What is Energy
What is energy
The ability to do work or cause change
Which of the following has kinetic energy? A ball sitting on a shelf, a ball falling off the shelf, or a ball laying on the ground.
A ball falling off the shelf
Friction changes kinetic energy into what kind of energy?
thermal
What is nuclear fusion?
Describe six different forms of energy.
Mechanical energy is energy associated with motion and position. Thermal energy is the total potential and kinetic energy of the particles in an object. Chemical energy is energy stored in chemical bonds that hold compounds together. Electrical energy is energy associated with moving charges, or electric current. Electromagnetic energy is the energy of radiation, including visible light and microwaves. Nuclear energy is stored in the nucleus of an atom.
What is energy measured in?
Joules
What kind of energy does a windmill have?
Mechanical Energy
A large truck and a small car are traveling at the same speed, why does the truck have greater kinetic energy?
It has more mass
States that energy cannot be created or destroyed.
Law of Conservation of Energy
Explain why a thrown football has both potential and kinetic energy. What is the combined energy called?
The football has (gravitational) potential energy because of its position above the ground. It also has kinetic energy because it is moving. The combined energy is called mechanical energy.
What is power?
The rate at which energy is transferred
What do you call potential energy that depends on the height of the object?
Gravitational Potential Energy
What kind of energy transformation occurs when you warm something up on the stove?
Chemical energy into thermal energy
What kind of energy does a stretched rubber band have?
Elastic potential energy
How high must you lift a 25-newton book for it to have the same increase in potential energy as a 20-newton book that was lifted 0.5 m?
The increase in gravitational potential energy of the 20-newton book is 10 J (20 N · 0.5 m = 10 J). The 25-newton book must be lifted to a height of 0.4 m to have an increase in gravitational potential energy of 10 J (25 N · 0.4 m = 10 J).
When work is being done on an object, that object gains or loses energy?
Gains
Kinetic energy + Potential Energy = Mechanical Energy
If the velocity of an object is doubled, its kinetic energy is multiplied by ____________________.
4
What is nuclear fission
When the nuclei of an atom splits apart
On a roller coaster when is there the most potential energy and when is there the most kinetic energy?
Most potential is when the coaster is at the highest point, most kinetic is after coming down from the highest point.
What is nuclear energy?
Energy stored in the nucleus of an atom
To maintain body temperature, some animals covert chemical energy to what?
thermal energy
Aidan and Reagan