A child\'s sled has rails that slide with little friction across the snow. Logan

Question

A child's sled has rails that slide with little friction across the snow. Logan has an old wooden sled with heavy iron rails that has a mass of 8.0kg quite a bit for a 29kg child! Logan runs at 4.3m/s and leaps onto the stationary sled and holds on tight as it slides forward. The impact time with the sled is 0.27s .

1. Immediately after Logan jumps on the sled, how fast is it moving? value+units
vf= ???

2. What was the force on the sled during the impact? value+units
F=

3. How much energy was "lost" in the impact? value+units
Delta K = .....

4.Where did this energy go?
the energy was dissipated as.....
a. gravitational potential energy
b. elastic potential energy.
c. kinetic energy
d. thermal energy

Explanation / Answer

Conservation of momentum 31 . 4.1 = (31 + 11 ) . V (sled ) V = 31 . 4.1 / 42 Force . time = change in momentum of the sled F . 0.27 = 11 . 31 . 4.1 / 42 F = 11 . 31 . 4.1 / 42 . 0.27 N Energy "lost" is (0.5 . 31 . 4.1^2 ) - ( 0.5 . 42 . ( 31 . 4.1 / 42 )^2 )

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