1. Force = 120 N
2. a) Force = 40 N, b) Force = 8 N
3. i) Change in momentum = 10 kg m/s, ii) Change in velocity = 50 m/s
4. Force = 3200 N
5. Force = 800 N
6. A "crumple zone" is a structural feature in a vehicle designed to deform and absorb energy during a collision. They are included in modern car designs to increase the time over which the change in momentum occurs, thereby reducing the average force exerted on the occupants and minimizing injury.
7. Starting with Newton's second law: F = m * a. Substitute the definition of acceleration, a = (v - u)/t, to get F = m * (v - u)/t. Rearranging gives F * t = m * (v - u). Since momentum p = m * v, the change in momentum is m * v - m * u = m * (v - u). Therefore, F * t = change in momentum.
Parent Tip: Review the logic above to help your child master the concept of calculating momentum worksheet.
