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Engineering Mechanics: Kinetics of a Particle
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Engineering Mechanics: Kinetics of a Particle
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25 Questions

1. An iron ball having a mass of 100 g with a velocity of 10 m/s collides with the wall at an angle of 300 and rebounds with the same angle. If the period of contact between the wall and the ball is 0.1 second. What is the force experienced by the ball?
2. What is the S.I unit of work done?
3. If the momentum of a body is increased n times, its kinetic energy increase
4. If the K.E of a body is increased by 300% its momentum will increase by
5. Which of the following factors are related to the work-energy principle?
6. How is a jet plane able to fly in the air?
7. Internal force is responsible for the change in velocity of an object.
8. A man stands on a weighing machine in the lift. When the lift is stationary his weight is recorded as 40 kg. If the lift accelerates upwards with an acceleration of 2 m/s2 what weight will the machine show?
9. An object will possess uniform motion as long as the
10. In an elastic collision of two particles the following is conserved
11. Which of the following is momentum closely related to?
12. In an elastic collision of two billiard balls, the total kinetic energy is conserved ___________
13. A bullet of 5 gms travels with a velocity of 100 m/sec. It penetrates a wooden block up to 6 cm. What is the average force imposed on the block by the bullet?
14. The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is
15. A parachutist weighing w strikes the ground with his legs fixed and comes to rest with an upward acceleration of 3 g. What is the force exerted by him during landing?
16. Comets mover around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet’s velocity in general. Yet the work done by the gravitational force over every orbit of the comet is zero. Why?
17. A hammer is resting on a plane surface. If force P is applied on the hammer along with a line not passing through its centre of mass, them the hammer _____________
18. What will happen if the body at rest is made to move in a straight line and obstructed by an opposite force?
19. A body at rest may have
20. Rocket Engines lift rocket from the earth surface because the hot gas with high velocity
21. If the stone is thrown up vertically and return to the ground, its potential energy is maximum
22. A person standing in the elevator finds his weight to be lesser than his actual weight in which of the following cases?
23. A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement.
24. A wagon weighing 1000 kg moves 50 km/h on smooth rails. Later, a mass of 250 kg is placed in the wagon. What is the velocity with which it moves?
25. If the linear momentum is increased by 50% the kinetic energy will increase by

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