7. 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?
8. 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.
9. 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
ith its norrle kept in water, air in
Answers
Question :
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?
Answer :When a balloon is rubbed with a cloth, the electrons from the atoms of the cloth enter the atoms of the balloon and the number of electrons in the atoms of balloon becomes more than the number of protons. Because of that, there is a negative charge in the balloon, and in the cloth the number of electrons in its atoms become less than the number of protons, so it's positively charged.
Here Electrostatic force is responsible.
Question :
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.
Answer : Muscular force is used to hold the bucket containing the water and gravitational force is pulling the water down. Here, both muscular force and gravitational force are equal. Therefore, there is no change in state of motion of bucket.
Question : 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 .
Answer : The two forces acting on the rocket immediately after leaving the launching pad are gravitational force and frictional force. The gravitational force acts downwards towards the earth and frictional force acts due to surrounding air.
Answer:
7. An electrostatic force is responsible for the attraction between the ball and the wall. When we rub the balloon with a synthetic cloth, it gets charged and when the balloon is taken near the wall, it will get attracted to the uncharged wall because of the electrostatic force.
8. Forces acting on a plastic bucket containing water held above the ground level in our hand are muscular forces and gravitational forces. Both the forces are same in magnitude but in opposite directions and therefore there is no change in state of its motion.
9. The two forces acting on the rocket immediately after leaving the launching pad are gravitational force and frictional force. The gravitational force acts downwards towards the earth and frictional force acts due to surrounding air.
Hope you got your answer
Have a great day ahead
Take care