Work, Energy and Power — practice questions
62 curated practice questions from Work, Energy and Power (Physics NEET, NTA Exams) — 33 easy, 16 hard, 13 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A body of mass m moving with a velocity u collides elastically directly with another stationary body of mass 3m. The…
- A block of mass 50 kg slides over a horizontal distance of 1 m . If the coefficient of friction between their surfaces…
- If a bullet of mass 5 g moving with velocity 100 m/sec, penetrates the wooden block up to 6 cm. Then, the average force…
- A bullet is fired at a plank with a speed of 200 m/s. After passing through the plank, its speed reduces to 180 m/s…
- A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10…
- A ball moving with velocity 2 m s -1 collides head on with another stationary ball of double the mass. If the…
- A spring of spring constant 5 10^ 3 ~N / m is stretched initially by 5 cm from the unstretched position. The work…
- A particle of mass m 1 is moving with a velocity v 1 and another particle of mass m 2 is moving with a velocity v 2 …
- A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for…
- A particle of mass 5 kg moves according to the law x=0.2 t^ 2 +0.02 t^ 3 . Find the work done by the force in first 4 s.
- High water fall is used for generating electricity. Water is falling from a 60 m height. Assuming 2 10^ 5 ~kg of water…
- Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are…
- Find the energy stored in a 90 cm length of a laser beam operating at 10 mW.
- A long spring is stretched by 2 cm. Its potential energy is U. If the spring is stretched by 10 cm, the potential…
- A body of mass M 1 collides elastically with another mass M 2 at rest. There is maximum transfer of energy when:
- How much work must be done by a force on 50 kg body in order to accelerate it from rest to 20 m/s in 10 s?
- In fog, photographs of the objects taken with infrared radiations are more clear than those obtained using visible…
- The coefficient of restitution e for a perfectly elastic collision is:
- Given below are two statements Statement I : In an elastic collision of two billiards balls, the total kinetic energy…
- The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential…
- A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much…
- A body moves from a position r _ 1 =(2 i -3 j -4 k ) m to a position r _ 2 =(3 i -4 j +5 k ) m under the influence of a…
- A body of mass m moving with velocity u collides with a stationary body of mass 2m. The speed of the system after…
- Masses of the two substances are 1 g and 9 g respectively. If their kinetic energies are same then the ratio of their…
- An athlete in the Olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the…
- The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is
- A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10…
- An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit…
- A ball of mass m = 1 kg rolling without slipping strikes a wall and rolls back. Before the impact the velocity of the…
- A particle moves from a point r _ 1 =3 i +2 j to another point r _ 2 =2 i +3 j during which a constant force F =[3 i +3…
- A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet building. After a fall of 30 feet each…
- A ship of mass 3 10^ 7 kg initially at rest, is pulled by a force of 5 10^ 4 N through a distance of 3 m. Assuming that…
- A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms -1…
- A particle moves from position 3 i +2 j -6 k to 1 i i +13 j +9 k due to a uniform force of (4 j + j +3 k ) N . If the…
- A body of mass 2 kg is let fall from the top of a 10 m tall building. It lands on a sandy patch of ground and buries…
- When a spring is stretched by 2 cm, it stores 100 J of energy. If it is stretched further by 2 cm, the stored energy…
- A particle moves along a circular path under the action of a force. The work done by the force is :
- A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is…
- A force F =( 5 i +3 i ) Newton is applied over a particle which displaces it from its origin to the point r =( 2 i -1 D…
- A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1 m/s. so that he…
- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- A particle moves from a point (-2 i +5 j ) to (4 j +3 k ) when a force of (4 i +3 j ) N is applied. How much work has…
- 300 Joule of work is done in sliding up a 2 kg block on an inclined plane to a height of 10 metres . Taking value of…
- When an unpolarized light of intensity I_ 0 is incident on a polarizing sheet, the intensity of the light which does…
- If the linear momentum of a body is increased by 50%, then the kinetic energy of that body increased by
- Two springs having spring constant of k 1 = 25 N/m and k 2 = 16 N/m are stretched by forces F 1 and F 2 to have equal…
- A mass m moving with an initial velocity u, makes a head-on elastic collision with a particle of mass 2m, the later…
- A force (where K is a positive constant) acts on a particle moving in the x - y plane. Starting from the origin, the…
- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- If kinetic energy of a body is increased by 300% then percentage change in linear momentum will be:
- The potential energy of a body is given by A-E x^ 2 (where x is the displacement). The magnitude of force acting on the…
- Two blocks A and B have different kinetic energies K_ A and K_ B [K_ B >K_ A ] . Both are released on a rough…
- When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential…
- If momentum is increased by 20%, then kinetic energy is increased by
- If the kinetic energy of a body changes by 20%, then its momentum would change by
- A bomb of mass 9 kg explodes into 2 pieces of mass 3 kg and 6 kg. The velocity of mass 3 kg is 1.6 m/s, the kinetic…
- A 2 kg mass starts from rest on an inclined smooth surface with inclination 30 o and length 2 m . How much will it…
- A man drags a block through 10 m on rough surface A force of acting at 30º to the horizontal. The work done by applied…
- If clouds are 1 km above the Earth and rain fall is sufficient to cover 1 km 2 at sea level, 1 cm deep, how much work…
- A spring of spring constant k placed horizontally on a rough surface is compressed by a block of mass m placed on the…
- Assertion : No work is done if the displacement is zero. Reason : Work is done by the force is defined to be the…
- Two identical balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one…