When you lift your books from the desk you apply?

When you lift your books from the desk you apply?

Answer. Answer: Answer. When you lift the book, you are doing positive work, because the force you exert on it is in the same direction as its displacement.

What makes a book move from your book bag to your desk?

The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. For example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion.

When a book is lifted from a table which force work is done?

Question. 12 When a book is lifted from a table, against which force work is done ? Answer. Work is done against the force of gravity.

Does the work done depends upon how fast an object is raised explain?

No, the work done does not depend on how fast an object is raised up. For the constant value of m and g, the work depends on height upto which it is raised. Power is the physical quantity which is defined as the rate of doing work i.e. and, t=time taken.

Does the work done in raising a block on to a platform depends on the how fast it is raised up if not why?

Work done does not depend upon how fast an object is raised up. It is clear that work done depends on force, distance and angle between force and displacement. We can say that the work done in raising a box on to a platform does not depends upon how fast it is raised up.

Can PE of a body be negative?

Yes, it can be negative, when forces involved are attractive.

Does the work done in raising a box onto a platform depend on how fast is it raised?

Yes, the power needed to raise a box onto a platform depends on how fast it is raised.

When work is done on a body by an external force is?

An external force can change the kinetic energy or potential energy of an object without doing work on the object- that is, without transferring energy to the object. Instead,the force is responsible for transfers of energy from one type to another inside the object. Answer verified by Toppr. 1935 Views. Upvote (15)

What is work in terms of physics?

Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.

What is power 11th class?

We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s).

What is conservative force Class 11?

Conservative forces are those for which work done depends only on initial and final points. Example- Gravitational force, Electrostatic force. Non-Conservative forces are those where the work done or the kinetic energy did depend on other factors such as the velocity or the particular path taken by the object.

What is the work energy theorem prove it?

The work-energy theorem states that the work done by the net force acting on a body is equal to the change produced in the kinetic energy of the body. Let F be the variable force. According to Newton’s law, F=ma.

How do you solve Work energy theorem?

Key Takeaways

1. The work W done by the net force on a particle equals the change in the particle’s kinetic energy KE: W=ΔKE=12mv2f−12mv2i W = Δ KE = 1 2 mv f 2 − 1 2 mv i 2 .
2. The work-energy theorem can be derived from Newton’s second law.
3. Work transfers energy from one place to another or one form to another.

What is the formula for work done by friction?

Friction does negative work. Example 10: In Example 9, the work done by force of friction is -112,000J. Use the work formula to calculate the force applied by friction if brakes were used within a distance of 56m. Solution: Using Work formula: W = Fk x ; -112,000J = Fk(56m); Fk =-2000N.