Impulsive Force

Learning Outcomes  At the end of the lesson, a student is able to: State the definition of impulse and impulsive

force in their own word. Relate the impulsive force with rate change of momentum. Calculate one questions related impulse and impulsive force

Try answer this question.. What is the definition of impulsive

force???

Try answer this question.. What is the definition of impulse???

Question A tennis player hits an oncoming ball with a mass

of 0.2kg and a velocity of 20ms-1. The ball rebounds with a velocity of 40ms-1. The time taken un the collision between the ball tennis racket is 0.01s.

a) What is the impulse experienced by the ball? b) What is the impulsive force exerted on the tennis ball? c) If the tennis ball which has a velocity of 20ms-1 is hit by the racket with a force of 50N and the ball rebounds with a velocity of 5ms-1. What’s is the time of collision between the ball and he racket?

Answer a) Impulse equals change in momentum. The ball's momentum change is m(v1 + v2) = 0.2x60 = 12 Ns b) Impulse also equals average force times time, so 12 = F x t = F x 0.01, F = 1200 N c) Momentum change = 25x0.2 = 5 Ns = F x t. For F of 50N, t=5/50=0.1s

Construct a concept maps using this three word

Impulsive force Impulse Momentum Time