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 responsible for the attraction between the balloon and the wall?
Solution and Explanation
The force which is responsible for the attraction between the ball and the wall is electrostatic force.
When we rub the balloon by a synthetic cloth, it gets charged. When it is taken near the wall, it will get attracted towards the uncharged wall because of the electrostatic force which is the force exerted by a charged body on another uncharged body.
Top Questions on Contact Forces
- 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.
1. Squeezing a piece of lemon between the fingers to extract its juice.
2. Taking out paste from a toothpaste tube.
3. A load is suspended from a spring while its other end is on a hook fixed to a wall.
4. An athlete making a high jump to clear the bar at a certain height.- CBSE Class VIII
- Science
- Contact Forces
- Fill in the blanks in the following statements.
1. To draw water from a well we have to ___ at the rope.
2. A charged body ___ an uncharged body towards it.
3. To move a loaded trolley we have to ___ it.
4. The north pole of a magnet ___ the north pole of another magnet.- CBSE Class VIII
- Science
- Contact Forces
Questions Asked in CBSE Class VIII exam
- For each of the following numbers, find the smallest whole number by which it should be multiplied so as to get a perfect square number. Also find the square root of the square number so obtained.
- 252
- 180
- 1008
- 2028
- 1458
- 768
- CBSE Class VIII
- Square Roots
Say whether the following are true or false.
1. Ignesious lost his wife, two children, his father-in-law, and his brother-in-law in the tsunami.
2. Sanjeev made it to safety after the tsunami.
3. Meghna was saved by a relief helicopter.
4. Almas’s father realised that a tsunami was going to hit the island.
5. Her mother and aunts were washed away with the tree that they were holding on to.
- CBSE Class VIII
- The Tsunami
Fill in the blanks using the correct form of the verbs in brackets.
My little sister is very naughty. When she ____ (come) back from school yesterday, she had _____(tear) her dress. We _____(ask) her how it had _____(happen). She ______(say) she _____ _____ (have, quarrel) with a boy. She _____ _____ (have, beat) him in a race and he _____ ____ (have, try) to push her. She _____ ____ (have, tell) the teacher and so he _____ _____ (have, chase) her, and she _____ _____ (have, fall) down and _____ _____ (have, tear) her dress.
- CBSE Class VIII
- The Best Christmas Present in the world
- Consider the following parallelograms. Find the values of the unknowns \(x, y, z\).
- CBSE Class VIII
- Kinds of Quadrilaterals
- In the tsunami 150,000 people died. How many animals died?
- CBSE Class VIII
- The Tsunami