Grade 9 physics unit 2 part 1 | Physical Quantity | Scales, Standards and Units

#physics #grade9 #unit2
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Second is a device used to measure time. 2. Candela is a derived physical quantity. 3. The unit of force can be derived from the units of mass, length and time. 4. One kilometer is 100 meter. 5. For a very large or very small numbers prefixes are used with SI units. 6. Scalar quantity can be described by its magnitude and direction. Part III: Short answer questions 1. What is the difference between interval scale and ratio scale? 2. How many seconds are there in 12 hours? 3. What is measurement? 4. What is the difference between traditional measuring units and scientific measuring units? 5. Define the following terms: a) Meter b) second c) kilogram d) length e) time f ) mass g) Physical quantity h) derived physical quantity i) fundamental physical quantity. j) scalar physical quantity k) vector physical quantity 6. Which SI units would you use for the following measurements? (a) the length of a swimming pool (b) the mass of the water in the pool (c) the time it takes a swimmer to swim a lap 7. Which instrument is used to measure the thickness of a sheet metal? 8. Write some safety rules. 9. Give three examples of scalar and vector quantities. Part IV: Workout problems

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