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EASE 3 Exercise
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ball A is given negative charge. a polythene rod is charged by rubbing it with woolen clothes. It will attract balloon A. What charge does the balloon A in third experiment?
positive charge
ball A is given negative charge. a polythene rod is charged by rubbing it with woolen clothes. It will attract balloon A. What particles are transferred from the cloth to the rod when it become charged?
Electrons
ball A is given negative charge. a polythene rod is charged by rubbing it with woolen clothes. It will attract balloon A. What charge does the rod have after rubbing?
negative charge
complete the last column to show whether you would expect the balloons to attract or repel one another. p? q?
p= attract, q= repel
Calculate the weight labeled A in the diagram.
m1=m2 | F1 x A1=F2 x A2 | 4 N x 3 m = A x 2 m | A = 6 N
Which lever will make it easiest to move the rock?
B
When an object is charged, which of the above changes?
B. the number of electrons
How can neutral polythene becomes negatively charged after rubbed with wool?
2. Negative charge moves from the wool to the polythene
Tendency of a force to rotate a rigid body about any defined axis is called as ______
moment
What can the boys do to balance the seesaw?
Boy W moves closer to F
An object A has a positive charge and it attracts object B. If object A is placed near object C, they attract each other. Object C also attracts object D. What is the electric charge of object B, C, and D?
B (-), C (-), D (+)
Which point is the pivot?
B
A force of 4 N acts on a lever 2 m from the pivot. What is the moment?
8 Nm
What will a positively charged object brought close to a negatively charged object do?
attract
A Van de Graaff generator makes your hair stand on end because…
2. each strand of hair picks up the same charge and repels each other
What force causes an object to become charged when it is rubbed?
magnetic
Which point label the electron?
D
Calculate the moment of the force about the pivot.
4 Nm
What will happen to the seesaw when both people get on?
it will turn in an anti-clockwise direction
Aluminum, glass, plastic, wood. Out of those four, which material could you put in the gap to make reading on the meter?
Aluminum
Mike and Oliver sit on a see-saw. Mike sits 2 m away from the pivot and weighed 500 N downward, while Oliver is x meter away from the pivot and weighed 1000 N. What is the value of x?
1.0 m
Which class lever does the photo show?
class 1: A and C, class 3: B
What is the force F needed to balance the see-saw?
m1=m2 | F1 x A1=F2 x A2 | F x 7=700 x 3 | F = 300 N
What are the charges on sides X and Y of the sphere?
X = - (N) || Y = + (P)
Which of the given conditions above increases the moments?
i and ii
A class 2 lever has the _________ in the middle
load
SI unit of charge is?
Coulomb (C)
If the clockwise and anticlockwise moments on a seesaw are equal, what will happen?
The seesaw is balanced and will not move.
The one with minus sign is called
electron
Lightning is an example of charging materials by
friction
An example of a class 2 lever type is
nutcracker
Some materials which allow an electric current to flow through them are called
conductor
Fill in the blanks with appropriate order of the words.
negative, positive
Where is the position of the pivot?
C
By using the principle of moment, determine the direction of the see-saw as shown.
Turning in the clockwise direction