Biomechanics class test 2 April Flashcards Preview

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Flashcards in Biomechanics class test 2 April Deck (29):
1

What is the formula for limiting friction?

Coefficient of limiting friction x perpendicular reaction force

2

What is the formula for sliding friction?

Coefficient of sliding friction x perpendicular reaction force

3

What is the formula for the coefficient of restitution?

-e= v/u

4

What is the formula for radians?

Length of arc/ radius of circle

5

What is the formula for angular velocity?

Change in angular displacement/ change in time

6

What is the formula for angular acceleration?

Change in angular velocity/ change in time

7

What is the formula for a torque?

Force x perpendicular distance from axis of rotation

Moment of inertia x angular acceleration

8

What is the formula for moment of inertia?

Mass x distance from axis of rotation squared

9

What is the formula for momentum?

Velocity x mass

10

What is the formula for angular momentum?

Moment of inertia x angular velocity

11

Define friction

The force that arises when one body moves/ tends to move

12

What does the coefficient of friction depend on?

Material and roughness

13

When an object is static, is the magnitude of friction equal to the force?

Yes

14

What does rolling friction depend on?

Weight, radius, deformability, coefficient

15

Define elasticity

Ability of body to return to original shape once deformed

16

What is the coefficient of restitution?

A measurement of elasticity

17

What s an oblique impact?

When bodies don't collide 'head on'

18

How can you reduce a force?

Spread over a longer period of time

19

Define projectile motion

Motion of objects under influence of ar resistance and gravity

20

Do internal forces change motion of centre of gravity?

No

21

Then the release height is the same as the landing height, what is the optimal release height?

45 degrees

22

What direction does drag act?

In direction of air flow

23

What direction does lift act?

At right angles to drag

24

When is an angle formed?

2 lines
2 planes
1 line and 1 plane

25

Is angular displacement vector or scalar?

Vector

26

Is angular distance vector or scalar?

Scalar

27

Normally, is a clockwise displacement considered positive or negative?

Negative

28

What to concentric and eccentric forces cause

Concentric- linear
Eccentric- Angular and linear

29

What are force couples?

Equal, opposite, directed and parallel forces