Physics
Assertion (A) : Weight is the force with which the earth attracts a body.
Reason (R) : It is a measure of the quantity of matter contained in the body, at rest.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Motion in One Dimension
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Answer
assertion is true but reason is false
Explanation
Assertion (A) is true because weight is defined as the gravitational force exerted by the Earth on a body :
where m is the mass and g is the acceleration due to gravity.
Reason (R) is false because mass is the measure of the quantity of matter and weight is the force due to gravity acting on that mass.
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Reason (R) : This is due to the lower value of 'g' on moon.
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In a supermarket, Avantika could easily push an empty trolley but found it difficult to push a trolley full of groceries. The loaded trolley accelerated very slowly even when the same force was applied. To keep the trolley moving, she had to apply a greater force.
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(b) According to you, which law of motion explains this observation?
(c) Why did Avantika have to apply a greater force to the loaded trolley?
(d) Correlate this event with one other similar example from daily life.