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P2.1.2 Forces and Motion P2 Physics P2.1.2 Forces and Motion P2 Physics Mr D Powell.

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Presentation on theme: "P2.1.2 Forces and Motion P2 Physics P2.1.2 Forces and Motion P2 Physics Mr D Powell."— Presentation transcript:

1 P2.1.2 Forces and Motion P2 Physics P2.1.2 Forces and Motion P2 Physics Mr D Powell

2 Mr Powell 2012 Index Connection Connect your learning to the content of the lesson Share the process by which the learning will actually take place Explore the outcomes of the learning, emphasising why this will be beneficial for the learner Connection Connect your learning to the content of the lesson Share the process by which the learning will actually take place Explore the outcomes of the learning, emphasising why this will be beneficial for the learner Demonstration Use formative feedback – Assessment for Learning Vary the groupings within the classroom for the purpose of learning – individual; pair; group/team; friendship; teacher selected; single sex; mixed sex Offer different ways for the students to demonstrate their understanding Allow the students to “show off” their learning Demonstration Use formative feedback – Assessment for Learning Vary the groupings within the classroom for the purpose of learning – individual; pair; group/team; friendship; teacher selected; single sex; mixed sex Offer different ways for the students to demonstrate their understanding Allow the students to “show off” their learning Activation Construct problem-solving challenges for the students Use a multi-sensory approach – VAK Promote a language of learning to enable the students to talk about their progress or obstacles to it Learning as an active process, so the students aren’t passive receptors Activation Construct problem-solving challenges for the students Use a multi-sensory approach – VAK Promote a language of learning to enable the students to talk about their progress or obstacles to it Learning as an active process, so the students aren’t passive receptors Consolidation Structure active reflection on the lesson content and the process of learning Seek transfer between “subjects” Review the learning from this lesson and preview the learning for the next Promote ways in which the students will remember A “news broadcast” approach to learning Consolidation Structure active reflection on the lesson content and the process of learning Seek transfer between “subjects” Review the learning from this lesson and preview the learning for the next Promote ways in which the students will remember A “news broadcast” approach to learning

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4 Mr Powell 2012 Index P2.1.2 Forces and Motion a) The acceleration of an object is determined by the resultant force acting on the object and the mass of the object: F = ma b) The gradient of a distance–time graph represents speed. c) Calculation of the speed of an object from the gradient of a distance–time graph. (HT) d) The velocity of an object is its speed in a given direction. e) The acceleration of an object is given by the equation: a = (v – u)/t f) The gradient of a velocity–time graph represents acceleration. g) Calculation of the acceleration of an object from the gradient of a velocity–time graph. (HT) h) Calculation of the distance travelled by an object from a velocity–time graph. (HT) a) The acceleration of an object is determined by the resultant force acting on the object and the mass of the object: F = ma b) The gradient of a distance–time graph represents speed. c) Calculation of the speed of an object from the gradient of a distance–time graph. (HT) d) The velocity of an object is its speed in a given direction. e) The acceleration of an object is given by the equation: a = (v – u)/t f) The gradient of a velocity–time graph represents acceleration. g) Calculation of the acceleration of an object from the gradient of a velocity–time graph. (HT) h) Calculation of the distance travelled by an object from a velocity–time graph. (HT)

5 Mr Powell 2012 Index d) Velocities.... ObjectEst. Velocity m/s Man Comet Concorde Football Bullet Train Snail  Make a table similar to this with and estimate of each objects velocity. Try and order it as fastest first.. Bullet Train = 262km/h or 164mph

6 Mr Powell 2012 Index d) Velocities.... ObjectEst. Velocity m/s Man10 Comet55,555 Concorde666 Football15 Bullet Train73 Snail0.001  Make a table similar to this with and estimate of each objects velocity. Try and order it as fastest first.. To convert km/hour to m/s simply x1000/3600

7 Mr Powell 2012 Index Fill in the gaps.... On the following slides you will see completed motion graphs for; distance – time graphs Fill in the gaps in your worksheet and complete the final box on proper graph paper.

8 Distance - Time

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11 Distance – Time - NB Nothing removed from this one!

12 Distance - Time Now try this journey with several stages....

13 Mr Powell 2012 Index Plot this new graph.....  Now you have seen how a d-t graph is plotted try doing this one yourself and work out the average speed of the car.... Distance (m) Time (s)

14 Mr Powell 2012 Index Distance Time Graphs

15 Mr Powell 2012 Index Plenary Question... The fastest moving man-made object was the Helios 2 space probe. It travelled at about 67 km/s ( m/s), which is Mach 203 (not that sound can travel in space). Space probes can travel so quickly, because there is no air resistance so they do not lose any of their kinetic energy. The probe Voyager 1 is travelling at 17.5 km/s and has been travelling for around 30 years. Answer the question below and write out your working in your book. ‘How far away is it from Earth now?’

16 Mr Powell 2012 Index d) Backwards or Forwards? a)Write down a set of instructions for a person to get from point A to Tesco via two different routes b)Think about the two routes and describe as fully as you can the differences in speeds and direction of the speed 1mile

17 Mr Powell 2012 Index d) Vectors?  On this racetrack a car covers miles in distance by covering a circuit in a lap. After 1 lap the car is back to the start and has completed the lap at a constant speed of 30 mph.  However, when we think of the term “velocity” we describe not just the speed but the direction. In this case the “velocity” changes direction all the time. We call it a vector quantity. This feature is important in helping us describe the motion of objects clearly!

18 Mr Powell 2012 Index Fill in the gaps.... On the following slides you will see completed motion graphs for; velocity – time graphs Fill in the gaps in your worksheet and complete the final box on proper graph paper.

