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Mass and weight

Mass and weight. Lesson Aims. To understand the difference between mass and weight. To be able to calculate the weight of known masses. IN THE BLUE CORNER… WEIGHT!!!. IN THE RED CORNER… MASS!!!. WEIGHT IS THE FORCE OF GRAVITY ON A MASS. MASS IS HOW MUCH ‘STUFF’ SOMETHING HAS.

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Mass and weight

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  1. Mass and weight

  2. Lesson Aims • To understand the difference between mass and weight. • To be able to calculate the weight of known masses.

  3. IN THE BLUE CORNER… WEIGHT!!! IN THE RED CORNER… MASS!!!

  4. WEIGHT IS THE FORCE OF GRAVITY ON A MASS MASS IS HOW MUCH ‘STUFF’ SOMETHING HAS

  5. WEIGHT IS MEASURED IN NEWTONS MASS IS MEASURED IN KILOGRAMS

  6. WEIGHT CHANGES DEPENDING ON GRAVITY MASS REMAINS CONSTANT

  7. To a scientist, weight and mass are two very different things. Mass = the amount of ‘stuff’ which makes something up. (measured in g / kg). Weight = force of gravity pulling down on you (measured in N). Complete the worksheet-weight and mass.

  8. We know that gravity pulls us down towards the centre of the earth. On Earth, gravity pulls on every 1kg with a force of 10N, (10N/Kg), so an object with a mass of 1kg will have a weight of 10N. Therefore, to calculate weight on Earth, you simply multiply the mass by 10.

  9. How to calculate weight Calculate the weight of Mr Gabb on Earth. His mass is approximately 85kg (on a good day). Mass x 10 = weight 85 x 10 = 850N After Christmas, his mass goes up to about 87kg, what will his weight be? Mass x 10 = weight 87 x 10 = 870N

  10. Jeff’s Space Journey

  11. Jeff’s mass is 300 Kg • The gravity on Earth is 10 ms-1 • If weight = mass x gravity • Then Jeff’s weight on Earth = 300 x 10 • On Earth Jeff weighs 3000 N !! Jeff’s starts on Earth

  12. Jeff’s mass is 300 Kg

  13. Jeff’s mass is 300 Kg • The gravity on the Moon is 1.6 ms-1 Jeff’s goes to the Moon

  14. Jeff’s mass is 300 Kg • The gravity on Mars is 3.7 ms-1 Jeff’s goes to Mars

  15. Jeff’s mass is 300 Kg • The gravity on Jupiter 23 ms-1 Jeff’s goes to Jupiter

  16. Jeff’s mass is 300 Kg • The gravity on Saturn is 9 ms-1 Jeff’s goes to Saturn

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