Which of the following statement is NOT true about machines?
a
Machines decrease the amount of work that is done.
b
Machines change the size of a force needed to do the work.
c
Machines change the direction of a force needed to do the work.
d
Machines change the way work is done.
a) Machines decrease the amount of work that is done. (This statement is not true as machines do not decrease the amount of work that is done, they just make the work easier to do by changing the force, direction, or way it is done.)
The correct answer is:
a) Machines decrease the amount of work that is done.
This statement is not true about machines. Machines do not decrease the amount of work that is done; instead, they can make it easier to do work by changing the size, direction, or way work is done.