Which of these statements about machines is false?
a. Machines decrease the amount of work needed to do a job
b. Machines decrease the force needed to get the work done,
c. Machines increase the distance moved in doing the work
d. Because of friction, the work input is more than the output

a. Machines decrease the amount of work needed to do a job

Explanation:

Machine is a mechanical device which reduce our efforts and makes the work simpler

So We know that the machine is a device which always reduce the work required

so here correct answer will be

a. Machines decrease the amount of work needed to do a job

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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