Chapter 6 Flashcards

1
Q

If an object is stationary, what is the value of the resultant force?

A

0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What 5 factors will any measurement have?

A
  • Quantity
  • Magnitude
  • Unit
  • Error
  • Scalar or vector
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

When can a measurement be a scalar?

A

When it just has a magnitude/amount

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When can a measurement be a vector?

A

When it has a magnitude and a direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How do you model a vector?

A

Using straight arrows with a direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When modelling a vector, why is the size and length of the arrow important

A

Because it indicates the magnitude as you must declare a scale

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do you get a resultant force from parallel vectors?

A

Add them numerically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How do you get a resultant force from anti-parallel vectors

A

Add them numerically

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How do you get a resultant force from perpendicular vectors?

A

Pythag or trig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define the principle of moments

A

The moment of a force about any point is defined as the force X the perpendicular distance from the line of action of the force to the point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define the principle of moments

A

For a system in equilibrium, the sum of clockwise moments = the sum of anti clockwise moments about any given point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define centre of mass

A

The centre of mass on a body is the point at which a single force on the body has no turning effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What must be satisfied in order to have a couple?

A

Must have 2 forces equal in size and in opposite direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A body is at rest and a force is used to disturb the body. What happens if the body returns to its original position?

A

It is stable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A body is at rest and a force is used to disturb the body. What happens if the body doesn’t return to its original position?

A

It isn’t stable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What must be true about the weight and the pivot if the system is to be in equilibrium

A

The weight is in line vertically with the pivot point

17
Q

What happens if the COM is above the pivot point in relation to stability?

A

The object is unstable

18
Q

What happens if the COM is below the pivot point in relation to stability?

A

The object is stable

19
Q

Define toppling

A

The system is tilted up to a balance point, then pushed a bit further and topples over

20
Q

What can you say if a system is in equilibrium?

A

The resultant force is 0, and the principle of moments applies (clock and anti clock are equal)

21
Q

What does a free body force diagram show?

A

Shows all the forces acting on a body

22
Q

When do you use a triangle of forces diagram?

A

When funding the value of the forces or the resultant force