Aims… (Triple Only)
1.25P know and use the relationship between momentum, mass and velocity:
momentum = mass × velocity OR p = mv
1.26P use the idea of momentum to explain safety features
1.27P use the conservation of momentum to calculate the mass, velocity or momentum of objects
1.28P use the relationship between force, change in momentum and time taken:
force = change in momentum/time taken
F = (mv-mu)/t
1.29P demonstrate an understanding of Newton’s third law.
1.30P know and use the relationship between the moment of a force and its distance from the pivot:
moment = force × perpendicular distance from the pivot
1.31P know that the weight of a body acts through its centre of gravity
1.32P use the principle of moments for a simple system of parallel forces acting in one plane
1.33P understand how the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam.
Resources
This PowerPoint of resources covers most of the key ideas in the unit…
Extra Resources
Video Clips…
Moments and Centre of Mass of a Bird iGCSE Physics COM
In Physics, the centre of mass of (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. ...
In the case of a single rigid body, the centre of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centre. The centre of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe.
In the case of a distribution of separate bodies, such as the planets of the Solar System, the centre of mass may not correspond to the position of any individual member of the system.
In terms of this bird the COM occurs on the tip of the birds nose as the wings are weighted with moments to counterbalance the tail mass. There would be one moment acting at the tail of force x distance. This counterposes the force x distance of each of the wing weights. They act around the pivot point of the nose to balance out.
The principle of moments is that the anticlockwise moments balance the clockwise moments for an object in equilibrium.Show MoreMoments and Centre of Mass of a Bird iGCSE Physics COM
In Physics, the centre of mass of (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. ...
In the case of a single rigid body, the centre of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centre. The centre of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe.
In the case of a distribution of separate bodies, such as the planets of the Solar System, the centre of mass may not correspond to the position of any individual member of the system.
In terms of this bird the COM occurs on the tip of the birds nose as the wings are weighted with moments to counterbalance the tail mass. There would be one moment acting at the tail of force x distance. This counterposes the force x distance of each of the wing weights. They act around the pivot point of the nose to balance out.
The principle of moments is that the anticlockwise moments balance the clockwise moments for an object in equilibrium.Show More BBC Horizon - Crash
Horizon documentary detailing the death toll that has resulted from the car and some of the innovations developed to make them less lethal.
Smart Car Crash Test #TBT- Fifth Gear
It's #ThowbackThursday! the gang decide to crash test the Smart Car. With an NCAP rating of 3 out of 5 stars can the little compact withstand a 70mph crash into ...re-enforced concrete barriers?
For more fantastic car reviews, shoot-outs and all your favourite Fifth Gear moments, subscribe to our Official Channel - https://www.youtube.com/user/fifthgearukShow More GCSE Physics Revision "Conservation of Momentum" (Triple)
Momentum (Explosion: Canon) | GCSE Physics
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✨ A FRESH and NEW study ...and revision platform ✨Show More Impulse and Change in Momentum - GCSE & A Level Physics
Why do you have to wear a seat belt in a car? Why is a car designed with a crumple zone? Impulse is equal to force times time. If you ...increase the time of impact, then the force will be reduced in a crash.
Music credit:
Song: Dipcrusher - Islands (Vlog No Copyright Music)
Music provided by Vlog No Copyright Music.
Video Link: https://youtu.be/CpFneq3zIt4Show More Centre of Mass | GCSE Physics | Doodle Science
GCSE Science
Doodle Science teaches you high school physics in a less boring way in almost no time!
Follow me: https://twitter.com/DoodleSci
You can support me at: https://patreon.com/doodlescience
Script:
The centre of mass of an object ...is the point where the entire weight of an object appears to act. Working out the centre of mass of a symmetrical object is easy; it’s simply the point where the lines of symmetry cross.
However it’s very unlikely that you’ll be dealing with such perfect shapes so you work it out by suspending the object freely, along with a plumb line. The centre of mass is always below the point of suspension, so by marking the vertical along the plumb line you know the centre of mass is somewhere along that line. By suspending the object from another point and repeating the process, you get two lines that intersect and the point of intersection is the centre of mass.
The position of the centre of mass is very important when it comes to the stability of an object. For example, a double decker bus is built to have a very low centre of mass and a wide base so that the line of action of its weight stays within the base when it goes around a sharp corner. If something has a high centre of mass combined with a small base then it is very unstable and will topple over with minimal effort.
A plumb line is an example of a simple pendulum. All it consists of is a weight attached to a piece of string that can swing freely. The time taken for it to swing from one side to the other and back again is called the time period. The time period of a pendulum of the same length is always the same no matter what height you release it from, which is what makes them so good at keeping time. The time period and the frequency are related by the formula: T = 1/f. So if a pirate ship at a theme park swung with a frequency of 0.2Hz then the time period would be 5s, which is one scary ride!
References:
1. http://www.bbc.co.uk/education/subjects/zrkw2hv
2. CGP GCSE Physics AQA Revision Guide.Show More Moments | GCSE Physics | Doodle Science
GCSE Science
Doodle Science teaches you high school physics, in a less boring way, in almost no time!
Follow me: https://twitter.com/DoodleSci
You can support me at: https://patreon.com/doodlescience
Script:
A moment is the turning effect of ...a force. It’s calculated by multiplying the force by the perpendicular distance between the force and the pivot. For example, by turning a spanner you are producing a moment. If you apply a force of 15N to the end of the spanner and the length of it is 0.1m, then the moment you are applying is 1.5Nm.
However you can apply a force that is not perpendicular, in which case the distance is not the length of the spanner but is the distance from the line of action of the force to the pivot. This will produce a smaller moment, so to produce the maximum moment, you need to apply force at 90 degrees.
