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BMSc - Mechanics > Unit 2 - Forces > Flashcards

Unit 2 - Forces Flashcards

1
Q

What two effects does a force have on a body?

A

change position

deform

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2
Q

What is weight?

A

the force of gravity acting on a body

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3
Q

What is mass?

A

the quantity of matter of which a body is composed

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4
Q

Does density remain constant?

A

yes

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5
Q

What happens to the volume of a body if the mass increases?

A

changes proportionately

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6
Q

What is gravity?

A

acceleration due to gravitational attraction of two bodies

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7
Q

What is a centre of mass?

A

the point in a body where its mass is assumed to act

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8
Q

What is centre of gravity?

A

the point in a body where gravity is assumed to act

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9
Q

in a body with both centre of mass and centre of gravity, where will they be in relation to eachother?

A

the same place

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10
Q

Which factors are the maximum friction force dependant on?

A

texture of the surfaces

force pushing them together

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11
Q

what is the equation for coefficient of friction?

A

(micro) = friction force/force acting normally to the surface

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12
Q

Does lubrication reduce rolling friction?

A

no - but it may reduce wear

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13
Q

What is the first condition of static equilibrium?

A

the sum of all forces acting on the body must = 0

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14
Q

What is momentum?

A

it is an expression of the bodies persistence to continue in its present state of motion

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15
Q

What is the moment of a force?

A

its tendency to produce a rotation about an axis

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16
Q

what is another name for moment?

A

torque

17
Q

what are the units of torque?

A

N m

18
Q

What does a high mechanical advantage mean?

A

that the effort force is lower than the resistance force

19
Q

Why do muscles operate at a force disadvantage?

A

speed of movement

range of movement

20
Q

How many classes of lever are there?

A

3

21
Q

Describe a 1st class lever

A

the fulcrum is located between the effort and resistance forces

22
Q

Give examples of 1st class levers

A

see-saw
scissors
crowbar

23
Q

Describe a 2nd class lever

A

the resistance is located between the fulcrum and the effort

24
Q

Give examples of a 2nd class lever

A

wheelbarrow

nutcracker

25
Q

Describe a 3rd class lever

A

The effort force is located between the resistance and the fulcrum

26
Q

Give examples of a 3rd class lever

A

tweezers

fishing rod

27
Q

What is the equation for tangential linear velocity?

A

v=rw

28
Q

What is the equation for tangential linear acceleration?

A

a - r x alpha

29
Q

What are the two equation for radial linear acceleration?

A

aR = v2/r = rw2

BMSc - Mechanics (8 decks)

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