Question

State two differences between mass and weight.

Answer 1

Answer:

1.mass is always constant

weight became change by place to place.

2.mass is a scalar quantity.

weight is a vector quantity.

Answer 2

Explanation:

My science teacher is always saying the words "weight of an object" and "mass of an object," but then my physics book (that I read on my own) tells me completely different definitions from the way these words are used in my science class... so which is right?

What is the difference between the weight of an object and the mass of an object?

The mass, strictly the inertial mass, relates the acceleration of a body to the applied force via Newton's law:

F=ma

F=ma

So if you apply a force of 1 Newton to a mass of 1kg it will accelerate at 1m/s22. This is true whether the object is floating in space or in a gravity field e.g. at the Earth's surface.

The weight is the force a body exerts when it is in a gravitational field. The weight depends on the gravitational field. For example the weight of a 1kg mass at the Earth's surface is 9.81 Newtons, while at the surface of Mars it's about 3.5 Newtons.

This is possibly a bit too much info: if so ignore this last paragraph. Although weight specifically means the force exerted in a gravitational field, Einstein told us that sitting stationary in a gravitational field is equivalent to being accelerated in the absence of gravity. The inertial mass defined using Newton's laws is the same as the gravitational mass defined by the force a body exerts in a gravitational field. So if you take a 1kg mass at the Earth's surface, the weight of 9.81 Newtons it exerts is exactly the same as the force you'd need to accelerate the 1kg mass

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