Question

1. which of these is an example of potential energy?

a) a dog running in the yard
b) a ball rolling down a hill
c) a roller coaster at the top of a hill
d) a raindrop falling from the sky

1. which sentence best explains kinetic energy?

a) energy that is saved up and waiting
b) energy of moving things
c) energy that disappears when used
d) energy that only exists in machines

1. what happens when a stretched rubber band is released?

a) it loses all of its energy
b) its potential energy changes into kinetic energy
c) it creates new energy
d) it turns into heat energy only

Explanation:

Question 5

Potential energy is stored energy due to position. A dog running (a), ball rolling (b), and raindrop falling (d) involve motion (kinetic energy). A roller coaster at the top of a hill has stored energy due to height, so it's potential energy.

Kinetic energy is the energy of motion. Option a describes potential energy. Option c is wrong (energy is conserved). Option d is incorrect (kinetic energy exists in any moving object, not just machines). Option b correctly defines kinetic energy as energy of moving things.

A stretched rubber band has potential energy (stored due to stretch). When released, it moves, so potential energy converts to kinetic energy. Option a is wrong (energy isn't lost, just converted). Option c is wrong (energy can't be created). Option d is wrong (it's not only heat, mainly kinetic). So option b is correct.

Answer:

c) A roller coaster at the top of a hill

Question 6