General Physics Questions And Answers
Q1.
Which law of Newton helps in finding the reaction forces on a body?
Answer :
Third Law
Q2.
What is the coefficient of restitution (e)?
Answer :
Ratio of final to initial relative velocities
Q3.
A ball traveling with some velocity v hits another ball elastically which is stationary. What will happen to the system?
Answer :
The stationary ball will start moving with a velocity v and the moving ball will come at rest
Q4.
Which of the following is not true?
Answer :
Energy cannot be transformed
Q5.
When a roller coaster is at the top of a steep hill, its potential energy is maximum. When it hurdles down the slope and comes to the bottom, the potential energy reduces greatly. Hence we can say that the law of conservation of energy is not valid here since energy is destroyed.
Answer :
False
Q6.
The elastic potential energy varies linearly with displacement.
Answer :
False
Q7.
The potential energy of an object cannot be increased by internal forces.
Answer :
True
Q8.
What are the types of kinetic friction?
Answer :
Sliding friction and rolling friction
Q9.
What is the SI unit of variable force?
Answer :
Newtons
Q10.
The momentum of a system can be changed without changing its kinetic energy.
Answer :
True
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