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
When an elephant drags a wooden log over the land, the forces that are applied on the log are ______, ______ and ______.
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 an object thrown upwards comes down after reaching a point?
Why powder is sprinkled on a carrom board?
In what way are we different muscular force and mechanical force?
Write an answer to the following question in your own words.
What is meant by weight?
Solve the following crossword puzzle.
Down:
(1) _______ force is to be applied to push a scooter that has failed.
(2) _________ force can be used to pick up scattered pins.
Across:
(1) A _______ pulls an iron nail towards itself.
(3) ________ force was used when the farm was ploughed with a tractor.
(4) It is due to the force of _________ that raindrops fall to the ground.
What is the contact force?
There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have the highest inertia?
Which one of the following forces is a contact force?
