13. Newton’s Laws of Motion Newton’s First Law of Motion Newton’s Second law of Motion Newton’s Third Law of Motion
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19. 2nd Law F = ma 1 Newton is a force which causes a mass of 1 kilogram to have an acceleration of 1 ms -2 .
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22. Simple illustration of 3rd Law 1. Newton’s third law is a statement about the forces rather than about motion. 2. Action and reaction refer to forces. 3. This law plays important role in the development of the methods used to analyze the motion of extended bodies that rotate as they move through space.
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25. GCE O-Level Past Examination Paper Science (Physics)
26. Nov 1991 1. A horizontal force of 5 N was applied to a block of mass 2 kg resting on a frictionless table. What was the acceleration of the block? A 0.4 ms -2 B 2.5 ms -2 C 10 ms -2 D 25 ms -2 B Hint: F =ma
27. GCE O Nov 1994 2. A horizontal force of 5 N was applied to a block of mass 2 kg, resting on a frictionless table. What was the acceleration of the block ? A 0.4 ms -2 B 2.5 ms -2 C 10.0 ms -2 D 25.0 ms -2 B
28. Nov 1998 3. A horizontal force of 8 N is applied to to a block of mass 2 kg, resting on a frictionless table. What is the acceleration of the block? A 0.25 ms -2 B 4.0 ms -2 C 6.0 ms -2 D 16 ms -2 B Hint: F = ma
29. Nov 1990 4. A ball of mass 0.4 kg was thrown vertically into the air. It reached a maximum height of 3.0 m. (g = 10N/kg) a) What was the force on it at the highest point? [1] b) What was its acceleration at the highest point? [1] c) After it had fallen 1 m from its highest point, it’s acceleration was 8 m/s 2 . Why was it not 10m/s 2 .? [2] (a). At highest point, v = 0 a = 0 force = 0 N (b). Acceleration = 0 ms -2 (c ). due to air resistance, acceleration will gradually decreased from 10 ms -2 and hence after it had fallen to I m, a = 8 ms -2 .
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