Energy 1
Define energy
the ability to do work
This is the abbreviation for kinetic energy.
K.E
The biggest source of light energy
sun
Energy possessed by a drop of water about to fall from the top of a waterfall.
Potential energy
MLTHREA
THERMAL
What are the two main groups of energy?
Potential + Kinetic
energy in motion
kinetic energy
Energy can not be lost or destroyed, only transformed into a different form of energy. True or False
True
The abbreviation for potential energy.
U
Potential energy associated with objects that can be compressed.
Elastic potential energy
RACENUL
NUCLEAR
True or false: Energy can be created or destroyed
False
Type(s) of energy used by an oven use to bake cakes.
Electric energy and heat energy
A hair dryer transforms _______energy to _____ and ________
electrical, heat and sound
True or false: Energy is anything that has mass and takes up space.
False. The answer is matter.
Which has more gravitational potential energy: the same book on the floor or on a high shelf?
Higher
TEPLTIOAN
potential
You leave a metal spoon sitting in a cup of hot chocolate. The handle eventually becomes warm. Which type of heat transfer caused this?
Conduction
What is stored energy?
Potential Energy
What is the energy transformation when you rub your hands together
kinetic/mechanical to thermal
If there is friction between 2 moving bodies, then mechanical energy is converted into............
heat
Both of these types of energy produce "waves" and are a part of our bodies' senses. Some examples are your tv, and your phone.
light and sound
TECAICELLR
electrical
You can feel the warmth of a campfire even though you are not touching it. What type of heat transfer allows the energy to reach you?
Radiation
What energy store increases when an object gets hotter?
thermal energy
If you were to fall, this would increase as you fell.
kinetic energy
A toaster changes electrical energy into which main type of energy?
Thermal energy
If you have a bowling bowl, basketball, and a tennis ball moving in the same speed, which ball have more kinetic energy? Why?
Bowling ball - it has more mass.
CINCLMAAHE
mechanical
A stretched rubber band has what type of stored energy?
Elastic Potantial Energy
A book is lifted from the floor onto a high shelf. Which energy store increases?
G.P.E
A torch is switched on. Describe the main energy transformation.
Chemical energy in the battery → electrical → light + thermal energy
A solar panel receives light energy from the Sun. What type of energy does it produce?
Electrical energy
A light bulb produces light but also becomes hot. Which is the useful energy output and which is the wasted energy output?
Useful = light; wasted = thermal
TEERMUPTEAR
TEMPERATURE
A ball rolls down a hill. Which energy store decreases and which increases?
Gravitational potential decreases; kinetic increases
A moving car brakes and stops. What happens to its kinetic energy?
Mostly transferred to thermal energy
This form of energy is caused by object's vibrations that transmits energy through the air around it.
sound energy
A battery-powered toy car moves and makes sound. Name three types of energy involved.
Chemical → electrical → kinetic + sound (thermal also acceptable)
A television is switched on. Name three energy outputs it produces. .
Light, sound and thermal
TOOANFNAIMRSRT
transformation
A pot of water is being heated on a stove. Match each situation to conduction, convection or radiation:
A. Heat travels through the metal pot.
B. Hot water rises and cooler water sinks.
C. Heat can be felt from the hot stove without touching it
A = Conduction, B = Convection, C = Radiation