Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces...
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Transcript of Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces...
![Page 1: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/1.jpg)
Physics 4
Force and Motion
![Page 2: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/2.jpg)
C/W Forces Apr 19, 2023
Aims:- 4 know what forces do
5 explain where forces are balanced
6 apply rules to new situations
• Starter – 2 minutes• In the back of your book, list 5 different
kinds of forces
![Page 3: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/3.jpg)
Copy notes – 3 minutes
• A force is a push or pull on an object• Forces make things
– change speed,– change direction, or– change shape.
• Forces in opposite directions can cancel each other out
![Page 4: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/4.jpg)
Copy diagrams – 5 mins
Pumpkin on a box
Box pushes up on pumpkin
Gravity pulls down on pumpkin
The forces are balanced. The pumpkin doesn’t change speed, shape or direction
Picture Force Diagram
![Page 5: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/5.jpg)
Copy diagrams – 5 mins
Pumpkin in mid-air Gravity pulls down on pumpkin
The forces are not balanced. The pumpkin changes speed – it gets faster, downwards.
Picture Force Diagram
![Page 6: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/6.jpg)
Copy diagrams – 5 mins
Racing car doing 100mph
Engine pushesforward on car
The forces are balanced. The car doesn’t change speed – it stays at 100mph.
Picture
Force Diagram Friction pulls
back on car
![Page 7: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/7.jpg)
Copy diagrams – 5 mins
Racing car doing 100mph
Engine pushesforward on car
The forces are not balanced. The car changes speed – it gets faster.
Picture
Force Diagram Friction pulls
back on car
![Page 8: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/8.jpg)
Your turn – 20 minutes
1. Apple sitting on a table
2. Racing car doing 100mph but with the brakes on
3. Rocket taking off
4. Bungee jumper falling down
5. Bungee jumper being pulled back up
![Page 9: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/9.jpg)
Homework
• Draw a racing car design.
• Label the features that increase the forward force so it can go faster
• Label the features that decrease the backward force (friction and air resistance) so it can go faster
![Page 10: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/10.jpg)
Are You On Target Today?
Aims:-
4 know what forces do
5 explain where forces are balanced
6 apply rules to new situations
![Page 11: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/11.jpg)
C/W Speed Apr 19, 2023
Aims:- 4 know units and formula for speed
5 calculate speed
6 apply rules to changing speeds
• Starter – 2 minutes• In the back of your book, what is missing
here “John’s car goes at 100”
![Page 12: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/12.jpg)
Copy notes – 5 minutes
• Speed is how far you go in a given time• It can be measured in m/s, mph, cm/s etc.• To work out speed remember:-
Steve Digs Turnips
Speed = Distance ÷ Time (m/s) (m) (s)
![Page 13: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/13.jpg)
Calculations – 20 minutes
1. A car goes 50 miles in one hour2. A bus goes 100 miles in 4 hours3. A skateboard goes 2 metres in 1s4. A better skateboard goes 2.5m in 1s5. A skier goes 6m in 2s
A van goes 8km in quarter of an hourA sausage falls 12.76 feet in a week
![Page 14: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/14.jpg)
Practical – 30 minutes
• Listen to instructions• Easy option
– Time the whole length– Repeat for different heights– Record results in a table
• Harder option– Time half way and full length– Record the first half speed and the
second half speed
![Page 15: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/15.jpg)
Plenary – Conclusion
• Easy option– How does the speed depend on the
height of the ramp?
• Harder option– How do the first and second half
speeds compare?– What makes the car speed up?– Draw a force diagram for the car part
way down the ramp
![Page 16: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/16.jpg)
Homework
• No homework this week
![Page 17: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/17.jpg)
Are You On Target Today?
Aims:-
4 know units & formula for speed
5 calculate speed
6 apply rules to changing speeds
![Page 18: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/18.jpg)
C/W FrictionApr 19, 2023
Aims:- 4 give examples of friction
5 explain its good and bad effects
6 use the particle model
• Starter – 2 minutes• In the back of your book, write down three
examples of where friction happens (and are they useful or a nuisance?)
![Page 19: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/19.jpg)
Copy notes – 5 minutes
• Friction is a force between two surfaces• It works to stop things moving• Friction makes energy change into heat• Useful – bike brakes
– The brakes rub on the wheels– The bike’s kinetic energy is changed into heat in
the brake blocks
• Nuisance – inside a machine– The moving parts rub together– Some of the electrical energy working the
machine is turned into heat and wasted
![Page 20: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/20.jpg)
Copy note/diagram – 5 mins
• Air resistance is a kind of friction
• Air particles collide with the moving object and push against it
Air particles (magnified) Air particles hit shuttle nose, pushagainst it and warm it up
![Page 21: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/21.jpg)
Practical – 30 minutes
• Listen to instructions
• Easy option– Time the whole fall– Repeat for different sizes of paper– Record results in a table
• Harder option– As above, plus calculate the speed– Then repeat using double the weight
![Page 22: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/22.jpg)
Plenary – Conclusion
• Easy option– How does the time depend on the size of the
paper parachute?
• Harder option– Is there a relationship between the speed and
the parachute size?– Use the particle idea to explain why doubling
the weight doesn’t make much difference– Draw a force diagram for the paratrooper part
way through the fall
![Page 23: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/23.jpg)
Homework
• There was a good film a few years ago called Terminal Velocity
• Find out what “terminal velocity” means in physics
• EASY – explain it in a couple of sentences
• HARD – explain it using the idea of forces changing and being balanced
![Page 24: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/24.jpg)
Are You On Target Today?
Aims:-
4 give examples of friction
5 explain its good and bad effects
6 use the particle model
![Page 25: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/25.jpg)
C/W Speed GraphsApr 19, 2023
Aims:-
4 describe a journey shown in a graph
5 explain how the graph shows the speed
6 link the graph to the formula for speed
![Page 26: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/26.jpg)
Starter – 5 minutes
• In the back of your book, describe your journey to school – include bits where you stop, go fast, and go slow
![Page 27: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/27.jpg)
Video
“Distance-time set-up”
![Page 28: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/28.jpg)
Copy exampleDistance / m
Time / mins
500
1000
00 10 15 20 25
Walks to school
Stops in shop – whoops,forgot dinner money
Walks fastback home
Oh no, late –runs to school
![Page 29: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/29.jpg)
Questions
1. How does the graph look when you are stopped?
2. How can you tell from the graph if you’re going fast or slow?
3. What does a downward sloping line mean?
4. How can you work out speed from the graph?
![Page 30: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/30.jpg)
Plenary – Your journey
• Sketch-out the graph of your journey to school
• Sketch means:
draw axes, use a ruler, make the graph the right shape but you don’t need numbers on the axes
![Page 31: Physics 4 Force and Motion. C/WForces13-Oct-15 Aims:-4 know what forces do 5 explain where forces are balanced 6 apply rules to new situations Starter.](https://reader033.fdocuments.in/reader033/viewer/2022050714/56649eb45503460f94bbbe4e/html5/thumbnails/31.jpg)
Are You On Target Today?
Aims:-
4 describe a journey shown in a graph
5 explain how the graph shows the speed
6 link the graph to the formula for speed