3. Consider a sled sliding down a frictionless hill as shown. The work done on t

Question

3. Consider a sled sliding down a frictionless hill as shown. The work done on the sled due to gravity is... (positive or negative)?

Positive O Negative O t depends on the shape of the hill D Question 4 1 pts Consider a sled sliding down a hill, starting from rest at the top. as shown above. There is friction between the sled and the snow. What is the relation between the final kinetic energy of the sled at the bottom of the hill and the work done on the sled by gravity as it goes down the hill? O The final kinetic energy is greater than the work done by gravity. O The final kinetic energy is equal to the work done by gravity. O The kinetic energy and work done by gravity are not related. O The final kinetic energy is less than the work done by gravity.

Explanation / Answer

3.positive. as the angle between the component of Mg and displacement is less than 90....The work done is always positive.

4.The final kinetic energy is less than workdone by gravity.

Due to presence of friction the workdone by gravity some parts of it will convert into heat energy

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