o AT&T; LTE 4:20 PM session.masteringphysics.com C Understanding Mass... Masteri

Question

o AT&T; LTE 4:20 PM session.masteringphysics.com C Understanding Mass... MasteringPhysics Understanding Mass and Weight Learning Goal: To understand the distinction between mass and weight and to be able to calculate the weight of an object from its mass and Newton's law of gravitation. The concepts of mass and weight are often confused. In fact, in everyday conversations, the word "weight" often replaces "mass," as in "My weight is seventy-five kilograms" or "I need to lose some weight." Of course, mass and weight are related; however, they are also very different. Mass, as you recall, is a measure of an object's inertia (ability to resist acceleration). Newton's 2nd law demonstrates the relationship among an object's mass, its acceleration, and the net force acting on it: Fnet ma. Mass is an intrinsic property of an object and is independent of the object's location. Weight, in contrast, is defined as the force due to gravity acting on the object. That force depends on the strength of the gravitational field of the planet: W = mg, where W isthe weight of an object, m is the mass of that object, and g is the local acceleration due to gravity (in other words, the

Explanation / Answer

Hi

Well, according to the explanation given we should know the difference between mass and force. Also we should remember that the units for mass are: g, kg or even lb among many others; while N, kN or lb are the units of force, which means weight.

So:

0.34 g and 120 kg are definitely a measure of mass, thus they represent mass.

411 cm and 0.34 m are neither force nor mass representation. They represent distances

1600 kN is a measure of force, thus it represents force (weight)

12.0 lb is a tricky one; its units can be used to represent both, mass and weight, so they should specify if it is lbm (which would represent mass) or lbf (which would represent force).

To sum up:

0.34 g and 120 kg are the only ones that without doubts are representations of mass.

I hope it helps

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.