WorksheetsTorque, CoM, CoG Study Guide
Total questions: 70
Worksheet time: 1hrs 3mins
A object will topple over when its center of gravity extends beyond its supporting base
True
False
The man waking across a wire holds his arms up in order to do what?
Feel for wind
Mentally handle being on a wire
Change his momentum
Shift his center of gravity easily
What equilibrium is being shown?
Stable Equilibrium
Unstable Equilibrium
Neutral Equilibrium
None of the Above
What equilibrium is being shown?
Stable Equilibrium
Unstable Equilibrium
Neutral Equilibrium
None of the Above
Which screwdriver can apply more torque with the same force?
The top one
The bottom one
Both are the same
I do not have enough information
Where is the center of gravity?
The Geometric Center
Close to the Edge
Depends where the laces are
Depends where the ball is sitting
A state of equilibrium is also seen below. Each of the cars weighs the same 9800 N. Despite the fact that there is only one car on the left-hand side that is 9 m from the fulcrum, the torques balance because, the cars on the right-hand side, are ____meters from the fulcrum.
4.5 m
3 m
1 m
2 m
Which one describe the point through which the whole weight of the body acts?
Inertial Point
Center of gravity
Centriod
Central point
Which simple method can be used to find the centre of gravity of an object?
stop watch
plumbline
pendulum
gauge
What stops you from standing up when not leaning forward in your chair?
Gravity being too strong
The centre of gravity is moving too much
The chair putting a force on your body
The centre of gravity isn't able to shift
Why is the car on the left unstable?
Its centre of mass is high
it has a narrow base
it has a high height
all of the above
Why is the car on the right more stable?
Its centre of mass is higher
it has a wider base
it has more height
all of the above
There must be equal amounts of mass on both sides of the center of mass (or center of gravity) of a system.
True
False
Five equal forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a counter-clockwise torque about point P? (There could be more than one correct choice.)
A
B
C
D
E
Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force has a greater magnitude?
the first force (at the midpoint)
the second force (at the doorknob)
The two forces are equal.
Five equal forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a clockwise torque about point P? (There could be more than one correct choice.)
A
B
C
D
E
Five equal forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing the least torque about point P? (There could be more than one correct choice.)
A
B
C
D
E
Where is the center of gravity of a softball bat located?
Exactly halfway along the bat
In the thin handle
In the more massive end of the bat
An object will fall over if its center of gravity is
outside the object.
too low.
not over its area of support.
too high.
When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows
a regular straight-line path.
a wobbly path with irregular speed.
a straight-line path with irregular speed.
When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?
To change the mass of your body
To be ready to grab something in case you fall
To look good
To change the center of gravity of your body and the load
To change the weight of your body and the load
If an object is in unstable equilibrium, any displacement will
raise its center of gravity.
increase its mass.
neither raise nor lower its center of gravity.
lower its center of gravity.
decrease its mass.
If an object is in stable equilibrium, any displacement will
raise its center of gravity.
neither raise nor lower its center of gravity.
decrease its mass.
increase its mass.
lower its center of gravity.
If you try to touch your toes while standing flat against a wall, you probably will fall over. The reason this happens is that
your center of gravity is not located directly above your support area.
your center of gravity is outside your support area.
both A and B
The long heavy tail of a spider monkey enables the monkey to easily vary its
center of gravity.
weight.
momentum.
inertia.
none of the above
The center of mass of a human body is located at a point
that changes as a person bends over.
that is fixed, though different for different people.
that is always directly behind the belly button.
none of the above
An object thrown into the air with a spin rotates about its
geometric center.
center of gravity.
edge.
midpoint.
none of the above
A ball resting on the floor is in what kind of equilibrium?
Neutral
Stable
Unstable
A picture hangs on a wall from a wire that is passed over a supporting nail. The picture is in stable equilibrium because
its center of gravity is directly below the supporting nail.
any slight push will raise its center of gravity.
after any small push, it will return to its original position.
all of the above
Based on stability concepts, you would expect a very broad tree to have
exceptionally strong roots.
very deep roots.
a very broad root system.
Suppose you try loosening a nut with a wrench, and the nut doesn't give at all. You increase your chance of success if you _____.
have a friend help you pull on the wrench
be sure to exert force perpendicular to the lever arm
exert a larger force
extend the lever arm
all of the above
To turn a stubborn screw, it is best to use a screwdriver that has a _____.
yellow color
wide handle
long handle
none of the above
Two people sit on a balanced seesaw. When one person leans toward the center of the seesaw, that person's end of the seesaw will _____.
fall
rise
stay at the same level
Which one is the measure of how much matter an object has?
weight
gravity
mass
volume
The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.
Which pivot positions allows the force F to be as small as possible?
A
B
C
D
Where will be the centre of mass of a uniform rod lies ?
At its end
At its middle point
At its centre of its cross sectional area
Depends upon its material
The diagrams show four solid cones. The centre of mass of each cone is marked by a point labelled M.
Which cone is the most stable
A
B
C
D
A figure skating pair is moving together at 10 m/s. One is thrown forward at 15 m/s. The speed of the center of mass after the throw is _____? (ignore friction)
greater than 10 m/s
10 m/s
less than 10 m/s
depends on the masses of the two skaters
Do all objects have a centre of gravity?
No objects have a centre of gravity
Only some objects have a centre of gravity
Only very heavy objects have a centre of gravity
Yes all objects have a centre of gravity
The point through which the whole weight of the body acts is called
Inertial Point
Center of gravity
Centriod
Central point
Can the centre of mass of a body be at a point outside the body?
Yes
No
A
B
C
D
Define Base of Support
An objects ability to maintain a stable position
The area around the contact points with the ground. The larger it is, the greater stability a person has.
Base of support contributing factors
The point at which all parts of an object are equally balanced
Define Centre of Gravity
An objects ability to maintain a stable position
The area around the contact points with the ground. The larger it is, the greater stability a person has.
Base of support contributing factors
The point at which all parts of an object are equally balanced
How does a person become more stable in relation to my COG?
The higher the COG the more stable you are
If the COG is in the centre of the BOS you are stable
The lower the COG, the more stable you are
Define Line of Gravity
An objects ability to maintain a stable position
The area around the contact points with the ground. The larger it is, the greater stability a person has.
The vertical line that passes through the centre of gravity to the ground.
The point at which all parts of an object are equally balanced
Who is the most stable sports player ?
Who is the least stable sports player ?
The illustration shows a bunsen burner in 3 different positions. Which of these positions is the most stable?
X
Y
Z
W
In this illustrations, which factors affecting the stability of an object?
Area of the base
Position of CG
Weight of an object
Condition of equilibrium
In this illustrations, which factors affecting the stability of an object?
Area of the base
Position of CG
Weight of an object
Condition of equilibrium
What is the meaning of a stable structure?
A strong structure
A structure that does not topple easily
A structure that is built from different shapes
A large and high structure
