Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
From the given velocity − time graph, acceleration of the bll,
a = `("Change in velocity")/("Change in time")`
= `(0 - 80)/(8 - 0) "ms"^-2`
= −10 ms−2
Frictional force of the floor o the ball = m
= (0.05 × 10) N (∵ m = 50g = 0.05 kg)
= 0.5 N
APPEARS IN
संबंधित प्रश्न
An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?
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 |
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?
Where do we apply a force while walking?
Two rods of the same weight and equal length have different thickness. They are held vertically on the surface of sand as shown in figure. Which one of them will sink more? Why?
A person lifting a heavy bag from the ground is primarily using which type of contact force?
A coconut falls from a tree to the ground. Which force is responsible for this?
When two bottles with magnets float on water and are brought close together, they move toward each other. Which condition causes this?
Contact forces arise mainly due to ______.
