True or False in Physics?

Question

Hi, I have one try left for my homework and I need help with my reasoning. Can anybody help?

A) Mass is a measure of the inertia of a body. False
B) In order not to slow down, a car moving at a constant velocity needs a small net force applied. True? This would only be false in an ideal, fricitionless setting right?
C) An object's velocity will change if a net force acts on the object.True
D) If a net force acts on an object, the object's speed must change. ?
E) The net force which acts on an object which remains at rest is zero.
True because F=ma and if a=0 then F=0?
F) If two objects have the same acceleration, they must be under the influence of equal forces. False, they could have difference masses, therefore different Forces

Answer 1

I think except (A) and (D), other are fine.

A: True - It is a numerical measure of the inertia of an object or the amount of matter that an object contains.

D: Speed may not change but velocity (i.e. speed+direction) will change. For example, a force can only change the direction but not the speed as it happens in case of circular motion.

Answer 2

a) inertia is directly proportional to mass but mass is not a measure of inertia. false
b)true if the net force is in the same direction to the velocity, if not its is false.
c)true, newton's first law of motion.
d) not the speed must change but the velocity must change. (newton's first law) velocity is not speed since velocity also consider direction. if the object not change its direction then the speed(ie the magnitude of velocity) must change.
e)true
f) it is false

Answer 3

All correct ..