Which of the following is an not an effect of force:

a. to move a body from rest
b. to stop a moving body
c. to change the color of an object
d. to change the shape of an object

Which of these is evidence that an unbalanced force is acting on an object?

a. The mass of the object is changing
b. The object continues moving in a straight line
c. The object remains at rest
d. The motion of the object is changing

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