How Are Energy and Motion Related?
What is energy?
The ability to make an object move or to cause a change.
What will happen when two objects collide that are traveling at the same speed? Same weight?
Same speed = both objects will bounce back in the direction they came from with the same amount of energy (because they are transferring the same amount to each other)
Same weight = The still object will begin to move, the object that was moving will stop
What can energy be carried by?
Sound, Light, and Heat
What is an electric current?
A flow of electric charges
What is a natural resource? Give an example.
Source of energy found in nature – oil, coal, wood
What is conserved energy?
Having the same total amount of energy before and after a change happens. It cannot be created or destroyed
I want to be able to move a soccer ball by rolling or kicking another ball at it. What ball should I use to do this and why?
A bowling ball = heavy = more energy to move the ball
Energy transferred by sound starts with what?
Vibration
How would energy flow from energy to the light? Why might it be warm?
Electric currents flow through the metal wires and transfer energy to the light bulb.
When the electric current passes through the filament of a light bulb, some of energy is
converted to heat.
What are the advantages/disadvantages of natural resources?
Availability, can it be replaced, is it easily accessible
How do weight and speed connect to energy? How do you know this (what can you see)?
Heavier objects have MORE energy than lighter objects. Objects with a greater amount of speed have MORE energy than those with less speed. Heavier/Greater speed objects have a bigger splash due to more energy being transferred to the water.
How do we know energy is conserved?
If energy isn't conserved, scientists would not be able to predict what would happen in the case of a collision.
What happens when light energy is transferred? Give an example of light energy being absorbed.
It can be absorbed, reflected, and pass through material
Black shirt absorbing the light from the sun
How can energy be stored and used? Give 2 examples. (Battery, Electrical Outlets, Gasoline, Food, and Gravity)
Store light energy from the sun for electricity
Lawnmower, hair dryer, motorized toy car
What are nonrenewable and renewable resources? Give an example.
Non renewable resources – cannot be replaced (natural gas, coal, oil)
Renewable resources – water, sunlight, wind
What is stored energy? Explain using an example.
Object that is lifted off the ground has stored energy because gravity is pulling on it. These objects have the potential or ability to move or cause change
Skateboard being held. A rock being held in the air.
Two cars collide. What happens to the energy? Where does it go? In what form?
Transfers to sound, light, and heat energy.
Sound – “boom” when the impact happens
Light – a spark
Heat – Metal on car would be warm where collision occurred
How do heat and light energy connect with each other? Explain using an example.
The wire in a toaster uses heat energy to produce light and toast the bread
How can stored energy be useful? Give examples.
You’re not always near an outlet, portable charger would be useful to charge your phone but not possible without stored energy
How do energy resources we use today differ from ones used in the past?
Light – burning candles or oil lamps
Can objects gain and lose energy? Explain using an example for each.
Yes, a rock is thrown into the water. The rock will lose energy while the energy is transferred to the water. The water therefore gains energy.
What will happen when two objects collide at different speeds? What will happen to objects that weigh a different amount when they collide?
Different speeds: The object going at a faster speed will bounce back and go the speed the other object was going. The object going at a slower speed will bounce back and move at the speed of the other object.
Different Weight: The object that was not moving will roll faster than the object that was moving and the object moving will only slowly move.
If energy isn't conserved what would happen to light, sound, and heat energy?
You would be able to scream without making a noise; light from a flashlight would burn a hole in paper
What are the advantages and disadvantages of stored energy?
Some Less wasteful/expensive – can be expensive to start but cheaper over time
Electric car chargers not always available to use
What is a solution you think we should take moving forward to protect valuable resources?
Using more renewable resources instead of nonrenewable – solar panels (buy and use more)