1. State Newton's second law of motion and derive the force equation.
2. If a 1200 W electric iron is used daily for 30 minutes, how much total
electricity is consumed in the month of September?
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Answers
Answer:
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Explanation:
1. Newton’s second law states that the acceleration of an object depends upon two variables – the net force acting on the object and the mass of the object. The acceleration of the body is directly proportional to the net force acting on the body and inversely proportional to the mass of the body. This means that as the force acting upon an object is increased, the acceleration of the object is increased. Likewise, as the mass of an object is increased, the acceleration of the object is decreased.
Newton’s second law can be formally stated as,
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
This statement is expressed in equation form as,
a=Fnetm The above equation can be rearranged to a familiar form as
F=ma Since force is a vector, Newton’s second law can be written as
F⃗ =ma⃗ The equation shows that the direction of the total acceleration vector points in the same direction as the net force vector.
2. Given that,
Power =1200W=1.2kWh
Time = 30 min / day × 30 days =0.5h×30= 15 h
Energy =Power×Time=1.2×15= 18kWh.
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Answer:
1).Newton 2nd law of Motion state that"The rate of change of momentum is directly proportional to the applied forces and the change takes place in the direction of applied force.