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5 Matching questions

1. If machines do not reduce the amount of work being done, how do they help us?
2. ^ ---> Doing work?
3. ^ ^ Doing work?
4. Whats a wheel and axle?
5. What is the scientific meaning of the word "work"?
1. a a simple machine that is made of a circular object connected to a rod.
2. b Yes
3. c Work happens when a force causes an object to move in the same direction of that force.
4. d 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. e No

5 Multiple choice questions

1. 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.
2. No, the same amount of work is done, whether you do it yourself, or use a machine.
3. No
4. simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
5. a simple machine that has a fulcrum, or pivot point.

5 True/False questions

1. What are compound machines?a machine made of two or more simple machines. example: scissors, can openers

2. what is a wedge?simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.

3. What is an inclined plane?a simple machine with a straight, slanted surface.

4. What is the formula for power?P=W / T, the unit Watts

5. what is a machine?a double inclined plane that moves.

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