Potential energy (U) related to coordinates is given by U = 3(x + y). Work was done when the particle is going from (0, 0), (2, 3) is:

 1.  15 J

2.  -15 J

3.  12 J

4.  10 J

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A mass of 0.5kg moving with a speed of 1.5 m/s on a horizontal smooth surface collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be

                       

1.  0.5 m

2.  0.15 m

3.  0.12 m

4.  1.5 m

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A mass m slips along the wall of a semispherical surface of radius R. The velocity at the bottom of the surface is [ MP PMT 1993]

(1) Rg

(2) 2Rg

(3) 2πRg

(4) πRg

Concept Questions :-

Gravitational Potential energy
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Three different objects of masses m1, m2 and m3 are allowed to fall from rest and from the same point ‘O’ along three different frictionless paths. The speeds of the three objects, on reaching the ground, will be in the ratio of 

(1) m1:m2:m3

(2) m1:2m2:3m3

(3) 1 : 1 : 1

(4) 1m1:1m2:1m3 

Concept Questions :-

Gravitational Potential energy
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When a body moves with a constant speed along a circle 

(1) No work is done on it

(2) No acceleration is produced in the body

(3) No force acts on the body

(4) Its velocity remains constant

Concept Questions :-

Work done by variable force
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A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done by centripetal force in full horizontal circle is 

(1) 0

(2) mv2l.2πl

(3) mg . 2πl

(4) mv2l.(l)

Concept Questions :-

Work done by variable force
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A ball is suspended by a thread of length l. What minimum horizontal velocity has to be imparted to the ball for it to reach the height of the suspension:

(1) gl

(2) 2 gl

(3) gl

(4) 2gl

Concept Questions :-

Work-Energy theorem
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A body of mass m hangs at one end of a string of length l, the other end of which is fixed. It is given a horizontal velocity so that the string would just reach where it makes an angle of 60° with the vertical. The tension in the string at mean position is 

(1) 2 mg

(2) mg

(3) 3 mg

(4) 3mg

Concept Questions :-

Uniform circular motion
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As per given figure to complete the circular loop what should be the radius if initial height is 5?

(1) 4 m

(2) 3 m

(3) 2.5 m

(4) 2 m

Concept Questions :-

Work-Energy theorem
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The kinetic energy k of a particle moving along a circle of radius R depends on the distance covered s as k = as2 where a is a constant. The force acting on the particle is 

(1) 2as2R

(2) 2as1+s2R21/2

(3) 2 as

(4) 2aR2s

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