Science simple machines

Question 1

If a simple machine allows you to lift an object using less force than you normally would need to lift the object without the machine, chances are that it will require you to move ________________ distance.

Answer 1

Greater

Question 2

Consider the toys that you played with at the end of the lab. Typically, after you did something to toy, but before you let it go, the toy was motionless. At this point, it had

Answer 2

Elastic potential energy

Question 3

The steeper you made the inclined plane the _____________ the two works (workin and workout) got.

Answer 3

closer together

Question 4

The 2 work numbers for the lever tended to be closer to each other than for the inclined plane. Why?

Answer 4

The lever had less friction

Question 5

Consider the toys that you played with at the end of the lab. Typically, after you did something to toy, then let it go. At this point (after you let it go) it will move and at this point it had

Answer 5

Kinetic Energy

Question 6

A stationary object (such as the ramp that you pulled the weight up) can do work.

Answer 6

1) True

Question 7

The steeper you made the inclined plane the _____________ the two forces (forcein and forceout)got.

Answer 7

closer together

Question 8

If there was no friction on the inclined plane:

Answer 8

More than one of these answers is correct

The 2 works calculated would have been the same

Question 9

As you move your hand farther and farther out from the fulcrum on a lever, what should happen to the amount of force YOU need to apply to lift a specific amount of weight on the other end of the lever?

Answer 9

It should decrease

Question 10

A simple machine that needs 10N to lift an 8N object, and needs 10J put in to get 8J out can not make your work easier.

Answer 10

False

Question 11

Simple machines change:

Answer 11

The distance/speed of the force
The size of the force
The direction of the force

Question 12

Johnny holds 50lb dumbbells out to his sides (1.5m off the ground) for 15 minutes.
Melvin does 15 bicep curls with 5 lbs, (moving the weight up a distance of about 1 meter).
Who has done more work in the time described above?

Answer 12

Melvin

Question 13

A steeper inclined plane was better than a shallow one because it had less _______, but required more ______.

Answer 13

friction, force

Question 14

Theories often come after laws, explaining offering an explanation for why the law works.

Answer 14

True

Question 15

As you make an inclined plane longer and shallower (assuming you are lifting the same object the same vertical height) what should happen to the amount of work done by friction?

Answer 15

It increases

Question 16

A shallow inclined plane was better than a steep one because it required less _______, but, on the other hand, it was bad because it required more ______.

Answer 16

Force, energy

Question 17

If a pulley allows you to lift a 10N object with only about 5N of force, the distance your hand should have to move (ignoring friction) compared to the distance the object will move should be

Answer 17

about 2x

Question 18

As you add more and more ropes to a pulley system, what SHOULD happen to friction?

Answer 18

It should increase

Question 19

laws may change with new discoveries.

Answer 19

True

Question 20

Theories may become laws with further testin

Answer 20

False

Question 21

A simple machine decreases the amount of WORK needed to get the job done (work you get out is more than the work you put in).

Answer 21

False

Question 22

Consider the toys that you played with at the end of the lab. Where did the energy for those toys originate?

Answer 22

Work