Newton’s 1 st Law

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# Newton’s 1 st Law - PowerPoint PPT Presentation

Newton’s 1 st Law. Sir Isaac Newton. (1642 – 1727)- English Scientist who developed the 3 Laws of Motion which explains: Objects at rest Constant motion Accelerated motion Balanced and unbalance forces &amp; how they cause these states of motion. Newton’s 1 st Law of MOtion.

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Presentation Transcript

Sir Isaac Newton

• (1642 – 1727)- English Scientist who developed the 3 Laws of Motion which explains:
• Objects at rest
• Constant motion
• Accelerated motion
• Balanced and unbalance forces & how they cause these states of motion

Newton’s 1st Law of MOtion

• Newton’s 1st Law: an object at rest will remain at rest, and an object is motion will remain in motion at a constant velocity unless an unbalanced force acts upon it.
• Also known as the Law of Inertia

What are Forces

• Force is a push or a pull that affects matter. Forces can start, stop, accelerate, or change directions of an objects motion
• Force is measured in Newtons
• So if it is unbalanced then that means one forces is greater than another force acting on the same object
Gravity as an unbalanced force
• If gravity is the unbalanced force on an object the object is said to be in Free Fall
• So why are we not always in free fall?
• When we stand on the ground gravity’s force pulls us down and the floor’s force pushes up
Inertia
• Inertia- This is the tendency of objects to remain in motion or to stay at rest
• In short it means an objects resistance to change its state of motion

Examples:

Car accident- Seat Belts

Book on a desk

Roller skating

Roller coaster turning

More Inertia
• Is the inertia the same for a fly as a train?
• No the train has more inertia
• BECAUSE the train has more mass
• The more mass you have the more inertia you have

This is different from momentum. An object at rest has no momentum but it does have inertia.

Circular Motion
• Centripetal acceleration- the acceleration of an object moving in a curved path or circle.
• Centripetal force- the force that causes an object moving at a constant speed to move in a curved path or circle.