Types of Energy
The ability to do work or cause change
What is energy?
To prepare for cold weather, Caitlyn’s dad is cutting wood into pieces small enough to use in his wood stove. He uses a sharp wedge to cut the wood. Which of the following questions does the wedge help solve?
A. How can additional force be created by a tool?
B. How can the amount of friction caused by the wood be changed?
C. How can the amount of force needed to cut the wood be changed?
D. How can the direction of force sent into the wood be changed to make the wood split?
What is D?
What kind of interaction (P.E) exist when one climbed up the slide?
What is gravitational potential energy?
Jason is cutting logs for a fire. Which type of simple machine will best help Jason?
What is a wedge?
Which statement best describes how gravitational potential energy is stored in the system?
1. The two objects in the system naturally attract each other. Decreasing the distance between the objects will increase the amount of energy stored in the system.
2. The two objects in the system naturally repel each other. Increasing the distance between the objects will increase the amount of energy stored in the system.
3. The two objects in the system naturally repel each other. Decreasing the distance between the objects will increase the amount of energy stored in the system.
4. The two objects in the system naturally attract each other. Increasing the distance between the objects will increase the amount of energy stored in the system.
What is statement 4?
Marquis has been tasked with helping his sister move into her college dorm room. He has to help unload the moving van, take boxes up the elevator to the third floor, put them on a moving cart to roll them to the room, prop the door open, and then unload the boxes onto the floor.
What are all the simple machines that Marquis must use to complete his job?
What is inclined plane, pulley, wheel and axle, and wedge ?
What happen to the potential energy stored in the system as the child goes up and down the slide?
What is P.E increases going up and P.E decreasing going down?
Select the three statements that are examples of work.
1. A teacher gives a lecture in class.
2. A student listens to classical music.
3. A father pushes a baby in a carriage.
4. A cat walks from the bushes to the garage.
5. A baseball player throws a ball across a field.
6. A woman picks up and carries a grocery bag to her car.
What are statements 3,5,6?
William wants to move a large rock from his yard. What simple machine should he use, and why?
What is a lever because it will change the amount of force that is needed to move the rock ?
A science class goes to an amusement park to investigate potential and kinetic energy. Which action best demonstrates potential energy being transformed into kinetic energy?
1. a fireworks rocket shoots upward into the night sky above the park
2. a roller coaster slowly climbs the tall hill at the beginning of the ride
3. a bungee jumper is released at the top of a tall tower and starts to fall
4. a moving bumper car slams into another bumper car that is sitting still
What is statement 3?
Amanda is slowly pushing a heavy box across a carpeted floor. After struggling for several minutes, Amanda lifts the box on top of a cart with wheels. Now, she is able to push the box quickly across the carpet. Which problem was solved by putting the box on wheels?
What is friction was reduced?
If a large force is exerted on an object, when is no work performed?
What is when the object does not move ?
Taylor says he likes using simple machines because they do his work for him. Alicia says that simple machines only help do the work, but do not do the work for you. Which best describes who is correct?
A. Alicia is correct because simple machines use electricity to help perform jobs.
B. Taylor is correct because simple machines are always used without anyone touching them.
C. Taylor is correct because simple machines are always used in factories and don't require work.
D. Alicia is correct because simple machines change the amount of work required but still require work.
What is D?