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What causes motion?. Sir Issac Newton 1642-1727 Developed laws of motion by age 24.

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Presentation on theme: "What causes motion?. Sir Issac Newton 1642-1727 Developed laws of motion by age 24."— Presentation transcript:

1 What causes motion?

2 Sir Issac Newton Developed laws of motion by age 24.

3 Newtons 1 st Law of Motion Law of Inertia A body at rest, stays at rest; a body in motion stays in motion until an outside force acts upon it.

4 Inertia Tendency of an object at rest to stay at rest, or an object in motion to stay in motion.

5 Inertia All objects resist changes in motion. All objects have mass, therefore they have inertia. An object with a small mass can be accelerated with a small force. Mass is a measure of inertia.

6 Newtons 2 nd Law of Motion The acceleration of an object is directly proportional to the force acted upon the object and inversely proportional to the mass of the object.

7 Newtons 2 nd Law of Motion If the Force increases, the acceleration of the object increases. If the mass is increased, the acceleration of the object decreases. a=F/m

8 What is the acceleration of a 132 kg object being moved with a 268 N force? m=132 kg F=268 N a=F/m a=268 N/132 kg a=2.03 m/s 2

9 Weight Force of gravity on an object Mass X Gravity (freefall acceleration) W = mg

10 What is the weight of Mark on Earth if his mass is 72-kg? m=72 kg a=9.8 m/s 2 W=mg W= (72 kg)(9.8 m/s 2 ) W=710 N

11 Newtons 3 rd Law of Motion For every action, there is an equal and opposite reaction. Law of Action and Reaction

12 Action-Reaction Forces always occur in pairs. Whenever a force is exerted, another force occurs that is equal in size an opposite in direction.


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