College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Two particles of different mass start from rest. The same net force acts on both of them as they move over equal distances. How do their final kinetic energies compare? (a) The particle of larger mass has more kinetic energy, (b) The particle of smaller mass has more kinetic energy, (c) The particles have equal kinetic energies, (d) Either particle might have more kinetic energy.

To determine
Kinetic energy of the particles.

Explanation

Given Information:

1. (i) m1â‰ m2 , m is the mass of particle
1. (ii) F1â‰ F2 ,F is the Force of particle
1. (iii) d1â‰ d2 , d is the distance moved by the particle
1. (iv) Initial kinetic energies of both particle is zero

Explanation: Kinetic energy of the particles can be explained by using the concept of force, work done and work-energy theorem.

Force:A push or pull which produces or tends to produce the motion in a body is called a force.

Work done: The work done by a force is the product of the force and the distance moved in the same direction.

W=Fd

• W is the work done,
• F is the force,
• d is the distance,

Kinetic energy (K.E): The work that an object can do because of its motion.

K.Eâ€‰=â€‰12mv2

• m is the mass of the object
• v is the velocity of the object.

Work-energy theorem: The net work on an object causes a change in the kinetic energy of the object

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