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Laws Of Motion
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A block of weight W is suspended from the mid-point of a rope whose ends are at the same horizontallevel.
The force required to straighten the rope is
W / 2
W
infinitely large
2W
A block of mass M placed on a horizontal surface is connected to a nylon rope of mass M.
A. force f 1 N is applied to the free end of the rope in the horizontaldirection.
The tension at the mid-point of the rope is
0.25 N
0.75 N
0.50 N
1 N
Two masses 3 kg and 5 kg are suspended from the ends of an unstretchable massless cord passing over a frictionlesspulley.
When the masses are released, the pressure on the pulley is
7.5 kg f
15 kg f
2 kg f
8 kg f
An astronaut of weight M g is in a rocket accelerating upward with an acceleration of 4 g. The apparent weight of the astronaut will be
5 Mg
Mg
Zero
4 mg
Husband and wife stand facing each other and pull on a light rope stretched betweenthem.
How far each has moved when they meet ?Given : Husband s weight = 60 kg wt.Wife s weight = 40 kg. wt.Initial separation = 5 m
Wife does not moves while the husband moves 5 m1
Wife moves 3 m while husband moves 2 m
Both move 2.5 m towards each other
Wife moves 2 m while husband moves 3 m
An elevator and its load have a total mass of 800 kg. The elevator is originally moving downwards at 10 m/s, it slows down to stop with constant acceleration in a distance of 25 m. Find the tension T in the supporting cable while the elevator is being brought torest.
(Take g = 10 m/square second)
6400N
8000N
9600N
1600N
Steady rain, giving 5 m m an hour, turns suddenly into a downpour giving 20 mm an hour and the speed of the rain drops falling vertically on to a flat foof simultaneouslydoubles.
The pressure exerted by the falling rain on the roof is raised by a factor of
32
8
4
16
An empty plastic box of mass 5 kg is observed to accelerate up at the rate of g / 6 when placed deep insidewater.
What mass of sand should be put inside the box so that it may accelerate down at the rate of g / 6
1 kg
2 kg
1.5 Kg
2.5 Kg
A body of mass 10 kg is to be raised by a massless string from rest to rest, through a height 9.8 m. The greatest tension which the string can safely bear is 20 kg wt. The least time of ascent is
4 s
3 s
NONE OF THESE
2 s
The ratio of the weight of a man in a stationary lift and in a lift accelerating downwards with a uniform acceleration a is 3 : 2. The acceleration of the lift is
G
2g
g / 2
g / 3
Two masses 5 kg and 3 kg are suspended from the ends of an inextensible light string passing over a frictionlesspulley.
When the masses are released, the force exerted by the string on the pulley is
7.5g
5g
15g
8g
An open knife edge of mass M is dropped from a height h on a woodenfloor.
If the blade penetrates distance S into the wood, the average resistance offered by the wood to the blade is
Mg
Mgh
Mg (1 = h / S)
Mg (1 - h / S)
A 1 kg object suspended by a thread is (i) lifted up with an acceleration of g / 2 (ii) lowered with an acceleration of g / 2. The ratio of the tensions in the two cases is
3 : 1
1 : 3
2 : 1
1 : 2
A uniform rope of mass M, length L is fixed at its upper end vertically from a rigidsupport.
Then the tension in the rope at the distance l from the rigid support is
M g
M / L (L - l)g
l / L M g
M / l L g
A boy stand on a weighing machine inside a lift
. When the lift is going down with ecceleration g/4, the machine shows a reading 30 kg. When the lift goes upwards at acceleratin g/4, the reading would be
37.5 kgf
67.5 kgf
50 kgf
18 kgf
A block has weight W and it is held against a vertical wall by applying a horizontal force F. The minimum value of F is
equal to w
greater than W
not settled by the data
less than w
n small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be
mnu
2 mnu
1 / 2 mnu
4 mnu
A stone is accelerated upwards by a cord whose breaking strength is three times the weight of thestone.
The maximum acceleration with which the stone can be moved up without breaking the cord is
4g
2g
3g
G
A man is pulling a rope attached to a block on a smooth horizontaltable.
The tension in the rope will be the same at all points
if and only if the rope is not accelerated
always
if and only if the rope is massless
if either the rope is not accelerated or is massless
Two bodies of masses 6 kg are tied to the ends of a string which passes over a fixed pulley of the Atwoodsmachine.
The total downward thrust on the pulley is nearly
8 * 9.8 N
6 * 9.8 N
7 * 9.8 N
5 * 9.8 N
1
2
4
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Related Topics
Laws Of Motion
Laws of motion
Simple Harmonic Motion and Waves
Description Of Motion In One Dimension
Motion In Two And Three Dimensions
Circular Motion Centre Of Mass
Fluids In Motion
Centre of mass and rotational motion.
Motion in one dimension
Motion in two and three dimensions
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