Energy Equations
What is the equation for mechanical energy?
ME=PE+KE
What type of energy does a parked car have?
potential energy
A push or pull is called what?
Force
Krista has a potential energy of 50 J when she is sitting down, then she stands up and uses 50 J of kinetic energy. What is her mechanical energy?
100 J
What does the law of conservation of energy state?
Energy is NOT created or destroyed or if an object loses energy, something else has to gain that energy.
What is the equation for work?
work=force x distance
A toaster uses what two types of energy?
Electrical and thermal
Exerting a force on an object that causes the object to move in the SAME direction is called what?
Work
How much work is being done if Mrs. Taylor pushes a wheelbarrow 10 meters with a force of 50 Newtons? 100 bonus points if you use the correct unit for work.
500 N/m
Kinetic energy is determined by its _______ and _______.
speed and mass
1/2mass x speed squared is the equation for what?
kinetic energy
radiowaves, xrays, microwaves, and uv rays are all examples of what type of energy?
electromagnetic radiation
What is potential energy related to an object's VERTICAL position?
gravitational potential energy
A girl with a mass of 50 kg is jogging at a speed of 2 meters per second. What is her kinetic energy? 100 bonus points for correct unit for kinetic energy.
100 J
What are the two types of nuclear reactions we talked about?
fission and fusion
What is the equation for gpe?
gpe=weight x height
Petroleum oil is converted to gasoline. When your car burns it by breaking bonds, that is what type of energy?
chemical energy
Energy related to an object's motion, shape, and/or position.
mechanical energy
A cat has a weight of 40 N. The cat is lifted 2 meters off of the ground. What is the cat's gravitational potential energy?
80 J
If I do 100 J of work per second, how many watts of power is that?
100 watts
What are the 3 ways to write the equation for power?
power=force x distance/time
power=energy transferred/time
When a light bulb is off it is using ______ _______ ______.
electrical potential energy
Potential energy that comes from the positions of the particles in a material.
Chemical energy
How much power does Annie have if she carries a basket 5 feet up a hill with 10 newtons of force in 10 minutes? 100 bonus points if you get the unit for power correct.
5 watts
The 2 SI units you could use for force are the _____ and _______?
N-m (newton-meter) and joule (J)