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Mass

Mass. What is mass?. Mass is the measure of the amount of substance in a body. If mass in kilograms, what about weight? Shouldn’t weight be in kilograms instead?. Units. SI units: kg Other units: g, tonne. Conversion. 1 kg = 1000g 1 ton = 1000kg Can calculate what is 1 ton in grams?.

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Mass

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  1. Mass What is mass? Mass is the measure of the amount of substance in a body If mass in kilograms, what about weight? Shouldn’t weight be in kilograms instead? Units SI units: kg Other units: g, tonne Conversion 1 kg = 1000g 1 ton = 1000kg Can calculate what is 1 ton in grams?

  2. Mass Measuring Mass • The instruments used to measure mass are • Electronic balance • Beam balance

  3. Weight What is weight The weight of a body is the pull of gravity on that body Since weight is a force, it must be a vector… So which direction is our weight pointing? Units SI units: N (newton) Newton’s 2nd law Force = mass x acceleration Weight = mass x acceleration due to gravity W = m x g

  4. Acceleration Due to Gravity Comparison Acceleration Due Planets Mass [kg] Radius [m] g / g - Earth to Gravity, "g" [m/s ] 2 Sun Sun 1.99 x 10 1.99 x 10 30 30 6.96 x 10 6.96 x 10 8 8 274.13 274.13 27.95 27.95 Mercury Mercury 3.18 x 10 3.18 x 10 2.43 x 10 2.43 x 10 3.59 3.59 0.37 0.37 23 23 6 6 Venus Venus 4.88 x 10 4.88 x 10 24 24 6.06 x 10 6.06 x 10 6 6 8.87 8.87 0.90 0.90 Earth 9.81 Earth Earth 5.98 x 10 5.98 x 10 6.38 x 10 6.38 x 10 9.81 9.81 1.00 1.00 24 24 6 6 Moon Moon 7.36 x 10 7.36 x 10 22 22 1.74 x 10 1.74 x 10 6 6 1.62 1.62 0.17 0.17 Mars Mars 6.42 x 10 6.42 x 10 3.37 x 10 3.37 x 10 3.77 3.77 0.38 0.38 23 23 6 6 Jupiter Jupiter 1.90 x 10 1.90 x 10 6.99 x 10 6.99 x 10 25.95 25.95 2.65 2.65 27 27 7 7 Saturn Saturn 5.68 x 10 5.68 x 10 5.85 x 10 5.85 x 10 11.08 11.08 1.13 1.13 26 26 7 7 Uranus Uranus 8.68 x 10 8.68 x 10 2.33 x 10 2.33 x 10 10.67 10.67 1.09 1.09 25 25 7 7 Neptune Neptune 1.03 x 10 1.03 x 10 26 26 2.21 x 10 2.21 x 10 7 7 14.07 14.07 1.43 1.43 Pluto Pluto 1.40 x 10 1.40 x 10 1.50 x 10 1.50 x 10 0.42 0.42 0.04 0.04 0.04 0.04 22 22 6 6 Weight Acceleration due to gravity Sun Sun 1.99 x 10 1.99 x 10 30 30 6.96 x 10 6.96 x 10 8 8 274.13 274.13 27.95 27.95 Mercury Mercury 3.18 x 10 3.18 x 10 2.43 x 10 2.43 x 10 3.59 3.59 0.37 0.37 23 23 6 6 Venus Venus 4.88 x 10 4.88 x 10 24 24 6.06 x 10 6.06 x 10 6 6 8.87 8.87 0.90 0.90 Earth Earth 5.98 x 10 5.98 x 10 6.38 x 10 6.38 x 10 9.81 9.81 1.00 1.00 24 24 6 6 Moon Moon 7.36 x 10 7.36 x 10 22 22 1.74 x 10 1.74 x 10 6 6 1.62 1.62 0.17 0.17 Mars Mars 6.42 x 10 6.42 x 10 3.37 x 10 3.37 x 10 3.77 3.77 0.38 0.38 23 23 6 6 Jupiter Jupiter 1.90 x 10 1.90 x 10 6.99 x 10 6.99 x 10 25.95 25.95 2.65 2.65 27 27 7 7 Saturn Saturn 5.68 x 10 5.68 x 10 5.85 x 10 5.85 x 10 11.08 11.08 1.13 1.13 26 26 7 7 Uranus Uranus 8.68 x 10 8.68 x 10 2.33 x 10 2.33 x 10 10.67 10.67 1.09 1.09 25 25 7 7 Neptune Neptune 1.03 x 10 1.03 x 10 26 26 2.21 x 10 2.21 x 10 7 7 14.07 14.07 1.43 1.43 Pluto Pluto 1.40 x 10 1.40 x 10 1.50 x 10 1.50 x 10 0.42 0.42 22 22 6 6

  5. Weight Measuring Mass • The instruments used to measure mass are • Electronic balance • Beam balance

  6. Mass Vs Weight Get into groups of 4 and discuss: The differences between mass and weight 10mins

  7. Class Activity • Give the raw egg hard spin on its side • Stop the spin by placing a fingertip on the egg, the quickly lift the finger • What do you observe as you lift the finger?

  8. Inertia What is inertia? It is the reluctance of a body to start moving if it is stationary in the first instance OR It is the reluctance of a body to stop moving if it is moving in the first instance

  9. Inertia 100kg Vs 20kg Who is easier to push? Who is easier to stop? 100kg 20kg

  10. Density Container A Container B Can you tell the difference between the 2 containers?

  11. Density What is density? Density is defined as mass per unit volume Density = mass/volume Units M SI units: kg/m3 Other units: g/cm3 D V My Dear Valentine

  12. Density 2.70 Sink 19.0 Sink 1 Float 0.92 0.5 Float

  13. Density Get into groups of 4 and discuss: How you would help the King identify whether the crown was made of pure gold or not? Write your answers on the mahjong paper provided Present your solution to the class next lesson

  14. Concept Map kg/m3 Density Mass per unit volume defined as related to mass by D = M/V related to density by kg Mass, m defined as Amount of substance in a body related to weight by is a measure of inertia W = m x g where g is the gravitational force per unit mass acting on an object related to mass by N defined as Weight Gravitational force acting on an object

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