Question

What is the mass of an object whose weight is 49 Newton ?

Answer 1

Hint:When a net force is applied, mass is both a characteristic of a physical body and a measure of its resistance to acceleration. The intensity of an object's gravitational pull to other bodies is also determined by its mass. The kilogramme is the SI's basic unit of mass (kg). Even though mass is frequently established by measuring the object's weight on a spring scale rather than comparing it directly to known masses on a balancing scale, mass is not the same as weight in physics.

Formula used:
$$W_g=mg$$
where $m$ is mass and $g$ is local acceleration of free fall.

Complete step by step answer:
The weight of an item is defined as the force exerted on it by gravity in science and engineering. Weight is measured in newtons, which are units of force in the International System of Units (SI). On the surface of the Earth, an item weighing one kg weighs roughly 9.8 newtons, but on the Moon, it weighs about one-sixth as much.

Despite the fact that weight and mass are technically different numbers, they are frequently confused in daily usage (i.e. comparing and converting force weight in pounds to mass in kg and vice versa).The force imposed on a body by gravity is the most frequent definition of weight.

This is commonly represented in the formula W=mg, where 'W' is the weight, 'm' is the object's mass, and g is the gravitational acceleration, which is $$9.81m{s}^{-2}$$on the earth's surface.Given $W=49N$
Since, $$W_g=mg$$
$m={\displaystyle \frac{W_g}{g}}$
$\Rightarrow m={\displaystyle \frac{49}{9.8}}$
$\therefore m=5kg$

Hence, the mass of an object whose weight is 49 Newton is 5 kg.

Note:Note that mass and weight are two different quantities. A more scientific definition of mass is that it is a measure of inertia, which is an object's tendency to not alter its present state of motion (to remain at constant velocity) unless pushed on by an imbalanced external force. When a mass is operated upon by a gravitational field and the item is not allowed to free-fall, but is supported or delayed by a mechanical force, such as the surface of a planet, gravitational "weight" is generated. Weight is the result of such a force. Any other sort of force can be applied to this force.