Introduction to Energy
The unit for energy is the [ ].
joule
What is the energy of an object because of its potential and kinetic energies?
mechanical energy
When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change?
work
Abin is doing work by lifting a bowling ball. Which statement could be made about the energy in this situation?
It is being transferred from his arm muscles to the ball.
When Anna eats an apple, the sugars in that apple are broken down into the substance called glucose. Glucose is then burned in her body for energy. One of the body parts that needs this energy is the heart, which beats due to electrical impulses. A byproduct of this glucose breakdown is the heat that warms her body and is later released. Which identifies the energy transformations that take place in Anna's body as this process takes place?
Chemical energy is converted to thermal energy and electrical energy.
Which is occurring when work is being done?
Energy is being transferred.
Shondra takes notes in class. I. Electromagnetic Waves II. The ability to work - Has many forms - Mechanical III. Potential energy - Chemical - Elastic - Gravitational Kinetic energy - Energy of movement - Electrical IV. Nuclear - Radiant - Thermal One line of Shondra's notes is irrelevant to the rest of her notes. Which line is about a different topic than the rest of Shondra's notes?
I
[ ] energy is the energy an object has because of its motion.
Kinetic
Which statement best describes the work and energy in these examples? Example 1: Running a car requires gas. Example 2: Humans require food to live.
The gas and food are examples of energy.
Four people make observations recorded in the table. Which best describes what all of the observations have in common?
They involve changes in energy.
Gabriel is performing an experiment in which he is measuring the energy and work being done by a ball rolling down a hill. Which statement best describes Gabriel's measurements?
They will both be recorded in joules.
Which statement best defines the relationship between work and energy?
Work can transfer energy between objects and cause a change in the form of energy.
What are two forms of mechanical energy?
elastic and gravitational
What kind of energy involves the flow of positive charges?
electrical
Johanna is studying what happens to the energy as a ball rolls down a ramp. What is she studying? Check all that apply.
gravitational potential energy kinetic energy mechanical energy
Atoms contain subatomic particles called protons and neutrons. When these protons and neutrons split, a lot of energy is released. What kind of energy is this?
nuclear
The sun emits electromagnetic waves at many frequencies, but mostly in the infrared, visible, and ultraviolet spectrums. What kind of energy is this?
radiant
When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?
thermal
Work can [ ] energy between objects and can cause a change in the form of energy.
transfer
If Jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, [ ] is being done.
work