Newton's Laws and Linear Momentum - Revision history

Lkrishnan7: /* Elastic Collision: */

2017-04-09T02:50:42Z

Elastic Collision:

← Older revision		Revision as of 22:50, 8 April 2017
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	Some of the velocity of the bus was given to the lady, which caused her to go flying and land on the other side of the road. This is common of road traffic accident and this redistribution of momentum, in the form of velocity, is where part of her injury comes from.		Some of the velocity of the bus was given to the lady, which caused her to go flying and land on the other side of the road. This is common of road traffic accident and this redistribution of momentum, in the form of velocity, is where part of her injury comes from.

			==Resources==

			https://www.youtube.com/watch?v=gVTOf33UlDA

			http://www.physicsclassroom.com/class/momentum/u4l2b.cfm

			http://www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law

			http://teachertech.rice.edu/Participants/louviere/Newton/law2.html

			http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law

			http://www.physicsclassroom.com/class/newtlaws/Lesson-1/Inertia-and-Mass

			http://www.physicsclassroom.com/mmedia/energy/cs.cfm

			http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html#c1

			http://www.physicsclassroom.com/class/momentum/u4l2b.cfm

			http://www.laserpablo.com/teacherresources/files/APLabs_CCPhysics/10-Billiard_Ball_Physics.pdf

			http://hyperphysics.phy-astr.gsu.edu/hbase/inecol.html#c1

			http://hyperphysics.phy-astr.gsu.edu/hbase/impulse.html#c1

			http://hyperphysics.phy-astr.gsu.edu/hbase/seatb.html#cc1

			http://hyperphysics.phy-astr.gsu.edu/hbase/work.html#wepr

			http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html#c1

			https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/introduction-to-work-and-energy

Lkrishnan7: /* Newton’s 2nd Law: */

2017-04-09T02:45:59Z

Newton’s 2nd Law:

← Older revision		Revision as of 22:45, 8 April 2017
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	'''Witness Statement:''' As a lady cruised by in her Honda Civic, she momentarily took her eyes off the road, and found her car in front of a lamppost and crashed into it.		'''Witness Statement:''' As a lady cruised by in her Honda Civic, she momentarily took her eyes off the road, and found her car in front of a lamppost and crashed into it.

	'''Report''': This case is a Newton’s 2nd law case. According to the law, F = MA, which means that F = M x (ΔV / ΔT), or F = M((Vf -Vi) / T)		'''Report''': This case is a Newton’s 2nd law case, and impluse. According to the law, F = MA, which means that F = M x (ΔV / ΔT), or F = M((Vf -Vi) / T)
	F ΔT = M(Vf - Vi)		F ΔT = M(Vf - Vi)
	The extent of her injury is determined by the force that hit her. So, the size of the force she’s subjected to is determined by the interaction time. If the T becomes smaller, the force is bigger; if T is bigger, the force gets smaller. The sudden change of velocity also played a part in her injury. The car should’ve had safety features that made the interaction time as long as possible, because if you can spread the reaction time, you can do the deceleration with a smaller force - We can reduce the size of the force if we reduce the time.		The extent of her injury is determined by the force that hit her. So, the size of the force she’s subjected to is determined by the interaction time. If the T becomes smaller, the force is bigger; if T is bigger, the force gets smaller. The sudden change of velocity also played a part in her injury. The car should’ve had safety features that made the interaction time as long as possible, because if you can spread the reaction time, you can do the deceleration with a smaller force - We can reduce the size of the force if we reduce the time.
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	80000 / 1 = 80,000 newtons, or 8.96 tons!		80000 / 1 = 80,000 newtons, or 8.96 tons!

	'''Conclusion''': Thus, the “crumple zones” in the front of the car, and the airbags came in handy, because rather than allowing sudden stop, the car was allowed to halt over a larger period of time, making the force less than it would’ve been without them.		'''Conclusion''': Thus, the “crumple zones” in the front of the car, and the airbags came in handy, because rather than allowing sudden stop, the car was allowed to halt over a larger period of time, making the force less than it would’ve been without them. Thanks, impulse!


	===Inertia / Newton’s 1st Law: ===		===Inertia / Newton’s 1st Law: ===

Lkrishnan7: /* Linear Momentum */

2017-04-09T02:43:44Z

Linear Momentum

Show changes

Mlamarca3: Created page with " == Linear Momentum == Linear momentum, denoted by the letter '''p''', is a vector quantity which represents the product of an object's velocity, '''v''', and mass, '''m''',..."

2015-11-30T15:04:22Z

Created page with " == Linear Momentum == Linear momentum, denoted by the letter '''p''', is a vector quantity which represents the product of an object's velocity, '''v''', and mass, '''m''',..."

New page

== Linear Momentum ==

Linear momentum, denoted by the letter '''p''', is a vector quantity which represents the product of an object's velocity, '''v''', and mass, '''m''', as it moves along a straight line. As a vector quantity, an object's linear momentum possesses momentum and direction and is therefore always in the same direction as its velocity vector. Linear momentum can be expressed by the equation: '''p = mv'''

[[File:Momentum_pic.jpg]]

When an object is moving, it has a non-zero momentum. If an object is standing still, then its momentum is zero.

By Newton's Second Law, '''F=ma''', the conservation of linear momentum is supported. Since acceleration can be expressed as ∆v/∆t, Newton's Second Law could therefore be expressed as '''F = m∆v/∆t'''. Since '''m∆v''' is equal to momentum, '''p''', an expression of Newton's Second Law can be expressed in terms of momentum as '''F=∆p/∆t'''. In many ways, this expression of Newton's Second Law is more versatile than the equation F=ma, because it can be used to analyze systems where the velocity changes and the mass of a body changes. For instance, it can be applied to a motorcycle burning fuel by taking in to account not only the velocity change, but also the change in the mass of the body, which in this case would be the fuel burning and thus lowering the total body mass of the motorcycle.

Newton's laws of motion also play a role in supporting the [[law of conservation of linear momentum]]. Linear momentum is a conserved quantity, and therefore in a closed system (a system that does not allow transfers of mass or energy into or out of the system), the total momentum of the system will not change. This allows one to calculate and predict the outcomes when objects bounce into one another. Or, by knowing the outcome of a collision, one can reason what was the initial state of the system.