Advertisements
Advertisements
Question
The work done by all the forces (external and internal) on a system equals the change in ______.
Options
total energy
kinetic energy
potential energy
none of these
Advertisements
Solution
The work done by all the forces (external and internal) on a system equals the change in kinetic energy.
Explanation:
As we know that the work done by the external force changes into the total energy but the internal force acting in the object can only vibrate the molecules or the atoms which further leads to the movement as the result of which Kinetic energy also increases.
Thus, the work done by all the forces (External or Internal) will completely lead to increases in the kinetic energy.
APPEARS IN
RELATED QUESTIONS
A boy is sitting on a chair placed on the floor of a room. Write as many action-reaction pairs of forces as you can.
List all the forces acting on (a) the pulley A, (b) the boy and (c) the block C in figure.
The sum of all electromagnetic forces between different particles of a system of charged particles is zero
Which of the following systems may be adequately described by classical physics ?
(a) motion of a cricket ball
(b) motion of a dust particle
(c) a hydrogen atom
(d) a neutron changing to a proton.
At what distance should two charges, each equal to 1 C, be placed so that the force between them equals your weight ?
Two spherical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.
A small block of mass m is kept on a rough inclined surface of inclination θ fixed in an elevator. the elevator goes up with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be
A block of mass m slides down a smooth vertical circular track. During the motion, the block is in
A particle moves from a point \[\overrightarrow{r}_1 = \left( 2 m \right) \overrightarrow{ i } + \left( 3 m \right) \overrightarrow{ j } \] to another point
\[\overrightarrow{r}_2 = \left( 3 m \right) \overrightarrow{ i } + \left( 2 m \right) \overrightarrow{ j } \] acts on it. Find the work done by the force on the particle during the displacement.
A block of mass m is kept over another block of mass M and the system rests on a horizontal surface (In the following figure). A constant horizontal force F acting on the lower block produces an acceleration \[\frac{F}{2 \left( m + M \right)}\] in the system, and the two blocks always move together. (a) Find the coefficient of kinetic friction between the bigger block and the horizontal surface. (b) Find the frictional force acting on the smaller block. (c) Find the work done by the force of friction on the smaller block by the bigger block during a displacement d of the system.
A block of weight 100 N is slowly moved up a smooth incline of inclination 37° by a person. Calculate the work done by the person in moving the block through a distance of 2 m, if the driving force is (a) parallel to the incline and (b) in the horizontal direction.
A uniform chain of mass m and length l overhangs a table with its two third part on the table. Find the work to be done by a person to put the hanging part back on the table.
The work done by an applied variable force, F = x + x3 from x = 0 m to x = 2m, where x is displacement, is:
A lawn roller is pulled along a horizontal surface through a distance of 20 m by a rope with a force of 200 N. If the rope makes an angle of 60° with the vertical while pulling, the amount of work done by the pulling force is:
A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure correctly shows the displacement-time curve for its motion?
What does 'dW' represent in the variable force work calculation?
A particle of mass 'm' and charge 'q' is placed at rest in uniform electric field E and then released. The momentum gained by the particle after moving a distance 'y' is \[\sqrt{2x}.\] Then x is equal to ______.
A particle moves under the effect of a force F = Cx from x = 0 to x = x1. The work done in the process is ______.
