His weight on earth where the gravitational strength is 1.7N/kg
Answers
Answer:
The kgwt is not a unit which you should be using rather use the newton (N) as the unit of force.
9.8 crops up in a number of situations.
The force of gravitational attraction on a mass of 1 kg on the Earth is 9.8 N.
Another way of putting that is that the gravitational field strength on the surface of the Earth is 9.8 N/kg.
The acceleration due to gravity (no other forces acting other than gravity) on the surface of the Earth is 9.8 m/s22 which means that all bodies accelerate downwards at the same rate irrespective of their mass - remember no air resistance etc.
One of the problems is that the symbols usually used for gravitational field strength gg is the same as the symbol for the acceleration due to gravity gg.
Strictly speaking the force of gravitational attraction on a mass mm in a gravitational field of gg N/kg is mgmg although the gg in that equation is often called the acceleration due to gravity.
So weight (N) = mass (kg) ×× gravitational field strength (N/kg) although the equation will often be written weight (N) = mass (kg) \times acceleration due to gravity (m/s22).
You will perhaps gather from this that 1 N/kg = 1 m/s22 as force = mass ×× acceleration so forcemass=accelerationforcemass=acceleration which can cause further confusion because you could say that the gravitation field strength on the Earth is 9.8 m/s22 and be using the correct units.
Explanation: