Question

table top
10.) We know that there is a huge amount of atmospheric pressure on us. But we do not
experience its effect why?
i) Two persons are applying forces on two opposite sides of a moving cart. The cart still
moves with the same speed in the same direction. What do you infer about the
magnitudes and direction of the forces applied?
ii) Observe the figures given below carefully.
(1)
200 ml
40 ml
400 ml
40 ml
A)
(C)
Volume of water in each vessel is shown above Arrange them in order of decreasing
pressure at the base of each vessel Explain the reason​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

n Class VII, you have learnt how

objects move. Do you recall how we

can decide whether an object is

moving faster than the other? What does

the distance moved by an object in unit

time indicate? You also know that a

moving object like a ball rolling on the

ground slows down. Sometimes it may

change its direction of motion. It is also

possible that the ball may slow down

and also change its direction. Have you

ever wondered what makes an object

slow down or go faster, or change its

direction of motion?

Let us recall some of our everyday

experiences. What do you do to make

a football move? What do you do to

make a moving ball move faster? How

does a goalkeeper stop a ball? A

hockey player changes the direction

of the moving ball with a flick of the

stick. How do fielders stop a ball hit

by a batsman? (Fig. 11.1). In all these

situations the ball is either made to

move faster or slower or its direction

of motion is changed.

We often say that a force has been

applied on a ball when it is kicked,

pushed, thrown or flicked. What is a

force? What can it do to bodies on which

it is applied? We shall seek answers to

such questions in this chapter.

11.1 Force – A Push or a Pull

Actions like picking, opening,

shutting, kicking, hitting, lifting,

flicking, pushing, pulling are often

used to describe certain tasks. Each

of these actions usually results in

some kind of change in the state of

motion of an object. Can these terms

be replaced with one or more terms?

Let us find out.