energy 1
Energy that has the ability to cause a change is ___________.
potential energy
A lens causes light to bend or _____________.
refract
The energy of motion is ______________________.
kinetic energy
Objects_____________light that they take in.
absorb
The path that a controlled electric current flows through is a(n)________________________.
electric circuit
Two balloons will push away from each other if they have the same____________________.
electric charge
Mirrors work because they_______light.
reflect
A(n)_____________is the movement of electrical energy from one place to another.
electric current
The total energy of all the particles in an object is the amount of _______________the object has.
thermal energy
You are having hot soup for lunch. You put a metal spoon in your soup and leave it for a minute. Predict what will happen to the spoon.
Heat travels from the soup through the cooler spoon. The spoon will feel warm.
What kind of energy is stored in a battery?
chemical energy
What colour is an object if it reflects blue?
blue
A dark towel that is placed in the sunlight feels warm because it ______________________________.
absorbs the Sun's rays.
Explain how to measure the energy of a wave.
Measure the length of the wave. The distance from the top of the crest to the top of the next crest is the length of a wave.
Describe how light energy travels.
Light travels from its source in straight lines in all directions.
If an object has a temperature of 100C and the air around it is 200C, will the object gain or lose heat energy? Explain your answer.
The object will gain heat energy because it has too little thermal energy to stay at 100C.
What would happen to the electric current if the part of the light bulb that glows break?
The energy would not flow through. The light will not go on.
What is the difference between a controlled and uncontrolled electric current?
A controlled electric current must travel in a planned way through wires or other materials. An uncontrolled electric current can travel in any direction.
Give an example of a controlled and uncontrolled electric current.
An uncontrolled electric current is lightning and a controlled electric current can turn on lights or make a CD player work.
What happens when an electric circuit is open?
The current could not flow through the circuit.
What causes lightning?
Lightning happens when negative electric charges travel within clouds or between clouds and the ground.
How does a shadow form?
Light will not bend or turn corners in order to get around objects. Objects that block light's path cause shadows. Shadows are areas behind the objects that are not getting direct light.
Name 3 sources of light energy.
Sun's energy. Chemical changes, such as burning candles, campfires, and matches. An anglerfish's tentacle.
Give 2 examples of potential energy and kinetic energy that you see everyday.
Potential energy: a skier standing, oil, coal, gasoline
Kinetic energy: Using batteries, fuels, a skier sliding down a hill
Name 2 types of energy that travel in waves. What happens to energy as it travels away from the source.