Energy Basics
What is the ability to do work called?
Energy
What type of energy does a moving object have?
Kinetic
What is the amount of matter in an object called?
Mass
A truck weighs 500kg and is going at a speed of 60m/s how much Kinetic Energy does it produce?
900,000J
What happens to energy in food when you eat it?
Transfers to energy your body can use
Energy that is stored and waiting to be used is called this type of energy.
Mass and KE have this relationship that can be seen when graphed such as when Mass=1 KE=1 and when Mass=2 KE=2
Linear
Does greater mass increase or decrease kinetic energy?
Increase
A hay fork hits a bale at 6m/s and the fork has a mass of 10kg. How much Kinetic Energy hit the hay bale?
180J
A skateboarder at the top of a ramp has potential energy. What type of energy do they have at the bottom of the ramp?
Kinetic
What is the unit of measurement for energy?
Joule
If the mass of an object doubles what happens to KE?
Doubles
Two identical balls are rolling at the same speed. One is made of lead and one is made of plastic. Which has more kinetic energy?
Lead
A 500 kg farm vehicle moves at 4 m/s. Calculate its kinetic energy.
4,000J
Why does a heavier person need more energy to stop when running at the same speed as a lighter person?
More mass more KE
True or False: Kinetic energy depends only on speed.
Quadruples
If you double the mass of a moving object while keeping its speed the same, what happens to its kinetic energy?
Doubles
A tractor drops a hay bale that weighs 20kg what is the KE when the bale hits the ground if the speed is 0m/s?
0J What do we call this energy instead? Bonus points
A meteor falling toward Earth has both potential and kinetic energy. Which type of energy is it losing as it falls?
Potential
What is the equation for kinetic energy?
KE= 1/2mv2
Speed and KE have this relationship as seen on a graph so that when Speed =1 KE=1 but when Speed=4 KE=16
Quadratic
A feather and a bowling ball are both moving at 20 mph. Why does the bowling ball have significantly more kinetic energy?
More mass
A pendulum swings back and forth. Explain how potential and kinetic energy trade places throughout the swing.
Top all PE, Middle Increase KE decrease PE, bottom all KE no PE
A hay bale is dropped from a tractor. The bale weighs 50kg and before it hits the ground its max KE was 2000J. What is the speed of the bale at max KE?
8.9m/s