Chapter 12

Question 1

Statics

Answer 1

The branch of mechanics that studies an object or body’s state of constant, unchanged motion.

Question 2

Dynamics

Answer 2

A branch of mechanics that studies the changes in the motion of objects or bodies as a result of the actions of forces.

Question 3

-Stability-

Answer 3

The three point stance has the effect of lowering the football player’s centre of mass, which provides more stability.

Question 4

-Production of maximum force-

Answer 4

A young T-ball player will often stand very upright, with feet planted, and swing the bat using only the arms to make contact with the ball.

Question 5

-Production of maximum velocity-

Answer 5

A proficient golfer relies on a precisely sequenced swing, integrating leg, hip, and arm action to produce a slower, more controlled swing of the club.

Question 6

-The impulse momentum-

Answer 6

By applying a large impulse, a hitter can strike the ball so that it leaves the bat with more velocity.

Question 7

-Direction of force application-

Answer 7

A soccer player will push his or her foot against the ground to make a change in direction away from the opponent.

Question 8

-Production of angular motion-

Answer 8

Throwing a curve in baseball.

Question 9

-Conservation of angular momentum-

Answer 9

Divers in a state of free fall