Newton's Third Law
Since action and reaction forces are always equal and opposite, how can motion then take place?
Derive the law of conservation of momentum from Newtons third law of motion.
- linear momentum
- on same body
- on different bodies
- at different times
- at same time
- They must act on different objects in the same direction.
- They must act on different objects in opposite directions.
- They must act on the same object in the same direction.
- They must act on the same object in opposite directions.
State Newtons first law of motion. Explain it by giving an example.
- Newton's first law of motion
- Newton's second law of motion
- Newton's third law of motion
- Newton's law of gravitation
Explain which of Newtons laws of motion are applicable in the following cases.
- A person swimming in water.
- A person gets hurt when jumping on the hard cement surface.
- A mango falls from the tree when the branch of the tree is suddenly shaken.
- The recoil of the gun when the bullet is fired from it.
- To compare accelerations produced in spheres of mass and , when equal force is applied to them.
Force can be defined as
newtons third law
- conservation of energy
- newton's third law
- archimedes' principle
State the first law of Newton.
Which law of newton defines force?
- uniformly accelerated
- 8 N
- 10 N
- 12 N
Electricity can be used to replace the fuel and power a rocket (using today's mechanism) just like an electric car.
True, as Electricity is also a form of energy.
False, as Electricity is not a source of energy.
False, as the rocket needs to throw out fuel in the opposite direction to move.
True, as the mechanism for car and rocket is similar.
Discuss the law of conservation of momentum.
- Mass of the Earth
- Radius of the Earth
- Mass of the satellite
- All of the above.
Water sprinkler used for grass lawns begins to rotate as soon as the water is supplied. Explain the principle on which it works
- the exhaust gases escape through the nozzle opposite to the earth and pushes downwards
- the exhaust gases escape through the nozzle opposite to the earth and pushes upwards
- the exhaust gases escape through the nozzle towards the earth and pushes downwards
- the exhaust gases escape through the nozzle towards the earth and pushes upwards
A man is at rest in the middle of a frozen pond. He can get himself to the shore by the implication of :
- Law of conservation of momentum
Newton's third law of motion
Newton's first law of motion
Law of gravitation
A boy hits the football with a large force, the action force acts on the football and same magnitude reaction force acts on the boy. What can be inferred from the statement?
Action and reaction force does not cancel each other.
Action force and reaction force are equal to each other.
Action and reaction forces acts on two different bodies.
All of the above
A body is kept on a table. The object is pushed downwards with a force equal to its weight. But the table exerts an equal and opposite force on the object, hence keeping it at rest.
If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :
F1 and F2 cannot be compared