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# Newtons Laws

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## Nicole T

on 27 September 2012

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#### Transcript of Newtons Laws

Newton's Laws By Nicole, Brianna, and Emily Newton's First Law Gravity Newton's first law states that objects at rest stay at rest and objects in motion remain in motion unless acted upon by an unbalanced force.

An object at rest will stay at rest if no force is acted upon is.

An object in motion will stay in motion unless an unbalanced force disturbs it. Newton's Second Law: Acceleration and Mass The acceleration of an object increases with increased force, and decreases with increased mass. Also, whichever way the force moves the object, the object will move in the same direction. If an object has less mass, it will have more acceleration. If it has more mass, it will have less acceleration.

If the force that is pushing the object is smaller, the object will have less acceleration. If there is a bigger force trying to push that same object, it will have more acceleration. (same size) Ex.) More mass = less acceleration, less mass = more acceleration (same force) force force acceleration acceleration (less mass) (more mass) Ex.) Less force = less acceleration, more force = more acceleration (same mass) macho muscle guy weak person force force acceleration acceleration Glossary Force- a push or pull.
Net Force- the overall force acting on an object when all the forces acting on it are combined.
Acceleration- the rate at which velocity changes over time.
Gravity- the force that objects exert on each other because of their masses.
Mass- a measure of how much matter an object is made of
Issac Newton- supposedly the greatest and most influential scientist who ever lived. He was also the person to discover the three laws of motion. And other words you should know... and other words you should know... An Example: You're in a car and a squirrel (named Poncho) runs in front of your car. Not wanting to hit it you slam on your brakes. The driver, who was wearing his seat belt, was stopped by the unbalanced force that was his seat belt. However, the passenger, who was not wearing his seat belt, remained in motion until he/ she was stopped by the windshield acting as the unbalanced force. An Example When one object exerts a force on another object, the second object exerts an equal and opposite force on the first person. Newton's 3rd Law An example of this is with a space shuttle. As the shuttle takes off the engine pushes the exhaust down. The exhaust then pushes the shuttle up. Another example is with a jelly fish. As the jelly fish squeezes its body together the water pushes down and in return the jellyfish moves upward. Reaction Force Action Force The reaction force is #1 pushing #2. The reaction force is the one that creates motion off of another force. After pushing #2, #1 got pushed back. The action force from #1 sends #2 moving. #1 #2 Newton's 3rd Law *Words in red= important vocab words found in glossary Who was Sir Issac Newton? The History of Sir Issac Newton: Sir Issac Newton was a famous scientist that studied the effects of force on objects. Newton came up with 3 laws of motion, #1 is Gravity, #2 is Acceleration and Mass, and #3 is Reaction and Action Force. Newton was around in the 1600's, was English and sported an amazing hairdo. "F=ma" Formula F= Force
M= Mass
A= Acceleration What do the letters stand for? : How to calculate force : How to calculate Force, Acceleration, and Mass : You would take the mass of the object, and multiply it by the acceleration of the object. Ex.) mass= 5 kg acceleration= 2 m/s 5 x 2 = 10N How to calculate acceleration: You would want to take the force applied on the object and divide it by the mass of the object. Ex.) mass= 5kg force= 20N 20 __ 5 = 4 m/s How to find the mass of an object : You would take the force applied on the object, and divide it by the acceleration it's traveling Ex.) force= 2N acceleration= .5 m/s 2 -- .5 = 4 kg Why does Mass Matter in a car accident? The smart car has less mass... The Mercedes has more mass... A car crash reminds me of unbalanced force, when one force is greater than the other, causing the object the force is applied on to go in the direction of the greater force. But, in this case, it's mass related. So let's just say that the mass of the Mercedes (Mer.) is 100kg (random number) and the mass of the Smart Car (S.C) is 25kg. Because the Mer. is heavier and bigger than the S.C, its force is going onto the S.C. The S.C. mass isn't bigger enough to move the Mer. , but the Mer. can move the S.C. You can also put it that the Mer.is one force, the greater one, and the S.C. is the lesser one, and there's and imaginery object that both forces are trying to move. of course the object will go in the direction the greater force will push it, but because the force was so big, the S.C. even moves because of it. Are seatbelts important? Why do you need to wear a seatbelt? Seatbelts are lifesavers. In a car crash if you arent wearing your seatbelt you can smash through the windshield because there is nothing there to stop you. If you wear a seatbelt the restraint holds you back and avoids you from hitting anything in your way. Remeber putting on your seatbelt is the first thing you should do when you get into a car and is related to the Newton's first law. Newton's first law explains how an object at rest stays at rest, and an object in motion stays in motion unless either of them are acted upon by an unbalanced force.
The unbalanced force is essentially the force applied that changes the motion of an object. This law is also known as the law of inertia because it explains the resistanceof changes of an object's motion, which is Inertia. Newton's First Law An Example You're in a car and you see a squirrel. Not wanting to hit the squirrel you hit your brakes fast and suddenly stop. The driver is wearing his seatbelt while the passenger is not.

What is the unbalanced force acting for the driver?
a. windsheild
b. friction
c. seatbelt
d. I don't know

The passenger?

a. windsheild
b. friction
c. seatbelt
d. I don't know The answers are
1. C
2. A
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