6. WINTER Template 06 DESIGN AN EXPERIMENT What can we do to investigate the impulsive force? Materials: Eggs Newspapers Sponges
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8. RESULT & OBSERVATION 08 Surface types Contact time Observation on egg Force Table Longer / Shorter Break / Did not break Larger / Smaller Sponge Longer / Shorter Break / Did not break Larger / Smaller
9. Relationship between force and change in momentum 09 Before After Is the egg experience any changes in momentum?
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11. WINTER Template 11 CONCLUSION -The contact time on impact is affected by the hardness of surface. The harder the surface, the shorter the contact time on impact -When contact time is shortest, the force of impact will be larger -The force is directly proportional to the change in momentum
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13. Example: A bullet of mass 50 g is shot and it travels at a velocity of 100 m/s towards a target and takes 0.01 seconds to come to a stop. What is the impulsive force hitting the target?
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16. APPLICATION OF IMPULSIVE FORCE 13 Both cars travel at a velocity of 120 m/s and hits a wall. Why does the impact on car A is smaller compared to car B? A B
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20. What are other applications of impulsive force in our daily lives? Can you explain?? 15
21. WINTER Template 16 Do you want to play some games? INSTRUCTIONS: -You are allowed to discuss during the game -The task for each player is to calculate the questions given -Given that initial velocity of the ball is 0 ms -1 and mass of the ball is 2 kg . The result of the calculation will determine whether it’s a goal or a miss
22. 17 Kick no. Final velocity (v) Time of impact (t/s) Impulsive force (F/N) Result of the kick 1 45 0.3 300 GOAL / MISSED 2 25 0.2 250 GOAL / MISSED 3 30 0.6 100 GOAL / MISSED 4 30 0.2 300 GOAL / MISSED 5 30 0.6 100 GOAL / MISSED 6 10 0.8 25 GOAL / MISSED Initial velocity (u) = 0 m/s Mass of ball (m) = 2kg