Forces in Motion What Do You Think? Explain what you know about Newton’s Laws of Motion.
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Transcript of Forces in Motion What Do You Think? Explain what you know about Newton’s Laws of Motion.
Forces in Motion
What Do You Think?
Explain what you know about Newton’s Laws of
Motion.
Forces in Motion
Newton’s Laws of Motion
http://academic.brooklyn.cuny.edu/history/virtual/portrait.htm
In 1686, Sir Isaac Newton explained the relationship between force and motion with his three laws of motion.
Forces in Motion
Newton’s First Law of Motion
1. An object at rest remains at rest until its acted on by an unbalanced force.
2. An object stays in motion at the same speed and in the same direction until its acted on by an unbalanced force.
Forces in Motion
http://www.physicsclassroom.com/mmedia/newtlaws/efarm.htl
How does this illustrate Newton’s First Law?
Forces in Motion
Newton’s First Law is also called the Law of Inertia.
Inertia is the tendency of all objects to resist any change in motion.
Forces in Motion
Newton’s First Law is also called the Law of Inertia.
Example…your mom makes a sharp left turn in the car…you slide toward the door.
Forces in Motion
Newton’s Second Law of Motion
When applying the same force on an object, as an acceleration increases, its mass decreases.
Forces in Motion
Newton’s Second Law of Motion
If you are applying the same force on an object, an objects acceleration decreases as its mass increases.
Forces in Motion
Newton’s Second Law continued…
• An object’s acceleration increases as the force on the object increases
• An object’s acceleration decreases as the force on an object decreases.
Forces in Motion
Activity
Tell your neighbor 2 ways a grocery store shopping cart could illustrate Newton’s Second Law?
Forces in Motion
Newton’s Third Law of Motion
• All forces act in pairs.
• If a force is exerted, another force is exerted that is equal in size, but opposite in direction to the first force.
Forces in MotionClick below to see examples of
Newton’s Third Law
http://www5.unitedstreaming.com/index.cfm
Forces in MotionNewton’s Third Law also deals with
momentum• Momentum is a property of a moving
object.• Momentum depends on the objects
mass and velocity.• If a small car and a large truck are both
traveling down the highway at the same velocity, the truck has more mass, therefore it will have more momentum.
Forces in Motion
Momentum is Conserved
When a moving object hits another object, the momentum of the first object transfers to the second object.
Forces in Motion
Momentum is Conserved
• Example:–When one pool ball hits another
pool ball on a pool table, the momentum of the first ball is transferred to the second ball as it hits.
Forces in Motion
The momentum of this truck is transferred to this car.
http://www.physicsclassroom.com/mmedia/momentum/trece.html