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WorksheetsExamination: Statics of Rigid Bodies
Total questions: 44
Worksheet time: 1hrs 9mins
When a particle is in equilibrium, the sum of forces acting on it equals ------- . (Choose the most appropriate answer)
A constant
A positive number
Zero
A negative number
"A point at which entire weight of object concentrated toward the earth".
Identify the concept explained in the statement above.
Free body diagram
Concurrent forces
Centre of gravity
Rigid body
A particle is in equilibrium state when it is at _________ if originally at rest or has a constant __________ if originally in motion.
motion, acceleration
kinetic, veocity
rest, velocity
acceleration, kinetic
Below are the condition of equilibrium for particles except:
Total force x -axis = 0
Total force y - axis = 0
Resultant force = 0
Velocity = 0
Condition for equilibrium are:
- Resultant force = 0
- Moving with constant velocity
- Stationary/ rest
True
False
For a frictionless pulley and cable, tensions in the cable (T1 and T2) are related as
T1 > T2
T1 = T2
T1 < T2
What are the TWO equilibrium cases for forces acting on an object?
When the object is moving at a constant velocity
The object is speeding up
The object is at rest
The object is slowing down
What force is always present when an object is close to the earth's mass?
Applied Force
Normal Force
Frictional Force
Gravitational force
What forces are on a hot air balloon hovering in the air but being blown by the wind?
gravitational force, normal force and applied force
gravitational force, buoyant force and the force from the wind
gravitational force, normal force, applied force and frictional force
gravitational force, buoyant force and optimistic force
In physics, this may be described as the pulling force transmitted by the means of a string, cable, chain, or similar one-dimensional continuous object
Tension
Buoyancy
Friction
Normal Force
An object resting on a surface experiences +980 N of Normal force. What is the mass of the object?
W=mg
-98 kg
9.8 kg
100 kg
-100 kg
A uniform bar 15 m in length, weighing 500 N is supported at its smooth spots against some smooth vertical walls as shown below. If the tension in the vertical cable is 'T', calculate the reactions at A and B.
HA = 500 N; HB = 111.11 N
HA = 88.8 N; HB = 131.11 N
HA = HB = 500 N
HA = HB = 111.11 N
In case of the free body diagram of a body, the false statement(s) is,
FBD is useful in analysing the equilibrium of a constrained body.
FBD is helpful in finding reactions at the supports.
Only active forces are shown in FBD.
None of the these.
A rigid prismatic weightless bar AB is supported in a vertical plane by a hinge at the end A and by a horizontal string attached to the Bar at D as shown in fig.
The tension in the string is,
w tanθ
2 w tan
4 w tanθ
None of these
A rigid prismatic weightless bar AB is supported in a vertical plane by a hinge at the end A and by a horizontal string attached to the Bar at D as shown in fig.
The tension in the string is, the inclination of the reaction from horizontal is given by,
An uniform wheel of 60 cm diameter, weighing 1000 N, rests against a regular obstacle 15 cm height. The least value for θ to overcome the obstacle is,
45°
90°
60°
30°
A cylinder of weight 'w' and radius 'r' is to be supported in a horizontal position against a vertical wall by a bar AB of negligible weight and length 'l' .The bar is hinged to the wall at A and supported at B by a horizontal rope BC. The angle θ af the bar with the vertical, so that the tension in rope is minimum, should be,
30°
45°
90°
60°
A cylinder of weight 'w' and radius 'r' is to be supported in a horizontal position against a vertical wall by a bar AB of negligible weight and length 'l' .The bar is hinged to the wall at A and supported at B by a horizontal rope BC. The angle θ af the bar with the vertical,
An automobile of weight 'w' is shown in figure A pull 'P' is applied as shown. The reaction of front wheel (location A) is,
A man weighing 75 N stands on the middle of a 25 N ladder lying on a smooth flow against a wall. The ladder is prevented from slipping by a spring OD. The tension in the spring will be,
40.56
56.40
4.056
405.6
A man weighing 75 N stands on the middle of a 25 N ladder lying on a smooth flow against a wall. The ladder is prevented from slipping by a spring OD. The reactions at A & B in are respectively,
120.26 & 35.13 N
121.26 & 34.13 N
129.26 & 19.13 N
110.26 & 40.23 N
An electric light fixture weighing 150N hangs from a point A by hinges AB and AC. The tension is string AB would be approximately
77 N
86 N
99 N
98 N
A string 2 m long is tied to the ends of a uniform rod that weight 60 N and is 1.6 m long. The string passes over a nail so that the rod hangs vertically. The tension in the string will be.
24 N
30 N
42 N
50 N
A circular roller of weight W hangs by a tie rod and rests against a smooth vertical wall. The tension in the rod AB will be
less than weight W
greater then W
equal to W
none of these
A mass of 1 kg. Is attached to the middle of a rope, which is being pulled from both ends in the opposite directions. Taking g = 10 m/s2, the minimum pull required to completely straighten the rope will be
5 N
20 N
25 N
much larger than 25 N
Three weights are hung from a level surface and a force parallel with the surface is applied as shown in the figure below. What is the magnitude of the resultant force? (Civil Services)
3
6
A body of mass 10 kg. Moving with a velocity of 1 m/s is acted upon by a force of 50 N for two seconds. The final velocity is
22 m/s
1 m/s
11 m/s
Two blocks with masses M and are in contact with each other and are resting an a horizontal frictionless floor. When horizontal force is applied to the heavier, the blocks accelerate to the right. The force between the two blocks is (Gate -86)
(M + m) F/m
MF/m
mF/M
mF(M + m)
A 6.0 kg box sledge is travelling across the ice at a speed of 9.0 m/s when a 12 kg package is dropped into it vertically. As a result it
stops moving
continues to move at the same speed
continues to move at half the initial speed
continues to move at one-third the initial speed.
The displacement of a particle undergoing rectilinear motion along the X-axis is given by
x = 2t3 - 21 t2+ 60t + 6 meters
The acceleration of the particle, when its velocity is zero, will be
+ 36 m/s2
- 18 m/s2
+ 9 m/s2
- 9 m/s2
