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**Chapter 3 • Kinesiology** 97

*(The top section contains illustrations of two figures with free-body diagrams demonstrating Center of Gravity cog, Weight (W), Normal force (N), and Base of support.)*

*Reference: Hollis and Cook. Practical Exercise Therapy, 4th edition. Blackwell Science; 1999. p. 26,27.*

**11. Which Newton's law is also referred to as the law of inertia?**

a. First law

b. Second law

c. Third law

d. Law of acceleration

**Explanation**

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

**Newton's first law of motion**

* An object at rest stays at rest

* An object acted upon by a balanced force stays at rest

* An object acted upon by an unbalanced force changes speed and direction

*Reference: Hollis and Cook. Practical Exercise Therapy, 4th edition. Blackwell Science; 1999. p. 12.*

**12. Mechanical advantage is never obtained in lever of _______________ _.**

a. First order

b. Second order

c. Both first and second order

d. Third order

*(In the right margin, the answers to the questions are provided:)*

**Ans.**

11. a

12. d

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