Question

Answer the following questions

1. One Newton is equivalent to the following units:
a) kg
b) kg x m / s
c) kg x m / s ^ 2
d) (kg x m / s) ^ 2

2.In addition to the Newton as a unit of force, there are the dynes. One Newton equals to: a) 1,000 dynes b) 50,000 dynes c) 50 dynes d) 100,000 dynes

3. What are the units of the coefficient of friction? a) N, b) N ^ 2 c) 1 / N d) The coefficient of friction has no units.

4.Which of the following is the tendency of an objec t to maintain its state of rest or movement with constant speed? a) acceleration, b) inertia, c) force, d) speed

Answer 1

1) As you know the force

F=ma

here m - mass , a- acceleration So

[F]=[m][a]

N=kg.m/s2 answer is (c).

2) We know that 1.0 N =10^5 dynes Answer is (d).

3) As you know the fraction force   

here f in N, and mg in N so

unit less

Answer is d)The coefficient of friction has no units.

4) the inertia of the object is the tendency of an object to maintain its state of rest or movement with constant speed.