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star wars forces
Transcript of star wars forces
- 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
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)
Forces are unequal
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
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.
Calculate the resultant force
Which direction does the box move?
Well done everyone on your last assessment
The Empire Strikes back
• 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
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.
How long would it take a woman to walk 10 km if her average speed is 5.4 km/h ?
Rearranging the Equation
in for Tuesday
Return of the Jedi
•Give some examples of factors that
•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
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?
Explain your prediction using scientific ideas
Where you correct?
Predict which of these items will float
1. Empty can of coke
2. Tennis ball
7. Full can of coke
Attack of the Clones
- 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.
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
Use a Newton meter
Describe what causes weight
Describe differences between mass and weight
of an object is a measure of how much “stuff” it contains”.
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?
• 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
Hennessey Venom GT
The Venturi VBB-3
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.