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Class 11 Question Answers

What is Static Friction, Limiting Friction and Kinetic Friction?

· The opposing force that comes into play when one body tends to move over the surface of another, but the actual relative motion has yet not started is called Static friction.· Limiting friction is the max...

Class 11 Subject: Physics Topic: Friction ,Inertia

What is friction ?

Friction is an opposing force that comes into play when one body actually moves (slides or rolls) or even tries to move over the surface of another body. Thus, the force of friction is the force that develops a...

Class 11 Subject: Physics Topic: Friction ,Inertia

Explain why: a. a horse cannot pull a cart and run in empty space b. passengers are thrown forward from their seats when a speeding bus stops suddenly,

a. a horse cannot pull a cart and run in empty space, Ans: In order to pull a cart, a horse pushes the ground backward with some force. The ground in turn exerts an equal and opposite reaction force upo...

Class 11 Subject: Physics Topic: Force

Applications of Newton’s Laws of Motion

There are two kinds of problems in classical mechanics :(a) To find unknown forces acting on a body, given the body’s acceleration. (b) To predict the future motion of a body, given the body’s initial position and vel...

Class 11 Subject: Physics Topic: Motion

Two billiard balls each of mass 0.05kg moving in opposite directions with speed 6ms^-1 collide and rebound with the same speed. What is the impulse imparted to...

It is given that,Mass of each ball =0.05 kg Initial velocity of each ball = 6 m/sMagnitude of the initial momentum of each ball, pi=0.3kgms^-1After collision, the balls change their directions of motion without changing...

Class 11 Subject: Physics Topic: Speed,Acceleration and Distance

A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 ms^-2. Calculate the initial thrust (force) of the blast.

It is known that, Mass of the rocket,m= 20,000 kgInitial acceleration,a=5ms^-2Acceleration due to gravity,g =10ms^-2By using Newton’s second law of motion, The net force (thrust) acting on the rocket can be written as:F-...

Class 11 Subject: Physics Topic: Speed,Acceleration and Distance

The mass of a box measured by a grocer’s balance is 2.30 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of...

The mass of the box = 2.30 kgand the mass of the first gold piece = 20.15 gThe mass of the second gold piece = 20.17 gThe total mass = 2.300 + 0.2015 + 0.2017 = 2.7032 kgSince 1 is the least number of decimal places,...

Class 11 Subject: Physics Topic: measurements

The photograph of a house occupies an area of 1.75 cm2 on a 35 mm slide. The slide is projected onto a screen, and the area of the house on the screen is 1.55 m...

Arial Magnification = Area of the image/Area of the object= 1.55/1.75 x 104= 8.857x 103Linear Magnification = √Arial magnification= √8.857x 103 = 94. 1

Class 11 Subject: Physics Topic: Magnification

Answer the following : (a) You are given a thread and a metre scale. How will you estimate the diameter of the thread? (b) A screw gauge has a pitch of 1.0 mm...

(a) The thread should be wrapped around a pencil a number of times to form a coil having its turns touching each other closely. Measure the length of this coil with a metre scale. If L be the length of the coil and n...

Class 11 Subject: Physics Topic: measurements

A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average...

Magnification of the microscope = 100 The average width of the hair in the field of view of the microscope = 3.5 mm Actual thickness of hair =3.5 mm/100 = 0.035 mm