Spring Balance
Spring Balance
It is a simple device that can be used for measuring the force acting on body. We can measure the weight of a body. as it is the force with which the object is being pulled by the Earth towards its centre. Spring balance is based on the principle of spring force.
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Spring balance was invented by British physicist Robert Hooke in 1660. It is used to measure the weight of the object. Spring balance consists of a spring with a hook attached at one end. It has a pointer which can move on a graduated scale indicating the weight. The load is hung in the hook provided on the spring, it expands and this expansion is proportional to the weight of the object. The object to be weighed is attached to the hook of spring balance which is held vertically either from a hook or with a hand. The spring gets stretched due to gravitational pull and hence, the pointer slides downward on the engraved scale. The working principle of the spring balance is Hooke's law. It can be defined as F=−kx. Where F is the force and x is the displacement of the pointer. A spring balance measures the weight of an object by opposing the force of gravity with the force of an extended spring. |
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What is the main use of spring balances ?
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| Right Option : A | |||
| View Explanation | |||
Spring balance is used to measure ___________________ . | |||
| Right Option : B | |||
| View Explanation | |||
In the given diagram, when a weight of 100 g is hung from the spring, its length is 9 cm. When a weight of 150 g is hung from it, its length is 11 cm. What is the length of the spring when there is no weight hanging from it ? | |||
| Right Option : C | |||
| View Explanation | |||
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