Biomechanics of Sport and Exercise: kinesiology Flashcards


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created 2 weeks ago by meganglanton
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1

The center of gravity is an imaginary point around which the weight of the body is evenly distributed in all directions (t/f)

true

2

Movement of limb segments does not influence the location of the center of gravity (t/f)

false

3

When a force is applied through the center of gravity of an object, ________ motion is the result

linear

4

It is possible for the center of gravity to be located outside the body. (t/f)

true

5

In order for an object to be stable, the center of gravity must be maintained within the area of the base of support. (t/f)

true

6

A powerlifter is performing a one-repetition maximum squat. During the concentric portion of the lift, the squatter shifts their weight forward over their toes, causing them to become unstable. What is one way that the lifter could compensate for this shift to try and finish the lift successfully?

Allow their hips to shift backward, moving more of their body mass behind their feet

7

If an object's center of gravity moves outside of their base of support, the object becomes unstable (t/f)

true

8

When a gymnast does a back bend and puts their hands on the ground behind them, what is their base of support?

the area between the outside edges of their feet and hands

9

Calculate the torque applied by a 50 kg object resting at a perpendicular distance of 0.25 m from its axis of rotation.

12.5 Nm

10

Calculate the torque applied by a 20 kg dumbbell that you are holding in your hand, 37 cm from your elbow. (Hint: you will need to convert both values to calculate torque)

76.6 Nm

11

You are holding a 35 kg dumbbell steady at a 90 degree angle of elbow flexion. The moment arm of the dumbbell is 25 cm. If the moment arm of the biceps brachii is 2 cm in this instant, what is the force being produced by the bicep to hold the dumbbell steady

4291.9 N

12

You are attempting to balance five pennies on a ruler that is balancing on top of a triangular block. Each penny has a mass of 0.15 kg. If three pennies are stacked at a point 20 cm to the left of the triangular block, where should the other two pennies be stacked to balance the ruler?

...