9. Work & Energy

A car of mass $m$ starts from rest at the top of a frictionless hill of height $h$. What is the car's speed after coasting down the other side to the bottom of the hill?

Which of these features is true of both solar and wind power?

Which statement best defines the relationship between $\mathrm{work}$ and $\mathrm{energy}$?

What type of energy can be converted to $\mathrm{kinetic}\mathrm{energy}$ when it is used to do work?

An object of mass $m$ is projected vertically upward with initial speed $u_0$. What is the speed $u$ of the object when it reaches a height equal to $\frac{1}{2}{h}_{\max }$ above the launch point? (Neglect air resistance.)

A wire of mass $m$ starts from rest and slides down a frictionless incline under the influence of gravity. If the wire has slid a distance of $1.0mm$, what will be its speed at that point?

Which type of energy does a moving skateboard primarily possess?

If the speed of a vehicle is doubled before a collision, how does its kinetic energy change? (Kinetic energy is given by $E=\frac{1}{2}m{v}^2$.)

Which of the following lists correctly identifies the three main types of mechanical energy?

The kinetic energy of an object in motion always changes when which of the following factors changes? $K=\frac{1}{2}m{v}^2$

Which two forms of mechanical energy are commonly identified in physics?

Which of the following is a form of kinetic energy?

Which two forms of energy are combined to make up $\mathrm{mechanical} \mathrm{energy}$?

Which of the following best defines $\mathrm{mechanical} \mathrm{energy}$?

How are $\mathrm{potential energy}$ and $\mathrm{kinetic energy}$ related in a closed system?