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Linear Kinetics: The Study of Force and Movement

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Newton’s laws of motion

Figure 9.4 Two hockey players approach each other. Player 1 has a velocity of 6 m/s and a mass of 90 kg. Player 2 has a velocity of 7 m/s and a mass of 80 kg. Prior to impact player 1 has a momentum of 540 kgm/s and player 2 has a momentum of –560kgm/s

Figure 9.5 Reaction forces always act perpendicular to the surface of contact. In (a) the surface is horizontal and as the reaction force acts upwards and the action or weight (W) activing downwards is equal and opposite. In (b) the surface is inclined, the reaction force is perpendicular to the surface and in this case the weight (W) acts perpendicular to the surface of contact. (c) is the same as (b) only an additional force is added therefore increasing the representative force vector lengths (magnitudes) and causing the force to be exerted perpendicular to the surface of contact

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