Question 1:
Give two examples each of situations in which you push or pull to change the state of motion of objects.
Answer:
Two examples of push force are as follows:
(i) A heavy box at rest is pushed to move it from one room to another. This changes the state of motion of the box.
(ii) A player pushes a football using his foot. This changes the state of motion of the ball.
Two examples of pull force are as follows:
(i) Rope is pulled to draw water from a well. This changes the state of motion of the water bucket.
(ii) A drawer is pulled to open it. This changes the state of motion of the drawer.
Question 2:
Give two examples of situations in which applied force causes a change in the shape of an object.
Answer:
Two examples of forces that cause a change in the shape of an object are as follows:
(i) Squeezing of a plastic bottle changes the shape of the bottle.
(ii) Deformation of clay by pressing it between the hands.
Question 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.
Answer:
(a) To draw water from a well we have to __pull__ at the rope.
(b) A charged body __attracts__ an uncharged body towards it.
(c) To move a loaded trolley we have to __either push or pull__ it.
(d) The north pole of a magnet __repels__ the north pole of another magnet.