Kinetic Energy
What is kinetic energy?
The energy of motion
What is potential energy?
Stored energy based on position or condition.
What is mechanical energy?
KE + PE.
What does “energy transformation” mean?
Energy changing from one form to another.
What does the M in MELTS stand for?
Mechanical
If an object moves faster, what happens to its kinetic energy?
It increases
What is the formula for PE
PE = mgh
If there is no friction, what happens to total mechanical energy?
It stays the same.
What law says energy cannot be created or destroyed?
Conservation of Energy.
What energy travels through wires?
Electrical energy.
What affects kinetic energy more—mass or speed?
Speed (because it is squared)
When an object falls, potential energy transforms into this type of energy?
Kinetic energy
A roller coaster at the top of a hill has mostly what type of energy?
Potential energy.
What transformation occurs in a battery powering a flashlight?
Chemical → electrical → light + heat.
What energy travels in waves and can be seen?
Light energy.
A bowling ball moving at 5 m/s has more kinetic energy than a tennis ball at the same speed because it has more.....
Mass
In potential energy formula, what does G stands for and what is the number?
Gravity = 9.8 m/s
A roller coaster has 200 J of PE and 300 J of KE. Friction removes 50 J. What is its new mechanical energy?
450 J.
A device outputs 40 J of light and 60 J of heat. How much electrical energy was input? What law explains this?
Input = 100 J (Conservation of Energy).
What type of machine is a ramp?
Inclined Plane
Two objects have the same kinetic energy. Object A has twice the mass of Object B. Which object is moving faster?
Object B — smaller mass must move faster for equal KE.
A 2 kg book is sitting 2ft bookshelf. What is the Potential energy
A system has 500 J mechanical energy. Its PE is 120 J.
What is its KE?
KE = 380 J
What is a simple machine?
A device that changes the amount or direction of force.
A flag pole acts as this simple machine?