1Fill in the blank: the condition of an object that changes its place compared with the things around it is called the state of ............ .
2Fill in the blank: the agent that changes the state of an object is called ............ .
3Fill in the blank: the S.I. unit of force is ............ .
4Fill in the blank: ............ must be used to bring a resting object into motion.
5Fill in the blank: the motion of a bullet leaving a gun is ............ motion.
6Fill in the blank: simple machines make work ............ and quicker.
7Write the difference between linear motion and curvilinear motion.
8Write the difference between motion and rest.
9Motion and rest are relative. How? Write with an example.
10Write the definition of force.
11Write the effects of force in points.
12What is transformation of force? Write with an example.
13Among the motions you have seen, which are linear and which are curvilinear? Write with examples.
14How can it be shown that force changes the state of an object? Write with examples.
15Which tools can carry force from one place to another? Write with examples.
16How can force be measured using a spring balance? Explain with a diagram.
17How does transformation of force take place when you sweep the floor at home with a broom?
18What is a simple machine? Write your answer.
19Write the main uses of simple machines in points.
20Why is a pulley used to draw water from a very deep well? How does it help in the work?
21Draw a clean diagram of each of these simple machines: (a) spade (b) scissors (c) pulley (d) khukuri.
22What is the approximate weight, in newtons, of an object of mass 5 kilograms on the surface of the earth?
23How is the change when a balloon is pressed different from the change when a balloon is blown up?
24Write the relation between a simple machine and a complex machine.
25In a football match, which effects of force are seen when the goalkeeper stops the ball and when a player kicks it?