Advertisements
Advertisements
प्रश्न
Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.
Advertisements
उत्तर
We make use of muscular force to hold a bucket of water above the ground. This muscular force acts against the force of gravity that pulls the bucket towards the ground. The two forces are equal in magnitude but opposite in direction. Therefore, the net force on the bucket is zero. Hence, there is no change in its state of motion.
संबंधित प्रश्न
A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
Match the following:
| Group ‘A’ | Group ‘B’ | ||
| (i) | An ox pulling a cart | (a) | Magnetic force |
| (ii) | Lifting a heavy iron object with a crane | (b) | Electrostatic force |
| (iii) | Weighing with a spring balance | (c) | Muscular force |
| (iv) | Applying brakes to a bicycle | (d) | Gravitational force |
| (v) | Picking up pieces of paper with a plastic scale | (e) | Frictional force |
One or more forces are acting in the following example. Name them.
An aeroplane flying in sky: ______
One or more forces are acting in the following example. Name them.
Squeezing sugarcane juice with a squeezer: ______
Why powder is sprinkled on a carrom board?
Write an answer to the following question in your own words.
What are the things that can be done by applying force?
Force executed by touching the body is called non–contact force.
Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in Fig. 9.1. Calculate the acceleration and frictional force of the floor on the ball.

When two bottles with magnets float on water and are brought close together, they move toward each other. Which condition causes this?
Two floating bottles with magnets repel each other at first, but attract when one magnet is reversed. What does this experiment demonstrate?
