Physics
A spring balance works on the principle of :
- gravitational force
- magnetic force
- restoring elastic force
- frictional force
Answer
restoring elastic force
Reason — In a spring balance, a spring is fixed at one end with a hook attached to an object at the other end. When the spring is stretched, the spring exerts a force F opposite to the direction of displacement of its free end, the magnitude of this force is directly proportional to the magnitude of displacement. This force is restoring force.
Related Questions
The magnitude of a non-contact force between two bodies …………… with an increase in their separation and …………… with a decrease in their separation.
- increases, decreases
- decreases, increases
- increases, increases
- decreases, decreases
On double the separation between two bodies the magnitude of the non-contact force between them becomes :
- one-eighth
- one-half
- one-fourth
- remains the same
A horizontal spring with two object A and B attached to its ends are shown in the figure below. If the spring is compressed, it …………… each object and if it is stretched, it …………… each object.
- pushes, pulls
- pulls, pushes
- pushes, pushes
- pulls, pulls
Define a contact force.