A pulley makes work easier by lifting heavy loads.
100
Who developed the laws of motion?
Sir Isaac Newton
100
Describe a wedge
A wedge has one or two sloping sides, a wide end and a narrow end.
100
Define energy.
Energy is the ability to do work.
200
What is the definition of force?
The push or pull on an object.
200
How does a wedge make work easier?
A wedge helps to cut, push or split an object.
200
Describe the first law of motion.
An object in motion stays in motion unless an outside force acts upon it.
200
Describe a pulley
A pulley is a wheel with a groove that holds a rope or chain.
200
Where do people get their energy from?
The food that they eat.
300
What is the definition of motion?
Having to do with movement or moving.
300
How does a lever make work easier?
A lever is used to lift heavy objects that cannot be lifted by themselves.
300
Describe the second law of motion
The motion of an object changes when a force acts on it. The greater the force, the more the object is affected.
300
Describe a lever
A lever is a long, stiff bar, that rests on a point called the fulcrum.
300
What are the two major types of energy?
Potential and Kinetic
400
What is the definition of gravity?
Gravity is the force between all objects. Earth's gravity keeps our feet on the ground.
400
How does a screw make work easier?
A screw joins two or more objects together.
400
Describe the third law of motion
Forces always come in pairs. The two forces are equal in strength but they point in opposite directions.
400
Describe a screw
A screw is an inclined plane wound around a cylinder.
400
Where does energy start?
The sun
500
What is the definition of friction?
Friction is the force that slows or stops motion between two surfaces.
500
How does a inclined plane make work easier?
An inclined plane moves a heavy load up or down.
500
Give an example of each law of motion.
1st law-golf ball staying still until an outside force hits it
2nd law- A young child throwing a ball, an adult throwing a ball.
3rd law-letting a balloon go after blowing it up
500
Describe an inclined plane
An inclined plane is a surface that slants.
500
What is potential energy?
What is kinetic energy?
Potential energy is stored energy.
Kinetic energy is moving energy.