A force of 8N is applied on the wooden block. If the ball is in contact with the wall for 0.02s, find: The impulse The force exerted on the ball.ġ8 Exercise 3 Figure shows a 2kg wooden block initially at rest on a smooth surface. On impact, the ball bounces back horizontally at a velocity of 10ms-1. The impulsive force exerted on the ball by the hands.ġ7 Exercise 2 A 300g ball is thrown horizontally towards a vertical wall at a velocity of 12ms-1. 15 ms-1 20 ms-1 Calculate : The impulse applied to the ball. The time of contact between the land and the ball is 0.05s. Figure shows the magnitudes of its velocity before and after being hit respectively. 1 2.6 Understanding Impulse and Impulsive Forceįorce and Motion 2.6 Understanding Impulse and Impulsive ForceĢ IMPULSE Is defined as the product of a force, F acting on an object of mass, m for time ,t Impulse = Force x Time Impulse = Ft Also can be define as the change of momentum Impulse= mv – mu Impulse ,Ft = mv – mu Unit kgms-1 or Ns Is a vector quantityģ IMPULSIVE FORCE Large force that acts over a short period of time during collision or explosion Also can be define as the rate of the change of momentum in a collision or an explosion Formula : F = mv – mu t Unit kgms-2 or N Example involving impulsive force: Football Playing golf Playing baseball Playing tennis Playing badmintonĨ INCREASING THE TIME IMPACT TO REDUCE THE IMPULSIVE FORCEġ2 DECREASING THE TIME IMPACT TO INCREASE THE IMPULSIVE FORCEġ6 Exercise 1 A boy hits a 0.50kg ball and sends it moving the opposite direction.
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