Work, Energy, and Power
Work
Work is a scalar quantity and is equal to the product of the magnitude of the displacement and the
component of the force in the direction of the displacement.
W ork force coponent displacement
W Fx S
Fx , is the component of

Physical quantities and units
Physical quantities are characterized by their numerical value (magnitude) and associated units. The
numerical value and the unit of a physical quantity must be separated by space (for example: 21 Kg not 21kg).
SI (System Int

Nuclear physics and the nucleus
Some properties of nuclei
Most of the atomic mass is concentrated in the atomic nucleus consisting of Z - protons and (A - Z)
neutrons.
All nuclei composed of two types of particles: protons and neutrons (protons and neutro

Work, Energy, and Power
Work
Work is a scalar quantity and is equal to the product of the magnitude of the displacement and the
component of the force in the direction of the displacement.
W ork force coponent displacement
W Fx S
Fx , is the component of

Fundamentals of waves
In general, a disturbance that propagates from one place to another is referred to as a wave. Waves
propagate with well-defined speeds determined by the properties of the material through which they travel.
The mechanical waves requ

Chapter (Work, Energy, Power)
Problem 1: A sledder, starting from rest, slides down a 10 m high hill. At the bottom of the hill is a
long horizontal patch of rough snow. The hill is nearly frictionless, but the coefficient of friction between the
sled and

Linear momentum
The linear momentum p of a body is defined as the product of its mass and velocity. p m v
Momentum is a vector quantity and it has the same direction as the velocity. In SI system momentum is
expressed in kg m / s.
Newtons second law may b

Linear momentum
The linear momentum p of a body is defined as the product of its mass and velocity. p m v
Momentum is a vector quantity and it has the same direction as the velocity. In SI system momentum is
expressed in kg m / s.
Newtons second law may b