Unit3_assignment PHY.docx

Unit3_assignment PHY.docx - PHY 1001 Unit Three – Forces...

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PHY 1001 Unit Three – Forces and Newton’s Laws of Motion Mathematical Assignment 1. The mass of a train is 30,000 kg. If the train accelerates at 1.1 m/s 2 , what net force (in Newtons) acts on the train? Key Idea Stock of Data and F ma 2 30,000 1.1 / m kg a m s Solution 2 30000 1.1 / 33,000 F kg m s F N Sanity Check Unit analysis: 2 m unit of F kg N s Estimation of magnitude: 30000 1.1 33,000 F F 2. What is the weight (in Newtons) of a 1 kg object? Key Idea Stock of Data and W mg 2 1 9.8 / m kg g m s Solution
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2 1 9.8 / 9.8 W kg m s W N Sanity Check Unit analysis: 2 m unit of W kg N s Estimation of magnitude: 1 9.8 9.8 W W   3. A rocket with a mass of 4,000 kg has an engine that exerts a force of 40,000 N. What is the rocket's acceleration (in m/s 2 ) at take-off? Key Idea Stock of Data and F ma F a m 4000 40,000 m kg F N Solution 2 40,000 4000 10 / N a kg a m s Sanity Check Unit analysis: 2 2 / / N kgm s unit of a m s kg kg Estimation of magnitude:
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40,000 4000 10 a a
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