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Course: Alhussan Physics — Stage 8
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Alhussan Physics — Stage 8

Chapter 6: Forces, Motion and Pressure

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Chapter 7: Light

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Chapter 8: Magnetism and Electromagnets

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Chapter 9: Energy Resources

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Chapter 10: The Earth in Space (Galaxies and Asteroids)

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Quiz

Physics 6.13 Centre of mass and stability — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
An object topples when its weight acts ____ its base.
inside
outside
at the centre of
above
2.
Position of centre of mass along a broom (cm from handle end). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 1
A
B
C
D
3.
Toppling angle rose from 22° to 45°. Percentage increase?
51%
23%
205%
105%
4.
Which is the correct definition of “Wide base”?
Imagined experiment to test ideas.
Ideal surface with no friction.
Makes objects more stable.
Shortest distance from pivot to the force line.
5.
Tilt angle before toppling for vehicles (°). What is the total of all the values?
Dr Dabour Hub Academy - figure 2
43
124
111
137
6.
Tilt angle before toppling for vehicles (°). Which has the greatest value?
Dr Dabour Hub Academy - figure 3
Racing car
Family car
Double-decker bus
Van
7.
Which statement is NOT correct?
Loading top shelves improves stability.
Boats have heavy keels to keep the centre of mass low.
Double-decker buses carry heavy parts low down.
Bending your knees lowers your centre of mass.
8.
A low centre of mass makes objects ____ stable.
equally
not
more
less
9.
True or false? Double-decker buses carry heavy parts low down.
True
False
10.
Tilt angle before toppling for vehicles (°). Which has the smallest value?
Dr Dabour Hub Academy - figure 4
Double-decker bus
Family car
Van
Racing car
11.
True or false? An object topples when its weight acts outside its base.
True
False
12.
Position of centre of mass along a broom (cm from handle end). What is the total of all the values?
Dr Dabour Hub Academy - figure 5
230
284
257
92
13.
Tilt angle before toppling for vehicles (°). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 6
A
B
C
D
14.
True or false? A broom balances at its middle.
True
False
15.
Which statement is correct?
Objects topple when weight acts inside the base.
The centre of mass is always inside the object.
Loading top shelves improves stability.
A wide base makes objects more stable.
16.
Which is the correct definition of “Low centre of mass”?
Makes objects more stable.
Force pushing forward.
Beyond it the spring does not return to its original length.
Object with mass evenly spread.
17.
Moment of a 1000 N weight acting 0.2 m outside the base?
200 N m
5000 N m
2000 N m
1000 N m
18.
True or false? Traffic cones have wide bases for stability.
True
False
19.
Tilt angle before toppling for vehicles (°). What is the value for Double-decker bus?
Dr Dabour Hub Academy - figure 7
43
34
22
25
20.
Which statement is correct?
A ring's centre of mass is in empty space.
High centre of mass is more stable.
Racing cars are tall.
Bending knees raises your centre of mass.
21.
Toppling angle rose from 11° to 39°. Percentage increase?
28%
355%
255%
72%
22.
Position of centre of mass along a broom (cm from handle end). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
23.
Tilt angle before toppling for vehicles (°). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
24.
Toddlers fall easily because their heads are ____.
missing
light
small
heavy
25.
True or false? Wine glasses with wide bases are harder to knock over.
True
False
26.
True or false? A broom's centre of mass is closer to the heavier end.
True
False
27.
True or false? Buses carry heavy parts on top.
True
False
28.
A uniform plank is 3 m long. Distance of centre of mass from one end?
1.5 m
0.8 m
6.0 m
3.0 m
29.
Toppling angle with height of centre of mass. At what value of "Height of centre of mass (cm)" is "Toppling angle (°)" greatest?
Dr Dabour Hub Academy - figure 10
10
5
20
15
30.
Which term matches this definition? “Weighted string hanging vertically.”
Moment
Aristotle
Topple
Plumb line
31.
A hanging card settles with its centre of mass directly ____ the pivot.
above
beside
below
at
32.
Which statement is NOT correct?
The centre of mass is where the plumb lines cross.
Filling a lorry's top shelves makes it less stable.
Wine glasses with wide bases are harder to knock over.
Objects topple when weight acts inside the base.
33.
Tilt angle before toppling for vehicles (°). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 11
A
B
C
D
34.
Moment of a 1000 N weight acting 0.1 m outside the base?
10 N m
100 N m
1000 N m
10,000 N m
35.
Weight acts through the ____.
top
centre of mass
base
edge
36.
Racing cars are built ____ for stability.
narrow
light only
low
tall
37.
A ring's centre of mass is in ____.
empty space
the metal
the bottom
the top
38.
Position of centre of mass along a broom (cm from handle end). What is the value for B?
Dr Dabour Hub Academy - figure 12
83
85
128
96
39.
Toppling angle with height of centre of mass. By how much does "Toppling angle (°)" change between 5 and 20?
Dr Dabour Hub Academy - figure 13
39
14
31
59
40.
Which is the correct definition of “Plumb line”?
Moment of a force.
Weighted string hanging vertically.
Rope designed to stretch to catch falls.
Shape change that remains.
41.
True or false? Plumb lines hang horizontally.
True
False
42.
Bending your knees ____ your centre of mass.
doubles
lowers
raises
keeps
43.
Which term matches this definition? “Line along which weight acts.”
Line of action
Topple
Climbing rope
Aristotle
44.
Which statement is correct?
A broom balances at its middle.
Filling a lorry's top shelves makes it less stable.
Loading top shelves improves stability.
Racing cars are tall.
45.
Moment of a 100 N weight acting 0.2 m outside the base?
20 N m
200 N m
500 N m
100 N m
46.
Moment of a 500 N weight acting 0.2 m outside the base?
100 N m
500 N m
1000 N m
2500 N m
47.
Position of centre of mass along a broom (cm from handle end). About how many times bigger is C than A?
Dr Dabour Hub Academy - figure 14
2.3
1.7
0.6
1.1
48.
Which term matches this definition? “Point where the mass seems to be concentrated.”
Spanner
Limit of proportionality
Line of action
Centre of mass
49.
Plumb lines are hung from 3 points. How many lines must cross to confirm the centre of mass?
1
2
4
3
50.
Position of centre of mass along a broom (cm from handle end). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 15
A
B
C
D
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Part of Chapter 6: Forces, Motion and Pressure — see every lesson and quiz in this unit.
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