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What is the physical quantity which has the units Nm?
A joule has units of N-m. It is a unit of energy or work.
What is a potential difference and what SI unit is used to measure it?
it is a quantity defined as work done per unit charge.it has same unit as voltage which is volt represented by 'V'.
Is work done a scalar or a vector quantity?
Work done is the amount of energy transferred by a force acting through a distance. It is a scalar quantity.
What is a quantity that measures the rate at which work is done or energy is transformed?
You seem to be referring to power. One unit for that is the watt, another is the horsepower.
What is a unit of work and what does it mean?
Joule is a unit of work and energy equals the work to be done
How is time measurable by physical devices if it is not a physical quantity?
Well, some physical devices don't work at all.
Weight x distance divided by time?
Weight has same dimension and unit as force. Distance has same dimension and unit as displacement. So weight * distance has same dimension and unit as force * displacement. Force * displacement is work done by the force. Work divided by time to do the work is Power. So weight * distance divided by time also has same dimension and unit as Power although it is not power. S.I. unit of weight * distance divided by time is Newton *meter/second or Nms-1 (in abbr.) It's dimensions are 1, 2, -3 in mass, length and time respectively. Note that given quantity's unit can't be joule/second or watt because weight * distance is not work done, only unit and dimension are same1 . 1. Two physical quantities may have same dimensions and units but that doesn't mean they refer to same quantity.
What is the amount of work done per unit time?
Work done per unit time is called power because power is work done divided by time in sec. So per unit time is seconds.
What is the Relation of power with work and time?
Power = (quantity of work done) divided by (time to do it)
What is The rate at which work is done or the amount of work done in a unit of time is called?
" power "
How much force is done with the work being 10 and distance being 3?
Work is force times displacement (distance). Thus, about 3 work is being done. The unit depends on the unit of the work and distance. If the work unit is Joules, and the distance unit is meters, then the force unit would be Newtons.
Differentiate batween the work done on the body and work done by the body?
note: Work done is = force applied to a body * time taken by the body When we apply a force on to an object such that the object displaced in the direction of force, then some unit of work is done on the body. When a body sets another body into motion by applying a force, in unit time, that body is considered as it had done a unit of work
