Science

Force and Pressure

Question:

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.
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Force and Pressure

Q 1.

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

Q 2.

Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.

Q 3.

Squeezing a piece of lemon between the fingers to extract its juice.

Q 4.

A load suspended from a spring while its other end is on a hook fixed to a wall.

Q 5.

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

Q 6.

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be esponsible for the attraction between the balloon and the wall?

Q 7.

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

Q 8.

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.

Q 9.

Taking out paste from a toothpaste tube.

Q 10.

An athlete making a high jump to clear the bar at a certain height.