5
Question Question 5
In the following situations, identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
(b) Taking out paste from a toothpaste tube.
(c) A load suspended from a spring while its other end is on a hook fixed to a wall.
(d) An athlete making a high jump to clear the bar at a certain height.
| S. No. | Agent | Object | Effect | Reason |
|---|---|---|---|---|
| a. | Fingers | Lemon | Shape of lemon changes | Muscular force is exerted on the lemon in order to extract its juice. As a result, the shape of the lemon changes. |
| b. | Fingers | Tooth paste tube | Shape of tooth paste tube changes | Muscular force is exerted on the tube in order to take out paste. As a result, the shape of the tube changes. |
| c. | Suspended load | Spring | The spring gets stretched. | The suspended load pushes the spring downwards. Hence, its shape changes. |
| d. | Athlete | Ground | Pushes the ground backwards and as a result takes a high jump to clear the bar at a certain height. | When the athlete pushes the ground with his feet, his feet exert a muscular force on the ground. Same magnitude of force is applied back by the ground on the athlete. This force allows them to jump over the bar. As a result, their state of motion gets changed. |