-2#. The trolley moves along a horizontal smooth An industrial trolley of mass 20kg carrying a mass of 50kg is acted on by a constant force. (ii) Calculate the distance covered by the truck just before the bullet reaches the level from which it was fired. (i) State with reason whether or not the bullet will land on the truck. A gun is fired vertically upwards from the top of an open truck moving horizontally at a uniform velocity of 50 ms-1.
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