Biomechanics exam 2

If a body of constant mass is traveling with a constant velocity,

there must be no net force acting on the body.

The product of a body’s mass and its velocity defines

Momentum

Which of Newton’s laws is described by the equation F = ma

Second

According to Newton’s third law, when two bodies collide,

the force applied to each body will be the same size.

During an arm wrestling match, your opponent is winning. He is slowly pushing your arm down toward the table. If you are doing any mechanical work against your opponent, the work is

Negative

In the kinetic energy equation, which component is most important?

Velocity (because it is squarred)

What is the correct order for a 2nd class lever?

Force, Resistance, Axis

Stability may be increased by

(answer = increasing the weight)

A. Lowering the center of mass increases stability.

B. Increasing the base of support increases stability.

C. Increasing the weight and keeping it lower can increase stability.

A diver attempts a 1 1/2 front flip in a tuck position off the 1 m board, but only rotates 1 ¼ times (ouch!).

Which of the following suggestions is NOT appropriate for the diver?

A. Jump higher

B. Tuck looser

C. Tuck sooner

D. Release tuck later

E. Generate more angular momentum going into the dive

You are coaching a Little League baseball team. One of your players is having a hard time hitting the ball. He does a good job of choosing which pitches to swing at, but he keeps missing because his bat doesn't get around fast enough. What would you suggest that he do?

Choke up on the bat.