Force

Q. ABC is an equilateral triangle with o as its centre F1 F2 F3 represent the three forces along the sides AB , BC, AC .if if total torque about centre is 0 the the magnitude of F3

Q. A disc is rotating with angular velocity w, a force f acts at a point whose position vector with respect to the axis of rotation is vector r. The power associated with torque due to the force is given by (1) (r X f).w (2) (r X f)Xw (3) rX( f.w) (4) r. (f X w)

Q. A flywheel of moment of inertia 2 kg-m2 is rotated at a speed of 30 rad/s. A tangential force at the rim stopsthe wheel in 15 second. Average torque of the force is(1) 4 Nm(3) 8 Nm(2) 2 Nm(4) 1 Nm

Q. the force exerted on anobject is F=f_0 (x/a -1) find the work done in moving the object from x=0 to x=3a

Q. How much deep inside the earth should a man go so that his weight becomes one - fourth of that at a point which is at a height R above the surface of earth ? R=radius of earth

Q. 1. A force of 10.5 N acts on a partical along a direction making an angle of 37 degree with the vertical.find the component of the force in the vertical direction.

Q. a force 10(-k) acts on origin of coordinate system . find the torque about the point (1m, -1m, 0

Q. 22.The torque acting on the wheel about the centre is F1 is equal to 3N

Q. a man of mass 50kg carries a bag of weight 40N on his shoulder .The force with which the floor pushes up his feet will be 1)882N 2)530N 3)90N 4)600N

Q.

The dimensional formula for the torque is

1. [M¹L¹T^-2]

2. [M¹L²T^-2]

3. [M¹L²T^-1]

4. [M¹L¹T^-1]

Q.

For a conservative force, F is equal to

1. 

2. 

3. 

4. 

Q.

The figure below shows overhead views of four situations in which two forces act on the same block of mass m=1 kg and accelerate the block across a frictionless floor. Rank the situations according to the magnitudes of the acceleration of the block,

1. 1, 3, 4, 2

2. 1, 2, 4, 3

3. 1, 2, 3, 4

4. 1, 4, 3, 2

Q. what is the formula for vector addition for force

Q. If work done by internal conservative force on a body is positive then comment on the change in kinetic and potential energy of the syste

Q. A uniform rope of mass M and length L is fixed atits upper end vertically from-a rigid support. Thenthe tension in the rope at the distance / from therigid support is

Q. An electron is moving in the north direction. It experiences a force the vertically downward direction. The magnetic field at that region is towards____

Q. 41.a spring having a force constant k is divided into three equal parts. what would be force constant for each individual parts?

Q. A man carries a buccket of water in one hand and a live fish in another hand.If he drops the fish in the beccket, will he carry less weight ? Why ?

Q. A high speed car and an innocent insect have a head on collision.The force of impact splatters the poor insect over the windshield.Is the corresponding force that the insect exerts against the windshield greater , less, or same? Is the retardation of the car greater than, less than, or the same as that of the insect?

Q.

A bus can accelerate on a horizontal road due the force exerted by

1. the driver of bus

2. road

3. the engine of the bus

4. the earth

Q. while walking on ice , why one should have to take small steps to avoid sleeping

Q. if a car is moving forward, and apendulum is suspended in it, and car accelerates, why pendulum goes backeard, the force is in forward direction.

Q. a thin rod ofmass mand length 2L is made to rotate about a normal axis through center of rod .if itd angular velacity changes from 0 to ω in time t the torque acti ng on it is ?

Q. An engine can pull 4 coaches at a maximum speed of 20m/s. mass of enngine is twice that of every coach. assume resistive forces to be proportional to the weight. calculate maximum speeds of engines when it pulls 12 and 6 coaches respectively.

Q. the force required to just move a body up the inclined plane is double the force required to just prevent the body from sloding

Q. What is the rotational analogue of force? Give its SI unit.

Q. A constant force F is applied on block m kept on a smooth surface (horizontal). Find the speed of the block and energy stored in the spring at equilibrium. Also find the speed of the block at anyelongation x.

Q. If force acting on a body is constant then its kE is proportional to 1) t 2) 1/t 3) t^2 4) T^0

Q. When a load of 10 kg is suspended on a metallic wire, its its l increases by 2 mm. The force constant of the wire is 3×10⁴ N/m 2.5×10³ N/m 5×10⁴ N/m 7.5×10³N/m

Q. If a pushing force making an angle a withhorizontal is applied on a block of mass m placedon horizontal table and anale of friction is B, thenminimum magnitude of force required to move the2.block is