5 Written Questions
5 Matching Questions
- ^ ---> Doing work?
- What is a pulley?
- ^ ^ Doing work?
- What is a lever? list two other examples of a lever.
- if you are carrying a suitcase,are you doing work on the suitcase? why or why not?
- a Yes
- b a simple machine that has a fulcrum, or pivot point.
- c simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
- d No. you are doing work on it when you pick it up, b/c when you pick it up, the direction of the movement of the object is the same as the direction of the force you are putting on it.
- e No
5 Multiple Choice Questions
- a simple machine with a straight, slanted surface.
- you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.
- pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
- is a measure of how much of a machines energy is wasted, overcoming friction. No machine is 100% efficient, becuase there are always surfaces rubbing together.
- Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.
5 True/False Questions
What two things do we need to know to calculate work? → we need to know the size of the force that was put on the object, and how far the object moved.
What is "power", scientifically speaking? → Yes
^ <--- Doing work? → No
what is a wedge? → a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
does a machine reduce the amount of work that is being done? Explain. → Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.