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![Page 1: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/1.jpg)
TITLE: P2 Revision 11A5
Objectives• How do we measure the extension of an object
when stretched? – grade C• What is the spring constant of a spring? – grade C• What is Hooke’s law? – grade C
KEY WORDS:
StretchSquash
ExtensionEnergySpring
constant force
NewtonsMetre
ExtensionProportional
Limit of proportionalit
y
Outcomes:• Use the revision PowerPoint to complete the set
activities in preparation for your mock examination
• Complete the terminal velocity card sort with Mrs Potts
![Page 2: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/2.jpg)
What is meant by Resultant Force?(Use to help with slide 3 and 4)
The differences between the forces acting on an object to create an overall single force.
Resultant Force = zero when an object is stationary or at a constant speed if moving
Resultant Force = not zero when an object is accelerating or decelerating
![Page 3: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/3.jpg)
What is the resultant force for each car?
A =
B =
![Page 4: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/4.jpg)
DESCRIBE the motion of each car and EXPLAIN why?
A =
B =
![Page 5: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/5.jpg)
Why have speed limits?
The faster a vehicle is driving, the longer it will take to stop – the overall distance this takes is the stopping distance.
stopping distance = t_______ distance + b_____ distance
![Page 6: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/6.jpg)
What affects thinking distance?The thinking distance is the distance a vehicle travels in the time it takes for a driver to react to a situation and apply the brakes.
What factors will affect thinking distance? – 3 images
![Page 7: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/7.jpg)
Is a tired driver as dangerous as a drunk driver?
• http://www.bbc.co.uk/learningzone/clips/risks-of-driving-when-tired/8323.html
![Page 8: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/8.jpg)
What affects braking distance?The braking distance is the distance a vehicle takes to stop once the driver has applied the brakes.
What factors will affect braking distance? – 3 images
![Page 9: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/9.jpg)
Factors affecting stopping distances
![Page 10: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/10.jpg)
What does the graph show?
![Page 11: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/11.jpg)
What is the difference in speed of the cars?
![Page 12: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/12.jpg)
Velocity time graphs – label the points
• A• B• C
Acceleration
Deceleration
Constant speed
A
B
C
![Page 13: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/13.jpg)
Investigation
• What is meant by extension?
![Page 14: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/14.jpg)
Limit of proportionality?
• What is meant by this term?
• Label with a star the limit of proportionality on the rubber band and polythene strip
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Hooke’s Law
• The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded:
Formula:• F = k x e– F is the force in newtons, N– k is the spring constant in newtons per
metre, N/m– e is the extension in metres, m
![Page 16: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/16.jpg)
The spring constant
• The spring constant is the force per unit extension needed to extend the spring, assuming you do not exceed the limit of proportionality.
• The stiffer a spring is, the g_____ its spring constant.
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Complete the example (grade C)
• A spring has a spring constant of 25 N/m. How much force is needed to extend the spring by 0.1m?
• F = k x e• F =
![Page 18: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/18.jpg)
Using bbc bitesize (grade C)
• Resaerch the equations and UNITs for each one and an example calculation:
• Momentum equation• Work done equation• Weight equation
![Page 19: TITLE: P2 Revision 11A5 Objectives How do we measure the extension of an object when stretched? – grade C What is the spring constant of a spring? – grade.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649cf45503460f949c1ed8/html5/thumbnails/19.jpg)
• Print out the handout as a revision tool