# ONLINE PHYSICS SOLUTION

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# Friction Part 2

Friction related concepts: 1. A car of mass m is moving with speed u and brake is applied so that it travels distance s before

# Friction Part 1

Friction: Friction is the retarding force which acts tangentially to the contact surface when a body actually moves or tends to move over the surface

# Dot and Cross Product of Vector

Scalar product or dot product: The scalar product of two vectors and is defined as the product of the magnitudes of and and the cosine

# Vector Subtraction, Resolution and 3D Representation

Subtraction of vectors: Let us consider and creates angle θ. To subtract from we can write + (- ) [where – is the opposite vector

# Vector: Basic definition and addition

Scalar: The quantities which are specified by magnitude and no directions and follow the ordinary algebra are called scalar quantity. Example: mass, volume, speed, density

# Numerical Problems on Mirror

An object is kept in front of a concave mirror of focal length 20 cm. The image formed is 3 times the size of object.

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Negative marking concept increases the skill of students on focusing competitive examinations.

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