Unit 8, Lesson 2- Mechanical Energy

Work

Potential energy

Mechanical energy

Work

Potential energy

Mechanical energy

Work

Potential energy

Mechanical energy

It begins with potential energy, as the ball goes up the kinetic energy increases and the potential energy decreases. When the ball reaches the top, the potential energy increases and kinetic energy decreases. As it comes back down, potential energy decreases and kinetic energy increases

The potential energy and kinetic energy doesn't change as the ball moves up and down

The ball has kinetic energy when it's held, and when the ball is tossed up the potential increases and the kinetic energy decreases, and then when it comes down the kinetic decreases and the potential energy also decreases

Yes, because mechanical energy is conserved as the swing moves back and forth.

No because some of the energy transfers to the air and some energy transforms into other types of energy. But the total energy is conserved.

Yes, mechanical energy is always the same.

The swing will keep moving as the energy changes from potential and kinetic energy

Nuclear energy and electrical energy make up mechanical energy

Mechanical energy is made up of sound energy and thermal energy.

Mechanical energy is made up of potential energy and kinetic energy

As potential energy increases, the kinetic energy also increases

As the total energy stays the same, kinetic energy increases as potential energy decreases

The total energy goes up and down as potential and kinetic energy changes

As kinetic energy changes, the potential energy changes so that the total energy changes

A real world pendulum would perform exactly as this pendulum

A real world pendulum would have more kinetic energy

A real world pendulum would have decreasing potential and kinetic energies as the pendulum would slow down and eventually stop

A real world pendulum would have more total energy over time than this ideal pendulum

No work was done because even though she used force in trying to open the door, the door did not move

Some work was done because she used energy and tried to force the door open

She used energy and force so when she tried to open the door, she applied to work on the door

Brianna found out later that it wasn't a door that she was pushing on, but it was the wall of the classroom

24 J

16 J

0.8 J

20 J