Q1 of 10 Page 143

Give two examples each of situations in which you push or pull to change the state of motion of objects.

Two examples of push force are as follows:

1) A chair at rest is pushed to move it from one room to another. This changes the state of motion of the box.


2) A player pushes a ball using his cricket bat. This changes the state of motion of the ball.


Two examples of pull force are as follows:


1) Rope is pulled to draw water from a well. This changes the state of motion of the water bucket.


2) A darwer of a desk is pulled to open it. This changes the state of motion of the drawer.


More from this chapter

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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.

 4

An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms.

muscular, contact, non-contact, gravity, friction, shape, attraction


(a) To stretch the bow, the archer applies a force that causes a change in its __________.


(b) The force applied by the archer to stretch the bow is an example of __________ force.


(c) The type of force responsible for a change in the state of motion of the arrow is an example of a __________ force.


(d) While the arrow moves towards its target, the forces acting on it are due to __________ and that due to __________ of air.

 5

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.