Q1. State and define the SI unit of force.
Q2. When balanced forces act on a stationary body, then the body is
deformed True or False
Q3. Why people sitting in bus fall backward when bus suddenly starts?
Q4. Why leaves fall when we are shacking branch of tree?
Q5. What will be the momentum of a stone having mass of 10 kg when it
is thrown with a velocity of 2 m/s?
Answers
Explanation:
Force is defined as the rate of change of momentum. For an unchanging mass, this is equivalent to mass x acceleration. So, 1 N = 1 kg m s-2, or 1 kg m/s2.
When two forces acting on a body are equal in magnitude but opposite in direction, then the forces are called balanced forces. In case of balanced force, a stationary body continues to be in its stationary position while a moving object will continue moving in the same speed and in the same direction.
Some leaves of a tree get detached when we shake its branches vigorously because branches comes in motion while the leaves tend to remain at rest due to inertia of rest.
20 kg m/s
We know that Momentum p = Mass m × Velocity v Therefore p = 10 kg × 2 m/s = 20 kg m/s Thus the momentum of the stone = 20 kg m/s.
When the bus starts moving suddenly, the lower part of the body of passengers, which is in contact with the bus, come in motion, but upper part of their body tends to be in the state of rest and the passengers fall backward.
Answer:
newton is si unit
false
inertia of rest
inertia of rest
p=20
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