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BMSc > Biomech Unit 1 part 1 > Flashcards

Biomech Unit 1 part 1 Flashcards

1
Q

Name the four base SI units

A

metres, seconds, kilogram, kelvin

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2
Q

Name the supplementary SI units

A

radian

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3
Q

Give example of a derived unit

A

Newton - kgms-2

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4
Q

What is the prefix for mega

A

x10^6

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5
Q

Prefix for micro

A

x10^-6

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6
Q

Prefix for nano

A

x10^-9

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7
Q

SI unit for angle and common unit

A

radian - SI

common - degrees

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8
Q

SI unit for temp and common unit

A

Kelvin - SI

Common - degrees celsius/fahrenheit

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9
Q

What is a reference frame?

A

A plane in which an objects motion and position is related to

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10
Q

Naem the two co-ordinate systems

A

Rectangular coordinate system and polar co-ordinate system

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11
Q

Describe the rectangular one

A

aka cartesian co-ord system - x,y,z axis (think of cube)

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12
Q

What is a plane

A

a flat surface with zero thickness therefore 2D

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13
Q

What is formed where two planes cross each other?

A

a straight line

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14
Q

What is a polar co ordinate

A

used in circular objects where angles and rotations are important

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15
Q

What co ordianted system is used for joints motion?

A

polar

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16
Q

What is a vector quantity

A

Magnitude and direction

17
Q

Velocity vs speed

A

Velocity - rate of change of dispalcement therefore vector

18
Q

Average velocity

A

V = change in dispalcement / time

19
Q

Acceleration

A

Rate of change of velocity

20
Q

Two effects of force

A

change the position of object and deform the shape

21
Q

Which effect is ignored for rigid body mechanics

A

No deforming of shape

22
Q

How do we measure force

A

calibrated spring balance

23
Q

What does statics involve

A

forces and moments acting on objects at rest or moving with constant velocity

24
Q

A static object has no acceleration but has a resultant force.

A

FALSE has neither

25
Q

What is the first condition of static equilibrium and what is its fancy name

A

external forces acting o an object equal zero (in all the axes of a frame) –> translational equilibrium

26
Q

Newtons 3rd law

A

every action ahs an equal but opposite reaction

27
Q

What is a free body diagram

A

allows you to visualise and solve complex maths problems - all external froces acting on body are hsown

28
Q

define mass

A

quanitity of matter which body is amde of

29
Q

define weight

A

force of graity acting on a body

30
Q

difference between weight on moon and earth

A

moons gravitational frield is 1/6 of that on earth therefore weight less

31
Q

equation of density

A

density (p) = mass/volume

32
Q

Density is constant for a certain material

A

TRUE

33
Q

Define gravity

A

acceleration due to the gravitational attraction between two bodies

34
Q

Centre of mass what is it

A

COM is the point where all the mass of object can be assumed to act - depends on how mass is distributed

35
Q

The COM must lie within the body itself

A

FALSE

BMSc (8 decks)

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