Newton’s 3 Laws of Motion

• Sir Isaac Newton• First Law of Motion• Second Law of Motio

n• Third Law of Motion• Review• Quiz• Reference

Sir Isaac Newton

• Born: England, December 5, 1643

• He lived until age 85• Raised by his grandmother• Attended Trinity College

Cambridge• Knighted by Queen Ann in

1705• Newton laid the way for

science because of his ideas about motion

• Bio for Kids

First Law of Motion

An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and

in the same direction unless acted upon by an unbalanced force.

This law is often called "the law of inertia".

What does this mean?

This means that there is a natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.

Second Law of Motion Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force

needed (to accelerate the object).

What does this mean?• Everyone unconsciously knows

the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.

• However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation: FORCE = MASS times ACCELERATION

• Hockey game highlightsWhat will fall first? Elephant or feather?

Third Law of Motion For every action there is an equal and opposite re-action.

• This law states that every action has an equal and opposite reaction. If you have ever stepped off a small boat that has not been properly tied to a pier, you will know exactly what

this law means. • The rocket's action is to

push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.

Review• Rockets are launched into space using jet propulsion where exhaust

accelerates out from the rocket and the rocket accelerates in an opposite direction. Answer

• A picture is hanging on a wall and does not move.

Answer

• Two students are in a baseball game. The first student hits a ball very hard and it has a greater acceleration than the second student who bunts the ball lightly. Answer

• A soccer player kicks a ball with their foot and their toes are left stinging.

Answer

• A person’s body is thrown outward as a car rounds a curve on a highway.

Answer

Quiz

1. Who was the scientist who gave us the Law of Motion?

2. How many Laws of Motion are there?

3. What is another name for the first Law of Motion?

4. What law says that force equals to mass times acceleration?

5. Which law states that for every action there is an equal and opposite reaction?

Quiz Answers

1. Sir Isaac Newton

2. There are three laws of motion

3. Law of Inertia

4. Second Law of Motion

5. Third Law of Motion

Reference

• Technology Standards

• California State Standards

Second grade 1:a,b,e

• http://www.biography.com/bio4kids/bio4kids-meet-newton.jsp

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