Author: admin
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Calculation of Weight from Mass
Suppose a body possesses a large mass and a large weight and this body is a very large object that is hard to throw because of its weight. Therefore by using Newton’s second law which states that the magnitude of the acceleration is ‘g’ for an object which is freely falling. Therefore, if the mass…
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What is Mass?
The mass of a body can be defined as the measure of the amount of matter that is present inside the body. Its SI unit is kilograms (kg). For a given body, the mass rarely changes for any given time. However, if a large amount of energy is taken out or given to the body,…
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Formula and Calculation of Weight
The measure of the force of gravity that is acted upon a body is known as its weight. It is denoted by w. In mathematical terms, weight can be described as the product of mass and acceleration due to gravity. W = mg Since weight is considered a force, its SI unit is also considered…
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Why does mass remain the same but weight changes on different planets?
The mass of an object is the measure of its contents but weight is the force due to gravity. And, the force due to gravity changes on different planets. We know, that on earth g = 9.8 m/s2 And on moon its, g = 1.6 m/s2 Let’s understand this by an example: Example: 1. Calculate…
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Difference between mass and weight
Weight is the force due to gravity on a mass. So, mass remains constant but weight changes according to the change in the gravitational field. W = mg or m = W/g Solved Examples 1. Calculate the mass of a body if the density and volume of a body are 2 Kg/m3 and 5 m3.…
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Difference Between Mass and Weight
Mass is a quantity that gives an idea about how much matter is present in an object. It is a quantitative measure of inertia. And acceleration is inversely proportional to inertia. The relation between force and mass is given by: F = ma or m = F/a The relation between density, mass, and volume is…
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More Examples on Average Speed
Rahul runs 4 miles from his house to the playground in 2 hours every day. What is his average speed? Ans: Average Speed = total distance ÷ total time Average Speed = 4 miles ÷ 2 hours Average Speed = 2 miles per hour Rahul runs 4 miles from his house to the playground in 2…
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Solved Examples on Average Speed
A train travels at a speed of 300 km/hr for 2 hours and then slows down to 220 km/hr for the next 2 hours. What is the average speed of the train? Solution: Distance covered in the first 2 hours, D1 = 300 * 2 = 600 miles Distance covered in the next 2 hours,…