Need help on the Law of Momentum Conservation?!?

timer Asked: Mar 29th, 2015

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Part 2: Complete the following math problems by using the Law of Momentum Conservation.


i. Momentum = (mass) * (velocity)
Impulse = (Applied force) * (time)  and  Impulse = Change in Momentum
Applied Force = (Change in Momentum) / (time)
For multiple objects: Total Momentum of everything before interaction = Total Momentum of everything after

6. A car of mass 1100kg moves at 24 m/s. What is the braking force needed to bring the car to a halt in 2.0 seconds? (Use i and iii)

7. What is the force on a 0.025 kg egg from a bed sheet as the egg hits the sheet at 4.0 m/s and takes 0.2 seconds to stop? (Use i and iii)

8. A 8.0 kg shell leaves a 2.0 x 103 kg cannon, at a speed of 4.0 x 102 m/s. What is the recoil speed of the cannon? (Use i and iv)

9. A 1.0 kg dart moving horizontally at 10.0 m/s makes impact and sticks to a piece of wood with a mass of 9.0 kg, which then slides across a friction free surface. What is the speed of the wood and dart after the collision? (Use i and iv)

10. A 10,000-kg train car coasting at 10 m/s collides with a 2000-kg automobile coasting at 30 m/s in the opposite direction. If the stick together after the impact how fast and in what direction will they be moving? (Use i and iv)

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