Teacher's Diary

pushing/pulling/picking/hitting/lifting/lowering/ Push Pull
flying/kicking/ throwing/shutting/flicking

1 Moving a book placed on a Pushing Pulling Lifting – Yes Yes
table

2 Opening or shutting a door

3 Drawing a bucket of water
from a well

4 A football player taking a
penalty kick

5 A cricket ball hit by a batsman

6 Moving a loaded cart

7 Opening a drawer

Table 2:

Action of Force

Description of How to apply Change in state
situation force
Diagram of Change in Shape

motion

Yes No Yes No

A lump of dough on a plate Pressing it down with your
hands
Spring fixed to the seat of a
bicycle By sitting on the seat

A rubber band suspended from By hanging a weight or
ahook/nail fixed on a wall bypulling its free end

A plastic or metal scale By putting a weight at
placedbetween two bricks thecentre of the scale

 Watching videos based on force
1. http://www.youtube.com/watch?v=9tg3csrFVJw
2. http://www.youtube.com/watch?v=-B5IBoZ08-I

ASSIGNMENT
1. Give two examples each of situations in which you push or pull to change the

state of motion of objects.

2. Give two examples of situations in which applied force causes a change in the
shape of an object.

3. Fill in the blanks in the following statements:

(a) To draw water from a well we have to ——— at the rope.
(b) A charged body ———— an uncharged body towards it.
(c) To move a loaded trolley we have to ———— it.
(d) The north pole of a magnet ———— the north pole of another magnet

1. 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.
A blacksmith hammers a hot piece of iron while making a tool. How does the force due
to hammering affect the piece of iron?