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Input and output energy
Types of Energy
Kinetic Energy
Potential Energy
Conservation of energy
100
Explain what "input" and "output" energy mean
Input: the type of energy that makes an object work Output: the purpose of that object; in other words, what the input energy got converted into
100
What are the two main types of energy?
potential and kinetic
100
What is kinetic energy? Give a definition
Energy of movement
100
What is potential energy?
stored energy
100
What is the law of the conservation of energy?
Energy is neither created nor destroyed; it transforms
200
What is the input energy of a toaster? What is the output energy?
input: Electric energy output: heat energy
200
Is chemical energy potential or kinetic energy?
Potential
200
What is the formula for kinetic energy?
KE=1/2mv¨2
200
What is the formula for gravitational potential energy?
PE=mgh
200
Draw a rollercoaster and analyze whether it has potential or kinetic energy at three different points
top of a hill: PE bottom of a hill: KE in the middle of a hill: both
300
What is the input, output and waste energy of a light bulb?
input: electric output: light waste: heat
300
Is thermal energy potential or kinetic energy?
kinetic
300
Give two examples of kinetic energy
dog running, girl walking, apple falling from a tree etc. (energy of movement)
300
What is the formula for spring potential energy?
PE= 1/2 k x¨2
300
A 3kg toy truck moving with a speed of 2m/s starts up a ramp. How high does the truck roll before it stops?
0.20 m
400
What is the input, output and waste energy of a car?
input: chemical energy output: kinetic energy waste: heat, sound etc
400
Is nuclear energy potential or kinetic energy?
potential
400
What is the kinetic energy of a 10 Kg apple falling from a tree with a velocity of 5m/s?
125 J
400
An apple is hanging from a tree. Calculate the height of the apple if it has 10 J of energy and it has a mass of 5kg
0.20 m
400
A 5kg box is sliding across a table with a velocity of 10.84 m/s when it encounters a spring. How far will the box slide before the spring brings it to rest? (spring constant 3N/m)
13.99 m
500
Give one example of a system that shows the law of conservation of energy
rollercoaster: potential to kinetic (waste: heat)
500
If kinetic energy is energy of motion, explain why radiant energy is a type of kinetic energy (what´s moving?)
Radiant energy is electromagnetic energy that travels in transverse waves. These waves are produced by the vibration of charged particles
500
What is the velocity of a 60Kg girl that is running with 30 J of energy?
1 m/s
500
What is the potential energy of a compressed spring with a constant of 15 J/m and a displacement of 5m?
187.5 J
500
A 90Kg car is going down a hill with an angle of 5 degrees. If the car travels a distance of 500m and there is a force of friction of 60N, what is the speed of the car at the bottom of the hill?
13.71 m/s