10. Conservation of Energy

Which of the following are mechanisms by which energy can be transferred to or from a control volume when non-conservative forces are present?

Which of the following statements is true about the work done by a non-conservative force?

When a moving car comes to a stop due to non-conservative forces such as friction, what happens to the car's initial $KE$?

Which physical effect is primarily utilized in a turbine generator to convert mechanical energy into electrical energy?

When you drop a ball, why does it not bounce back to its original height after hitting the ground, even if you neglect air resistance?

When a car skids to a halt due to friction, what happens to its initial kinetic energy $E{k}_{\mathrm{initial}}$?

When a sled moves down a hill and friction is present, what happens to the total mechanical energy $E\_\mathrm{mech}$ of the sled?

A block of mass $m$ is pushed up a rough incline with an initial speed $v_0$. The coefficient of kinetic friction between the block and the incline is ${\mu }_k$, and the incline makes an angle $\theta$ with the horizontal. Neglecting air resistance, how far up the incline will the block coast before coming to rest and starting to roll back down?

A car of mass $m$ starts from rest at the bottom of a hill of height $h$. If the car coasts up the hill and a non-conservative friction force does work $W<0$ on the car, which of the following conditions must be satisfied for the car to just reach the top of the hill?

In the context of energy with non-conservative forces, how can an object lose mechanical energy?

When a ball is dropped and bounces repeatedly until it eventually comes to rest, which of the following best explains why the ball stops bouncing?

An 800kg car skids to a stop from 30m/s through a distance of 90m. Calculate the coefficient of friction between the car and the road.

You drop a basketball from a height of 5.0 m, which rebounds to a new height of 3.0 m. How much energy is lost to nonconservative forces? Give your answer as percentage of the initial energy.

A skier of mass m starts from rest at the top of a solid sphere of radius r and slides down its frictionless surface. If friction is present, does the skier fly off at a greater or lesser angle?

You slide down an 8.0-m-high icy hill (≈ frictionless). At the bottom is a level stretch where the coefficient of kinetic friction is 0.30. How far would you travel across the level stretch?