Energy
What is Energy?
Energy is the ability to do work, make things happen, or cause a change.
What is a force?
a push or pull on an object
What is motion?
a change in an object's position
What is speed
How fast an object moves
What type of energy is stored in an object because of its position or condition?
Potential energy.
What type of energy does a device have if it contains both kinetic and potential energy?
Mechanical energy
What force pulls objects toward Earth?
gravity
What happens to a ball's motion when you kick it?
The force can make it start moving or change its speed or direction.
Two students race to the finish line. One gets there first. Who moved faster?
The student who got there first.
What type of energy comes from the Sun?
Light energy.
What type of energy is stored in food and batteries?
Chemical energy
What type of force slows objects down when surfaces rub together?
friction
What is the difference between an object at rest and an object in motion
An object at rest stays in the same position, while an object in motion changes position.
The faster an object moves the more ______________ it has
energy
What happens when two objects collide?
They can transfer energy and change motion.
What is it called when energy moves from one object or place to another?
energy transfer
What is the difference between a balanced force and an unbalanced force?
Balanced forces do not change an object's motion; unbalanced forces can change its motion.
A soccer ball is rolling east, but a player kicks it north. What changed about the ball’s motion?
The ball changed direction.
Which has more kinetic energy: a slowly rolling ball or the same ball moving quickly?
The ball moving quickly.
What type of energy does a vibrating guitar string produce?
Sound energy.
What law states that energy cannot be created or destroyed, only transferred or transformed?
law of conservation of energy
A toy car slows down after rolling across the floor. What force helps cause it to slow down?
friction
A moving toy car hits a stationary toy car. How can the collision affect the stationary car's motion?
The stationary car can begin moving because energy is transferred during the collision.
What happens to a moving object's kinetic energy when it slows down?
Its kinetic energy decreases.
What happens to energy when a battery powers a flashlight?
Chemical energy is converted into electrical energy and then into light and thermal energy.