CBSE > Class 11 > Physics | CBSE Board | Homework Help

The force of opposing which comes into play when a body tends to slide over the surface of anothe body, that opposing force is called static friction.

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What is Validity?

Posted by Harish Rautela 8 years, 3 months ago

CBSE > Class 11 > Physics

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What is line of action

Posted by Ayush Gupta 8 years, 3 months ago

CBSE > Class 11 > Physics

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What is velocity ?

Posted by Maneet Singh 8 years, 3 months ago

CBSE > Class 11 > Physics

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Joshua Fernandes 8 years, 3 months ago

Change in displacement per unit time

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Can a body have zero velocity and still be acceleration

Posted by Rishabh Jaiswal 8 years, 3 months ago

CBSE > Class 11 > Physics

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Aditi Goel 8 years, 3 months ago

Yes, when a body is thrown upwards then at the highest point its velocity is zero though it has the acceleration due to gravity in the downward direction

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Can a body have constant velocity and still have varrying speed.

Posted by Rishabh Jaiswal 8 years, 3 months ago

CBSE > Class 11 > Physics

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Aditi Goel 8 years, 3 months ago

No, because speed is equal to the magnitude of velocity.

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What is rolling friction

Posted by Keshav Singh 8 years, 3 months ago

CBSE > Class 11 > Physics

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Amar Kumar 8 years, 3 months ago

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface.The main source of friction in rolling appears to be dissipation of energy involved in deformation of the objects.

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what is collision

Posted by Ankit Dahiya 8 years, 3 months ago

CBSE > Class 11 > Physics

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Amar Kumar 8 years, 3 months ago

Collision is short-duration interaction between two bodies or more than two bodies simultaneously causing change in motion of bodies involved due to internal forces acted between them during this. Collisions involve forces (there is a change in velocity). The magnitude of the velocity difference just before impact is called the closing speed. All collisions conserve momentum.

Collisions can be elastic or inelastic.

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A ball suspended by a thread swings in a vertical plane so that its acceleration values in the extreme and the lowest position are equal. Find the thread deflection angle in the extreme position

Posted by Ritesh Kumar 8 years, 3 months ago

CBSE > Class 11 > Physics

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NCERTBOOK OF CLASS 11

Posted by Poona Pandv 8 years, 3 months ago

CBSE > Class 11 > Physics

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Work done means force multiplied by displacement these two are vector quantities but work done is scalar.. why.?

Posted by Anshika Dixit 8 years, 3 months ago

CBSE > Class 11 > Physics

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Ritesh Kumar 8 years, 3 months ago

It's defined as a dot-product (or scalar product) of force and displacement, both of which are vectors. A scalar product of two vectors gives a scalar result (aptly named!). dW=F⃗ ⋅S⃗ =∥F∥∥S∥cosθ dW=F→⋅S→=‖F‖‖S‖cos⁡θ (θθ being the angle between the vectors). No direction, only magnitude. Thinking logically, what would be the direction of work, anyway? You may say, "In the direction of displacement!", but then why not in the direction of force? And if you say the direction of both, well then, it isn't always the same! A force can do work on a body even displacing at an angle to the direction of force (θθ!). =>Note that when θθ is 90∘90∘, the result will be zero (cos90∘=0cos⁡90∘=0). When force and displacement are perpendicular, the force does no work on the body! Please also note that work is part of the energy in a system (work and energy) and energy is a scalar. If it were not so we would not be talking of "conservation of energy" as an experimental observation. Energy is a scalar.

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What is relation between range and maximum height

Posted by Aakash Tiwari 8 years, 3 months ago

CBSE > Class 11 > Physics

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Swarnali Mondal 8 years, 3 months ago

H=R tan theta /4

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What is potential energy of a spring?

Posted by Yash Sharma 8 years, 3 months ago

CBSE > Class 11 > Physics

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Amar Kumar 8 years, 3 months ago

Elastic potential energy is Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched.

The spring constant, k , is a measure of the stiffness of a spring (large k stiff spring, small k soft spring).

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The velocity with which projectile hits the ground.What is the formula.

Posted by Pradhumn Sharma 8 years, 3 months ago

CBSE > Class 11 > Physics

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define circular motion

Posted by Nishant Sharma 8 years, 3 months ago

CBSE > Class 11 > Physics

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Amar Kumar 8 years, 3 months ago

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform, with constant angular rate of rotation and constant speed, or non-uniform with a changing rate of rotation.

Examples of circular motion include: an artificial satellite orbiting the Earth at a constant height, a stone which is tied to a rope and is being swung in circles, a car turning through a curve in a race track, an electron moving perpendicular to a uniform magnetic field, and a gear turning inside a mechanism.

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Why are hammer with long handle preferred

Posted by Adarsh Jha 8 years, 3 months ago

CBSE > Class 11 > Physics

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Why pulling the lawn roller is preferred than pushing the lawn roller

Posted by Nikhil Nag 8 years, 3 months ago

CBSE > Class 11 > Physics

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Rishabh Jaiswal 8 years, 3 months ago

The force applied on the body to move depends upon effective force applied on it including its wight . As defective weight in the case of pulling is less than in the pushing.

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What is cross product

Posted by Arnav Singh 8 years, 3 months ago

CBSE > Class 11 > Physics