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標題:
HI A physics mc question
2003 CE phy mc 08 Please answer with explanations
最佳解答:
There are 2 forces acting on the child exerted by the safety seat. ( 1 ) Horizontal ( which brings the child to accelerate with the car ) ( 2 ) Vertical ( normal reaction ) ( 1 ) , By F = ma, Horizontal force = 10 x 3 = 30N ( 2 ) As the child does NOT have vertical acceleration, normal reaction balances his weight. Vertical force = mg = 10 x 10 = 100N As the question is asking about the resultant force, we then combine these 2 forces by Tip-to-tail Method. Magnitude of resultant force ( By Pyth. theorem ) = √( 302 + 1002 ) = 104 N ( correct to nearest 1N ) So, the answer is C
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發問:2003 CE phy mc 08 Please answer with explanations
最佳解答:
There are 2 forces acting on the child exerted by the safety seat. ( 1 ) Horizontal ( which brings the child to accelerate with the car ) ( 2 ) Vertical ( normal reaction ) ( 1 ) , By F = ma, Horizontal force = 10 x 3 = 30N ( 2 ) As the child does NOT have vertical acceleration, normal reaction balances his weight. Vertical force = mg = 10 x 10 = 100N As the question is asking about the resultant force, we then combine these 2 forces by Tip-to-tail Method. Magnitude of resultant force ( By Pyth. theorem ) = √( 302 + 1002 ) = 104 N ( correct to nearest 1N ) So, the answer is C
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