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star wars forces

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by

Edel Bean

on 25 April 2014

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Transcript of star wars forces


Learning Outcomes
- Identify different forces
- Describe the effects of balanced
and unbalanced forces
- Calculate the resultant force


A New Hope

What is a forces?
Working in pairs
Forces
How many forces can you think of?
What forces are acting on you now?
Balanced and unbalanced forces
Equal forces acting on one object in opposite directions

Acceleration is zero
Speed is constant
(NO CHANGE IN MOTION)
Balance Forces
40N
40N
Balanced
Unbalanced Force
100N
40N
Forces are unequal
Unbalanced
All forces have direction
Forces change the speed and direction of movement
Force is measured in Newtons
Force is nearly almost push or a pull
Resultant Force
If two forces are unbalanced there is a resultant force.
It could replace all the others to give the same effect.
The difference between two forces is the resultant force.
The resultant force is 100N – 20N = 80N
Hint: work out the difference between the two forces.
100N
20N
Calculate the resultant force
10N
7N
5N
50N
200N
80N
105N
1N
Which direction does the box move?
1
2
4
3
Well done everyone on your last assessment

Fantastic work

The Empire Strikes back
Learning Outcomes
• State what the speed equation is
•Use equation to work out the speed
•Be able to rearrange equation
•Describe factors that effect speed

2. WHO WOULD NEED TO KNOW THIS?
1. HOW DO YOU THINK WE CAN MEASURE SPEED?
Calculating Average Speed
average
speed
total distance
total time
Question 1

A group set off from home and walk at an average speed of 3.6 km/h. How far would they travel in two hours?
Give your answer in km.

Question 2

How long would it take a woman to walk 10 km if her average speed is 5.4 km/h ?
D
D
S
S
T
T
Rearranging the Equation
Homework
Worksheet -
Speed Equation
in for Tuesday
Return of the Jedi
Learning Objective

•Give some examples of factors that
affect friction
•Suggest ways of reducing friction
•Explain extra features such as spoilers

What is Friction?
Give examples when we use friction in application
How can we reduce friction?
Rub your hands together for a minute. How does that feel?
There is resistance to the rubbing motion.
The name of this resistant force is FRICTION
Friction can;
Produce heat
Wear things away
Slow things down
Make a noise
Friction is a ___________________ caused by two __________________ moving over each other. ___________________ surfaces produce more friction than __________________ surfaces.
Friction always tries to slow moving objects down. It opposes motion.
1. force 2. rough
3. smooth 4. surfaces
The Phantom Menace
Why do objects float?
Which item will float and which will sink?
Predict
Explain your prediction using scientific ideas
Where you correct?
Predict which of these items will float
1. Empty can of coke
2. Tennis ball
3. Book
4. Pencil
5. Brick
6. Boat
7. Full can of coke
8. You
Learning Objectives
Attack of the Clones
Learning Objective
- You must be able to explain the direction an object will move if the forces are unbalanced
- You should be able to measure how much force is acting on an object
- You could link how the amount of force to how much a spring stretches.
How much force pulls a spring down??
In compression the particles making up the material are pushed closer together
When it is under tension the particles making the material are pulled further apart
When a force is exerted on a spring it will either compress (push the spring together) or stretch the spring if the weight is hung on it.
Compression
Tension
Investigate how far a spring can stretch
What equipment do you need?
Make a prediction
What did you find out?
How could you improve
Revenge of the Sith
Learning Objective
Use a Newton meter
Describe what causes weight
Describe differences between mass and weight
Newton meter
The
MASS
of an object is a measure of how much “stuff” it contains”.

The
WEIGHT
of an object is the amount of force that pulls it downwards due to gravity.
This object has a MASS of 1Kg…
…and a WEIGHT of 10N
Record results in the table



Draw graph when finished
Where will the object move to?
Why do you think this happened?
Could you make a better bridge?
Learning Outcomes
• Identify the direction forces act in
• Use arrows on diagrams to represent direction of forces
• Make a series of observations about forces

Lockheed SR-71 Blackbird
The Peregrine Falcon
The Insano
The Cheeta
Usain Bolt
Hennessey Venom GT
The Venturi VBB-3
2193.2 mph
200 mph
65mph
70mph
27.79mph
265.7 mph
400 mph
Order from slowest to fastest
On your white boards
How can we work out the speed of The Big One?
Explain to theme park manager how they could work out the speed of The Big One
Describe factors that would show problems with calculating speed from just numbers.
Full transcript