Energy Concepts and Vocabulary
_______________ is the ability to do work.
(Don't overthink this one.)
What is energy?
Find the gravitational potential energy of a 0.15 kg baseball thrown to a maximum height of 12 m.
What is 17.6 J?
A rollercoaster with 100,000 J of gravitational potential energy at the top of a hill travels to the bottom of the hill along a frictionless track. Find the kinetic energy of the coaster at the bottom of the hill.
What is 100,000 J?
A taxi speeds up rapidly along a flat road after a traffic light changes from red to green. How does its GPE change? How does its KE change?
What is:
GPE stays the same
KE increases
This type of energy is stored based on an object's position.
What is gravitational potential energy?
What is 141.8 J?
If you do 30 J of work to lift a bag of groceries onto a 0.8 m tall table, what is the gravitational potential energy of the bag once it's on the table?
What is 30 J?
How does its KE change?
What is:
GPE decreases
KE increases
These two factors can affect an object's kinetic energy.
What are mass and speed?
What is 0.54 J?
A ball sits at the top of a hill at rest, with a total mechanical energy of 100 J. Find its kinetic energy when it has rolled halfway down the hill.
What is 50 J?
When an object is thrown directly upward, what is its kinetic energy when it reaches the highest point of its path?
What is 0 J?
A term used to describe the sum of kinetic and potential energy.
What is total mechanical energy?
A 30 kg jogger runs up a hill to reach an elevation of 8 m, then turns around and runs back down the hill. The whole trip takes 70 seconds, and occurs at a constant speed of 2.5 m/s.
Find the kinetic energy of the jogger.
What is 93.8 J?
A 0.11 kg hamburger falls off of a 1 m tall table. When it is halfway to the floor, how much kinetic energy does it have?
What is 0.54 J?
If you were to total all energy in the universe, would it be greater than, less than, or the same as the energy that was present at the beginning of the universe when the big bang occurred?
What is the same?
This type of energy can be stored when an object is stretched, compressed, or otherwise deformed.
What is elastic potential energy?
A 1.5 kg textbook sits on a shelf, lonely, and waiting to be studied. It has 36.75 J of gravitational potential energy. Find the height of the shelf.
What is 2.5 m?
A 0.1 kg superball is thrown upward at a speed of 12 m/s. Find the maximum height that it will reach. (Hint: assume it starts at a height of zero)
What is 7.3 m?