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Levers - PowerPoint PPT Presentation
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Investigation 1:. Levers. Set the challenge…. Can you lift a heavy load with only one finger? Does it always take the same amount of force to lift a load?. Do you know that you can perform stunning feats of brute strength, far more amazing than the most powerful athletes?.
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PowerPoint Slideshow about 'Levers' - signe-chaney
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Presentation Transcript
Set the challenge…
- Can you lift a heavy load with only one finger?
- Does it always take the same amount of force to lift a load?
Do you know that you can perform stunning feats of brute strength, far more amazing than the most powerful athletes?
- It’s true, you can roll big boulders around like basketballs, lift half a dozen sixth graders off the floor with one hand, pull nails right out of wood, and flip the cap off a bottle of root beer with no difficulty at all.
What’s the secret?
LEVERAGE
- These tasks can be accomplished by using the aid of a lever!
- A lever is a simple machines that provides you with an advantage
- It can make work easier…
1. make a load easier to lift
2. reduce effort
3. Increase speed or distance
How does it work?
- The lever arm is the straight, rigid bar
- The pivot point is the fulcrum
- A load is on one side on the lever
- Effort is applied to the other side to life the load
- Effort applied to one side of the lever lifts the load on the other side.
Can you find my FELLA?
- Draw & Label my parts on the note card provided
~Vocabulary~Please record the following in your packet.
- Lever = a simple, rigid device that contains a fulcrum
1. Fulcrum = the pivot point or fixed point that the lever arm can rotate around
2. Effort =the force applied to move the load
3. Load = a mass lifted by the lever
4. Lever arm = the rigid bar or beam
How much force is needed to push or pull a load?
- It is measured in newtons
- Newtons = The newton, usually abbreviated as N, is the Standard International unit of force.
- Force is measured in newtons
Take a moment to learn about using spring scales!
Apply what you have learned…
- A mass of 1 kg pulls or pushes down (because of gravity) with a force of 10 N
- If a 5 kg cat is asleep on one end of a lever arm, you will have to push down on the other end of the lever arm with an effort equal to the force of _________ or the cat won’t budge.
To keep in mind while measuring…
- When you attach the scale to the lever with the rubber band, the mass of the scale itself, being pulled by gravity, exerts a force.
- However, you will see that the effort is 0 N
- In fact, the weight of the scale is pulling down with a force of 0.5 N
- Add on .5 N to the scale reading whenever you are pulling down with the scale!
