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# Sir Isaac Newton and Forces - PowerPoint PPT Presentation

Sir Isaac Newton and Forces. Physicists 1643-1727. The Telescope.

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### Sir Isaac Newtonand Forces

Physicists

1643-1727

• Newton’s first major achievement was the invention, design, and making of a reflecting telescope. It was an advancement in telescope technology because the mirror gave a better image than a larger lens. It focuses different colors at different distances.

1st Law of Motion

With no outside force the ball will never move

• Newton’s first law of motion: Every object in the same motion tend to stay in that state of motion unless an external force is applied to it.

2nd Law of Motion

The relationship between an object's mass, its acceleration , and the applied force F is F = ma.

When the net force acting on an object is zero then it will accelerate with the

applied force

More force more acceleration

3rd Law of Motion

• For every action there is an equal and opposite reaction

Reaction force of the book to the apple

Force of attraction between the apple and the earth

• The acceleration depends upon the mass of the earth and the distance the other mass is from the center of the earth.

• In 1664 Newton read work on optics by Robert Boyle and Hooke.

• He himself discovered white light to be a mixture of different color rays.

• He concluded that light was made up of streams of minute particles

• A prism transforms white light into many colors

• The rate of heat lost of a body is proportional to the differences in temperatures between the body and its surroundings

Ex. Heat a thermometer and record the rate the temperature drops

• Calculus discovered by Isaac Newton and Wilhelm Leibniz

• Newton’s ideas based more on limits and reality while Leibniz focused on infinite and the abstract

• There are debates over who discovered it first

• Newton’s work was published 1687

• Calculus is a branch of math focusing on limits, functions and integrals.

• Differential calculus and integral calculus

• A force is something that causes an object to accelerate

• Net force is the sum of all forces acting on an object.

• The normal force acts on an object that touches surface

• Ex. Normal force affects a ball on a table but not a ball in the air

• Fn=-mg

• Contact Forces- contact between objects

• Field Forces- no physical contact

• Force is a Vector

• Friction is the force that acts between two objects because of action-reaction

• Static Friction- force of friction between objects when there is no motion

• Kinetic- force of friction between objects when there is motion