Power of Force

Power of a force acting on a block varies with time t as shown in figure. Then, angle between force acting on the block and its velocity is

Asseration : Power of a constant force is also constant. Reason : Net constant force will always produce a constant acceleration.

A : Power of the gravitational force on the body in a projectile motion is zero, once during its motion. R : Power delivered by the tension in the wire to a body in vertical circle is always zero.

Power of the only force acting on a particle of mass m=1 kg moving in straight line depends on its velocity as P=v^(2) where v is in m/s and P is in watt. If initial velocity of the particle is 1m/s, then the displacement of the particle in ln2 second will be :

Assertion: Power of a magetic force on a charged particle is always zero. Reason: Power of electric force on charged particle cannnot be zero.

In a projectile motion, power of the gravitational force

In a projectile motion, power of the gravitational force

In a projectile motion, if we plot a graph between power of the force acting on the projectile and time, then it would be like

A particle is projected with a velocity u making an angle theta with the horizontal. The instantaneous power of the gravitational force

A bode mass m is projected at an angle theta with the horizontal with an initial velocity u, the average power of gravitational force over the whole time of flight is.