Moments are often referred to as force multipliers because they reduce the force needed to perform certain tasks. You’ve probably all experienced this at some point in your lives but haven’t realised the reason why. Using a wheelbarrow is an example of a lever being used to reduce the effort necessary to lift the load. It works using the concept of balanced moments. An object is balanced when the sum of the clockwise moments about a pivot are equal to the sum of the anticlockwise moments about the same pivot.
For example, if a force of 300N is applied 2m from the pivot, and another force of 700N is applied on the other side of the pivot then it must be applied 0.86m from the pivot in order for the moments to balance. This means that you can apply small forces at further distances to achieve much greater forces on the other side. Which is why you’ll find it much easier to close your door from the handle rather than near the hinges.
References:
1. http://www.bbc.co.uk/education/subjects/zrkw2hv
2. CGP GCSE Physics AQA Revision Guide.Show More Newton's Third Law Part 1 Physics Lessons
http://www.physicshelp.ca
GO AHEAD and click on this site...it wont hurt.
Free simple easy to follow videos all organized on our website
Key Words: Newton's third 3rd law dynamics mechanics free body diagrams physics ... lesson help fbd explained action reaction applied forceShow More Practical C2 Finding mass of metre rule using POM
Defying Gravity While Balancing Forks!! (Scientific Experiment)
Today we have a fun home experiment in which we will defy gravity while balancing forks. A fun home experiment that I encourage you try with your family and ...leave them in awe.
Everything you will need for this experiment can be found around the house:
-Glass Cup
-2 Forks
-Tooth Pick
-Lighter/Matchers
Instructions:
1. Interlock your 2 forks
2. Stick the toothpick through the center tightly
3. Balance the forks and toothpick on the edge of the glass
4. Take a moment to be amazed at the forks balancing on a tiny toothpick
5. Take your lighter and lite the end of the toothpick until it burns all the way to the glass
So have fun and make sure you subscribe for more cool experiments! =)Show More Physics behind balancing fork trick
Created by 301 Wen Hui
A Common Misconception about Newton's Third Law Force Pairs (or Action-Reaction Pairs)
Looking for AP Physics 1 study guides, multiple choice problems, free response question solutions and a practice exam? https://www.ultimatereviewpacket.com/courses/ap-physics-1
Just because two forces are equal in magnitude and opposite in direction ...doesn't make them a Newton's Third Law Force Pair - this video proves it with a book resting on a table. The force normal (up) and the force of gravity (down) acting on the book do satisfy that magnitude-and-direction relationship, but they're not a Third Law Force Pair, because both forces act on the same object, the book, and Third Law Force Pairs always act on two different objects. The book's actual force pairs are: the table's upward push on the book pairs with the book's downward push on the table, and the Earth's downward pull on the book (the force of gravity) pairs with the book's upward pull on the Earth.
0:00 Intro, and drawing the free body diagram
1:02 Why the Force Normal and Force of Gravity aren't a Newton's Third Law Force Pair
1:37 Finding the actual force pairs
Want Lecture Notes?
http://www.flippingphysics.com/third-law-misconception.html
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Understanding the Force of Tension
http://www.flippingphysics.com/tension-force.html
- Los subtítulos de este video de "Flipping Physics" han sido traducidos al Español. Gracias Anwar Delgado Sliva!
Previous Video:
Introduction to Newton's Third Law
http://www.flippingphysics.com/third-law.html
#NewtonsThirdLaw #ForcePairs #FreeBodyDiagram
Curriculum Standards:
AP Physics 1, Topic 2.3 Newton's Third Law
2.3.A.1: "Newton's third law describes the interaction of two objects in terms of the paired forces that each exerts on the other."
AP Physics C: Mechanics, Topic 2.3 Newton's Third Law
2.3.A.1: "Newton's third law describes the interaction of two objects or systems in terms of the paired forces that each exerts on the other."
Cambridge International A Level Physics (9702), Topic 3.1 Momentum and Newton's laws of motion
3.1.5: "state and apply each of Newton's laws of motion."
IB Physics, A.2 Forces and momentum
A.2 (Understandings) [Newton's Laws]: "Newton's three laws of motion."
JEE Main, Unit 3 Laws of Motion
"Force and inertia, Newton's first law of motion, momentum, Newton's second Law of motion, impulse, Newton's third Law of motion."
NEET, Unit 3 Laws of Motion
"Force and inertia, Newton's First law of motion; Momentum, Newton's Second Law of motion, Impulses; Newton's Third Law of motion."
Ontario Physics SPH3U, Strand C Forces
C3.3 (SPH3U): "state Newton's laws, and apply them, in qualitative terms, to explain the effect of forces acting on objects."
Ontario Physics (SPH4C), Strand B Motion and Its Applications
"B3.4 (SPH4C): state Newton's laws, and apply them qualitatively and quantitatively to explain the motion of an object in one dimension"
Australian Curriculum Physics, Unit 2: Linear Motion and Waves
ACSPH063: "Newton's Three Laws of Motion describe the relationship between the force or forces acting on an object, modelled as a point mass, and the motion of the object due to the application of the force or forces."
MCAT, Content Category 4A: Translational Motion
4A (PHY topic list) [Newton's Third Law]: "Newton's Third Law, forces equal and opposite."
Gaokao (China), Compulsory Module 1, Topic 1.2 Interactions and Laws of Motion
C1.2.3: "Through experiments, explore the relationship between an object's acceleration and the force(s) acting on it and its mass. Understand Newton's laws of motion and use them to explain phenomena and solve problems in daily life. Through experiments, understand apparent overweight and weightlessness."Show More
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