so who was sir issac newton??
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Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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October 13, 2015
So Who was Sir Issac Newton??Sir Isaac Newton (16421727), an English physicist and mathematician, was one of the most brilliant scientists in history. Before age 30, he had made several important discoveries in physics and had invented a new kind of mathematics called calculus. Newton’s three laws of motion are probably the most widely used natural laws in all of science. The laws explain the relationships between the forces acting on an object, the object’s mass, and its motion.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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October 13, 2015
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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A force is a push or pull, or any action that has the ability to change motion.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Once the ball is moving, it will continue to move in a straight line at a constantspeed, unless another force changes its motion. *You need force to start thingsmoving and also to make any change to their motion once they are moving.*Forces can be used to increase or decrease the speed of an object, or to change the direction in which an object is moving.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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How is force created?
1) your muscles createforce when you swing the golf club.
2)On a windy day, the movement of air can createforces.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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There can be no change
in motion without
the presence of a force.
What is going on in this picture?
EXPLAIN THE FORCES AT WORK
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An object at rest will stay at rest and an object inmotion will continue in motion with the samespeed and direction UNLESS acted on by a force.
PUT AN X THROUGH THE 1st BOX
NEWTON's 1st LAW:
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Inertia is the property of an object that resists changes in its motion. Objects with more mass have more inertia and are more resistant to changes in their motion.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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What is Heavier
100 kilograms of 100 kilograms of Rocks
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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If you are mailing a package at the post office, how does the clerk know how much to charge you?
The package is placed on a scale and you are charged based on the package’s weight. For example, the scale shows that the packageweighs 5 pounds.
The pound is a unit of force commonly used in the United States.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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When you measure weight in pounds on a scale,you are measuring the force of gravity acting on the object
The newton ﴾N﴿ is the metric unit of force.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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When you hit a golf ball, the force from the club is not the only force that acts. What other force is there?
Net force is used to describe the total of all forces acting on an object.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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When two forces are in the same direction, the net force is the sum of the two
Think about 2 people pushing a box:
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2.2 Acceleration and Newton’s Second Law
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What happens if you coast on a bicycle down a long hill without pedaling?
As you go down the hill, your speed getsfaster and faster—you accelerateAcceleration is the rate at which your
speed increases.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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What do we think the rate of
acceleration is for each rider?
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Calculating Acceleration
V1= Start Speed
V2 = End Speed
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When accelerating from 0 to 60 mph,
what is the car's
rate of acceleration?
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s.
But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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A skydiver jumps out of an airplane. After 3 seconds, his velocity is measured to be 99 m/s. Calculate the acceleration for the skydiver?
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Newton’s second law relates the net force on an object, the mass of the object, and acceleration.
vs.
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1. The net force is what causes acceleration.2. If there is no acceleration, the net force must be zero.3. If there is acceleration, there must also be a net force.4. The force unit of newtons is based on kilograms, meters, and seconds.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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NEWTONS 2nd LAW
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ACTIVATORWRITE THIS DOWNWhen you hit a golf ball, what is going to happen. List the events in order... 1st your muscles swing the club2nd3rd4th 5th 6th
https://www.youtube.com/watch?v=08BFCZJDn9w
WATCH T
HIS
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NEWTONS 2nd LAW
The second law states that the acceleration of an object is dependent upon two things
1) the net force acting upon the object 2) the mass of the object.
Unit 2 Notes 2.12.2 2.3 2.4 (3).notebook
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WRITE
THIS WRITE THIS
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To Find Acceleration we divide Force by Mass
To Find MASS we Divide Force by Acceleration
To Find Force we Multiply Acceleration by Mass
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TRY AND EXPLAIN WHAT IS HAPPENING IN THE PICTURE??The rubber band has energy because it is stretched.When you let the car go, the energy of the rubber band is transferred to thecar. The transfer of energy from the stretched rubber band to the car occursthrough the force that the rubber band exerts on the car
https://www.youtube.com/watch?v=qu_P4lbmV_I
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NET Force is all the forces acting upon an object
A Balanced force has 2 or more forces acting equally,the object will not move.
Unbalanced Forces are when one force is stronger in one direction than the other force or forces.
EX/ Pushing a cart
Ex/ A hat on your head
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2.3 Gravity and Free Fall
Vocabulary
free fall, acceleration due to gravity,velocity, weight, air resistance,terminal speed
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An object is in free fall if it is accelerating due to the force of gravity and noother forces are acting on it.
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