7-1 What is Energy?
What is energy?
Energy is the ability to do work or cause change.
Mechanical energy is associated with the motion, position, or shape of an object. It is a combination of its potential energy and its kinetic energy.
Which forms of energy can be transformed into which other forms of energy?
All forms of energy can be transformed into all other forms of energy.
What is the formula for power?
Power = Energy Transferred/ Time
Kinetic, potential, nuclear, thermal, electrical, electromagnetic, chemical.
What is the law of conservation of energy?
Energy cannot be created or destroyed. No energy is lost in energy transformations.
What is kinetic energy? Name one example of an object that has kinetic energy.
Kinetic energy is the energy that an object has due to motion. One example is a moving car.
What type of energy is stored in our foods?
Chemical energy. It is the potential energy that is stored in chemical bonds.
Give one example of a single transformation.
Ex. a slingshot converting elastic potential energy to kinetic energy
What is potential energy? What are two different kinds of potential energy? Name one example of an object with potential energy.
Potential energy is the energy that results from the position of shape of an object. Gravitational potential energy is related to an object's height. Elastic potential energy is the energy associated with objects that can be compressed or stretched, like a stretched rubber band.
What is thermal energy? How is thermal energy different from temperature?
Thermal energy is the total kinetic and potential energy of the particles in an object. Temperature just measures how fast particles are moving, but thermal energy also depends on the amount of mass in an object.
Give one example of a multiple transformation.
The sun transforms nuclear energy into electromagnetic energy, which plants transform into chemical energy.
What is the formula for kinetic energy? What is the kinetic energy of an object with a mass of 20kg and a speed of 3 m/s?
Kinetic energy = 1/2 • Mass • Speed
90 joules
Compare and contrast nuclear fusion and nuclear fission.
Nuclear fission releases energy when an atom's nucleus splits apart. Nuclear fusion releases energy when atoms' nuclei join together.