Newtons Law Of Motion Essay, Research Paper

Newtons Laws of Motion

Research-Physical Science

1st Year Senior School

1. Who was Isaac Newton?

Sir Isaac Newton was born in Woolsthorpe, near Grantham in Lincolnshire. He was delivered in 1642 and lived as a famous mathematician and physicist until 1727. He also attended school in Lincolnshire, after his graduation he entered Cambridge University in 1661. He then became one of the worlds most reputable and foremost scientific intellects of all time. He was then elected a Fellow of Trinity College in 1667, and Lucasian Professor of Mathematics in 1669. He remained at the university lecturing in most years, until 1696. While studying at Cambridge he singled out the years of 1665-1666, in which Newton was at the height of his creative power, at this time in his life we was at the prime of my age for invention .

2. What other studies did he conduct, besides from the motion of objects?

Optics:

In 1664, while still a student, Newton read recent work on optics and light by the English physicists Robert Boyle and Robert Hooke; he also studied both the mathematics and the physics of the French philosopher and scientist Ren Descartes. He investigated the refraction of light by a glass prism.

Mathematics:

Newton discovered measurable, mathematical patterns in the phenomenon of colour. He found white light to be a mixture of infinitely varied coloured rays, each ray definable by the angle through which it is refracted on entering or leaving a given transparent medium. He correlated this notion with his study of the interference colours of thin films using a simple technique of extreme acuity to measure the thickness of such films. He held that light consisted of streams of minute particles. From his experiments he could infer the magnitudes of the transparent corpuscles forming the surfaces of bodies, which, according to their dimensions, so interacted with white light as to reflect, selectively, the different observed colours of those surfaces.

3. Newtons first Law of Motion?

An object continues in its state of rest or uniform motion in a straight line unless acted on by net external force.

Example:

An object in motion tends to stay in motion, and an object at rest tends to stay at rest unless the object is acted on by an outside force.

One of the most common places people feel the First Law is in a fast moving vehicle, such as a car or a bus, that comes to a stop. An outside force stops the vehicle, but the passengers, who have been moving at a high speed, are not stopped and continue to move at the same speed. Below is an example of this:

The crash dummy is not wearing a seat belt and is moving along with the car. Both the car and the dummy are moving at 60 mph. When the car hits the cement road divider it is stopped (an outside force stops it from moving). The crash dummy, however, is not so lucky. Since he is not wearing a seat belt, and is not connected to the car, he will continue to move at 60 mph. This means he will go flying out through the front windshield. The dummy will fly through the air until he hits the ground. This is because the earth’s gravity stopped him from moving any further. If this collision had happened in zero-g, in a vacuum, the dummy theoretically would keep on hurtling away from the car at 60 mph.

4. What is inertia ?

Newton s first law is also known as the law inertia. Inertia is the tendency of a body to remain in its state of motion. The greater the mass of a body the greater is its inertia.

5. What is the Second Law of Motion? Give examples and formula?

When a net force acts on a body the body is accelerated in the direction of the force. The acceleration is directly proportional to the force and inversely proportional to the mass of a body.

Mathematically this law can be expressed as:

Acceleration= Force

———-

Mass

Example: Everyone unconsciously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance than do lighter objects. The Second Law, however, gives us an exact relationship between force, mass, and acceleration. Below is an example of how Newton’s Second Law works:

Thevins car, which weighs 1,000 kg, is out of gas. Thevin is trying to push the car to a gas station, and he makes the car go 0.05 m/s/s. Using Newton’s 2nd Law, you can compute how much force Thevin is applying to the car

M=1000 kg F = M x A

A=0.05m/s/s = 1000 x 0.05

F=? = 50 Newtons

6. Write a question that relates to the Second Law of Motion. Answer your question and don t forget to set it out properly?

Kieran s kombi van, which weighs 4,000 kg, has a broken Fretz. Kieran is trying to push the car to a mechanic station, and he makes the car go 0.4 m/s/s. Using Newton’s 2nd Law, you can scientifically work out how much force Kieran is applying to the van.

M=4000 kg F = M x A

A=0.4m/s/s = 4000 x 0.4

F=? = 1600 Newtons

7. What is the Third Law of Motion? Give examples.

Whenever a body exerts a force on another body this second body exerts a force equal in magnitude but opposite in direction to the first

Kieran is tired of pushing his van to the mechanic station. He gets an idea — “Hey! I go much faster when I am roller-blading than when I am walking. Why don’t I wear my roller-blades!” So Kieran gets his roller blades from the back of his van, and starts pushing. Since every action has an equal and opposite reaction, when Kieran pushes the van, the van pushes Kieran. Kieran weighs 50 kg, and the van weighs 2,000 kg. Thanks to the Second Law of Motion, you can compute how much Kieran and the van will move after 1 second.

A=F/M A =F/M

A=100/50 =100/2000

A=2m/s/s =0.05m/s/s

8. How is the bouncing of a basketball an example of Newtons Third Law?

When you bounce a ball you apply a certain amount of force, when the ball strikes the ground an equal force is applied in the opposite direction, causing the ball to bounce up.

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