Answer to Question #83752 in Mechanics | Relativity for Kaia

Question

An object has an ass of 20000 grams how much does it weigh? How much work is done in pushing this object a horizontal distance of 5 meters?

Answer 1

According to definition of weight

F=mg

where m is mass; g is local acceleration of free fall. Hence

F=20kg∙9.8 m/s^2 =196N

From definition of the work

W=F∙d∙cos⁡α

where F is applied force; d is displacement; α is angle between force and displacement.

If you measure the work force of gravity with horizontal displacement α=〖90〗^0 and W=0J.

There are not enough data to consider the work of other forces.