State the 3 laws of Newton. What is the acceleration of an object in free fall a

Question

State the 3 laws of Newton. What is the acceleration of an object in free fall at the end of 5, 10, 15 seconds? If one is standing in the aisle of a bus undergoing constant velocity, would one have to lean to compensate for the jerky motion? Defend your answer. Two skaters facing each other push off and travel away from each other. One skater has a speed of .50 m/s and weighs 735 N. What is the other skater's speed if he has pushed off and has a weight of 490 N? Which of the 3 Laws of Newton is like the Law of Conservation of Momentum? Defend your answer.

Explanation / Answer

1)

Newton's first law states that an object will continue to be in uniform motion or rest until and unless a force is applied. i.e to move a stationary object or to stop a moving object we have to apply force.It is also known as statement of inertia.

Newton's second law states that the rate of change of momentum of a body, is directly proportional to the force applied and this change in momentum takes place in the direction of the applied force. F = m*a where F is force applied , m is mass of the object and a is the accelration.

Newton's third law states that for each and every action there is an equal and opposite reaction. i.e he second law states that the rate of change of momentum of a body, is directly proportional to the force applied and this change in momentum takes place in the direction of the applied force.

2) accelration of free fall always remains constant as it falls freely under the influence of gravity and accelaration due to gravity is constant at 9.8 m.s-2 and hence

at 5,10,15 seconds accelaration due to gravity will be 9.8 m.s-2

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