Question

Q1. What is the relation between mass and weight? The mass of an object is 3.4 kg. Find its weight.

Q2. Distinguish between the density and the relative density of a substance.

Q3. What is circular motion? How it is

different from rotatory motion?

Q4. What is one oscillation of a simple pendulum? How does the time period of a simple pendulum depend on its length, the amplitude of its oscillations and the mass of the bob?

Q5. What is the law of conservation of energy? Why does a simple pendulum not keep swinging forever under ordinary circumstances?Q6. What is potential energy? In what ways can a body acquire potential energy?

Q7. Give 3 advantages of using electrical energy?

Q8. Define reflection and its two laws.

Q9. What is meant by lateral inversion? Write laterally inverted image of STAR.Q10. (i) Differentiate between real and virtual image.

(ii) What does the hatching in a drawing of a mirror represent ?

Q11. Distinguish between regular and diffused reflection. Also draw the diagram showing regular and diffused reflection.

Q12. Give the transformation of energy in the following examples: torch cells c)

a) moving fan b)bursting crackers

Q13. Give four characteristics of an image formed by a plane mirror.​

Answer 1

Answer:

1st In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.[1] In other words, an object with a mass of 1.0 kilogram weighs approximately 9.81 newtons on the surface of the Earth, which is its mass multiplied by the gravitational field strength. The object's weight is less on Mars, where gravity is weaker, and more on Saturn, and very small in space when far from any significant source of gravity, but it always has the same mass.

Answer 2

Answer:

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