Conservation of Energy Answers

What does the law of conservation of energy state about energy in a closed system?

Irving, a cat, has a favorite toy that is made up of a squeaky ball at the end of a string. The toy makes up a closed system. Irving’s owner dangles the toy so that the ball swings down and then swings back up again.

Which equation represents the law of conservation of energy in a closed system?

Cori uses 475 J of energy from her muscles to push a bar 1 m on a weight machine at the gym. Between the bar’s motion, the heat generated by the machine, and all other types of work done by the machine, J of output work will be done.

What best describes the energy in a closed system at the beginning of a day and the energy at the end of the same day? Check all that apply.Some energy can disappear after it has caused motion.Some energy can be changed from one form to another.Some energy can be lost to the environment around the system.The total initial energy will be equal to the total final energy.The total initial energy will be greater than the total final energy.Friction can cause energy to be destroyed during the day.Friction can cause the amount of thermal energy to increase.

A 535 kg roller coaster car began at rest at the top of a 93.0 m hill. Now it is at the top of the first loop-de-loop.This roller coaster’s track is nearly frictionless, so resistance can be ignored. Using g = 9.8 m/s2, what best describes the roller coaster car when it is at the top of the loop-de-loop?

When an object is not in motion, it can still have a form of energy. What form of energy does an object have due to its distance from Earth?

What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?

In physics, a is a group of related objects that interact with each other and form a complex whole.

What term is used to describe a system that loses energy to objects that are not part of the system?