19 Velocity - Time

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23 Now try out this journey with multiple parts...

24 Mr Powell 2012 Index e) Acceleration  A more grown up way to express this is to look at the change in velocity as a Greek “  ” term over the time period.  We can also use the idea of ; v = final velocity u = initial or starting velocity

25 Mr Powell 2012 Index e) Acceleration

26 Mr Powell 2012 Index 1.2 Quick Questions Copy out the questions below and draw a diagram or formulae to help you explain each one. Make sure you do it all on your own! 1.What is the difference between speed and velocity? 2.What is acceleration and what are its units? 3.What is deceleration?

27 Mr Powell 2012 Index Acceleration and Power  What makes a vehicle good at accelerating? There are two main factors; weight & brake horse power (BHP or kW). We can compare different cars by excluding the weight i.e. Diving the Power by the Mass to create a Power to Weight ratio.  Write an article explaining the reason for the 0-60 times for these cars referring to the data shown below. Also the idea of how to use it and power to weight ratios to compare any car. (You can use a table if required) Key words: fair test, variables, power, weight, time, max power, etc... 1 – Saleen S7 Power-to- weight ratio: mph: 2.8 seconds Top speed: 235 mph 2 - Porsche Carrera GT Power-to-weight ratio: mph: 3.9 seconds Top speed: 205 mph 3 - Ferrari 599 GTB Fiorano Power-to-weight ratio: mph: 3.6 seconds Top speed: 205 mph

28 Mr Powell 2012 Index Tortoise & Hare! “Yes Mr Hare you were right he is on steroids!”  In your books sketch a quick graph of a race in which a tortoise and a hare cover the same distance. The tortoise wins the race but the hare has a quicker top speed in parts of the race. You axis should be (0s to 100s and 0m to 1000m)  Try and justify your answer with some maths!

29 Mr Powell 2012 Index Distance Travelled....  We can work out a really cool thing by working out the area under a v-t graph. If we add it all up it actually means the distance covered!  Make a sketch copy of the diagram and work this out for each of the journeys. (with full working)

30 Mr Powell 2012 Index Deceleration in context of a car braking....  This graph is a simple example of a car travelling at 20m/s for a time of 10 seconds.  Then the car brakes / slows down / decelerates at a constant rate till it stops. This takes 5s.  Use the acceleration formula to work out the deceleration. Then write a sentence and draw a sketch graph to match

31 Mr Powell 2012 Index Energy = Power x Time Energy = 145W x 1 hour Energy = 145W x 3600s E = 145J/s x 3600s E = J E = 522kJ 3 Marks

32 Mr Powell 2012 Index Acceleration Questions... Copy out the each question, sketch a velocity-time graph and answer in full with your working; 1.A car is travelling at a constant speed of 10m/s for a time of 5s. It then decelerates to a halt in a time of 5 seconds. What is the deceleration? 2.A car is travelling at a constant speed of 5m/s for a time of 2s. It then decelerates to a halt in a time of 2 seconds. What is the deceleration? 3.A fighter jet is on a runway and then takes off. Air traffic control record Its velocity as 250 m/s and the time from take off as 10 seconds. What is the acceleration of the plane? 4.A basket ball has an acceleration of 10ms -2 when dropped from a window. The time of flight is 5 seconds. What is the velocity of the ball just before it hits the ground (ignore air resistance)? v = final velocity u = initial velocity a = acceleration t = time 1.2ms ms ms ms ms ms ms ms -1

33 Mr Powell 2012 Index 1.3 Velocity –Time II

34 Mr Powell 2012 Index Maths Skills.... WidthHeightArea  Look at these shapes to the right, can you work out their areas?

35 Mr Powell 2012 Index Maths Skills.... WidthHeightArea  Look at these shapes to the right, can you work out their areas?

36 Mr Powell 2012 Index Distance Travelled....  So if you apply the Maths properly you can find out how far an object travels by working out the area underneath a graph.  Can you do it for this one....?

37 Mr Powell 2012 Index  Cyclist accelerated from 0m/s to 8m/s in a time of 40s  8ms -1 /40m = 0.2ms -2  (8ms -1 x 40s) /2 = 160m  40ms -1 /20s = 2ms -2  (40ms -1 x20s)/2 = 400m  (400ms -1 x10s) = 400m Velocity Time II

38 Mr Powell 2012 Index Acceleration....

39 Consolidate – How can you explain these things... a) The acceleration of an object is determined by the resultant force acting on the object and the mass of the object: F = ma b) The gradient of a distance–time graph represents speed. c) Calculation of the speed of an object from the gradient of a distance–time graph. (HT) d) The velocity of an object is its speed in a given direction. e) The acceleration of an object is given by the equation: a = (v – u)/t f) The gradient of a velocity–time graph represents acceleration. g) Calculation of the acceleration of an object from the gradient of a velocity–time graph. (HT) h) Calculation of the distance travelled by an object from a velocity–time graph. (HT) a) The acceleration of an object is determined by the resultant force acting on the object and the mass of the object: F = ma b) The gradient of a distance–time graph represents speed. c) Calculation of the speed of an object from the gradient of a distance–time graph. (HT) d) The velocity of an object is its speed in a given direction. e) The acceleration of an object is given by the equation: a = (v – u)/t f) The gradient of a velocity–time graph represents acceleration. g) Calculation of the acceleration of an object from the gradient of a velocity–time graph. (HT) h) Calculation of the distance travelled by an object from a velocity–time graph. (HT) P2.1.2 Forces and Motion


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