Energy & Energy Transfer
What is energy?
The ability to do work or cause change.
What force pulls objects toward Earth?
Gravity.
What is speed?
How fast something moves.
What is a collision?
When two objects hit each other.
What is flow in a circuit?
Electricity
Name two forms of energy.
heat, light, sound, motion, electrical.
When is gravitational potential energy the greatest?
When an object is at its highest point.
Does a faster object have more or less energy?
More energy.
What happens to energy during a collision?
It transfers between objects.
What is needed to complete a circuit?
A power source, wires, and a load (like a bulb).
What is energy transfer?
When energy moves from one object to another.
What happens to gravitational energy as an object falls?
It changes into kinetic (motion) energy.
What happens to energy when speed increases?
Kinetic energy increases
Why do helmets help protect your head?
They absorb energy during a collision.
What happens if a circuit is open?
The electricity cannot flow
What type of energy is felt when you touch a hot stove?
Thermal (heat) energy.
Which has more gravitational energy: a book on a desk or on the floor?
On the desk.
Which has more kinetic energy: a slow bike or a fast bike? Why?
A fast bike because it is moving faster.
What might happen if a car crashes at high speed?
Greater damage because of higher kinetic energy.
What energy change happens in a lamp?
Electrical to light and heat.
Explain how energy changes when you turn on a flashlight.
Chemical energy in the battery changes to electrical energy, then to light and heat energy.
Why does a roller coaster have the most potential energy at the top of a hill?
Because it is at its highest height above the ground.
Why can a fast-moving ball cause more damage than a slow-moving ball?
Because it has more kinetic energy.
How do airbags reduce injury?
They spread out the force and absorb some energy.
Why are batteries important in a circuit?
They provide chemical energy that turns into electrical energy.