For each of the following, put "A" if it is always true, "S" if it is...

For each of the following, put "A" if it is always true, "S" if it is sometimes true, or "N" if it is never true.

(a) The net force on an object is zero if its speed remains constant.

(b) Normal force cannot do work on any system.

(c) If mechanical energy is not conserved, friction is the reason.

(d) A person riding a ferris wheel will feel heaviest at the bottom.

(e) If a moving object changes direction, a net force must act on it.

(f) The terminal velocity of a 25 kg object is higher than that of a 10 kg object.

Expert Solution

A) the net force on an object is zero if its speed remains constant - is always true statement (A) due to Newton's first law of motion (law of inertia)

B) normal force cannot do work on any system is always true statement (A) because the angle between the normal force and displacement is 90 degree and hence the work done is zero.

C) if mechanical energy is not conserved friction is the reason- it is sometimes true statement. (S)

D) A PERSON RIDING A Ferris wheel WILL FEEL HEAVIEST AT THE BOTTOM. it is always true statement (A)

E) moving object changes direction and it force must act on it as a always true statement (A) which is in accordance with and Newton's first law of motion which is also termed as law of inertia.

F) the terminal velocity of a 25kg object is higher than that of a 10 kg object is never true statement.(N)

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genius_generous answered 2 years ago

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