Question

Weight of an object on the surface of moon is 8.0 N.Mass of the object on earth surface is​

Answer 1

Answer:

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Answer 2

Answer:

Units of Force

The equation Fnet=ma is used to define net force in terms of mass, length, and time. As explained earlier, the SI unit of force is the newton. Since Fnet=ma,

1N=1kg⋅m/s2.

Although almost the entire world uses the newton for the unit of force, in the United States, the most familiar unit of force is the pound (lb), where 1 N = 0.225 lb. Thus, a 225-lb person weighs 1000 N.

Weight and Gravitational Force

When an object is dropped, it accelerates toward the center of Earth. Newton’s second law says that a net force on an object is responsible for its acceleration. If air resistance is negligible, the net force on a falling object is the gravitational force, commonly called its weight w⃗ , or its force due to gravity acting on an object of mass m. Weight can be denoted as a vector because it has a direction; down is, by definition, the direction of gravity, and hence, weight is a downward force. The magnitude of weight is denoted as w. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. Using Galileo’s result and Newton’s second law, we can derive an equation for weight.

Consider an object with mass m falling toward Earth. It experiences only the downward force of gravity, which is the weight w⃗ . Newton’s second law says that the magnitude of the net external force on an object is F⃗ net=ma⃗ . We know that the acceleration of an object due to gravity is g⃗ , or a⃗ =g⃗ . Substituting these into Newton’s second law gives us the following equations.

WEIGHT

The gravitational force on a mass is its weight. We can write this in vector form, where w⃗ is weight and m is mass, as

w⃗ =mg⃗ .

In scalar form, we can write

w=mg.

Since g=9.80m/s2 on Earth, the weight of a 1.00-kg object on Earth is 9.80 N:

w=mg=(1.00kg)(9.80m/s2)=9.80N.