Answers Weight (p4 5) The shuttle is getting (a) 3000 J – further away from the 155 J Mass is a measure of surface of the Earth. 2000 N how much of an object is 20 N there. It is measured in kg. 85 kg 10 m Weight is a downward 45 m force caused by gravity. (a) 372 N It is measured in N. 2418 N 16 800 J 372 N (a) 30 N 0 N 300 N 2.25 N 30 kg 75 kg 40 m 30 kg 8 N/kg Saturn 3 x 107 J 26 N/kg (a) 13 N/kg 25 km (a) 30 N 1 N Person pushes down 7890 N 650 N on scales. Scales push 12 000 N back up on person. 6960 J The weight of the Work Done (p6 7) 4.5 N – space shuttle decreases. This is because: Work done is the There is less mass due energy transferred to an to fuel being used up. object.
Answers Weight (p4 – 5) Mass is a measure of how much of an object is there. It is measured in kg. Weight is a downward force caused by gravity. It is measured in N. (a) 30 N 2.25 N 30 kg 30 kg 8 N/kg 26 N/kg (a) 30 N 1 N 650 N 12 000 N The weight of the space shuttle decreases. This is because: There is less mass due to fuel being used up. The shuttle is getting further away from the surface of the Earth. 85 kg (a) 372 N 2418 N 372 N 0 N 75 kg Saturn (a) 13 N/kg Person pushes down on scales. Scales push back up on person. Work Done (p6 – 7) Work done is the energy transferred to an object. (a) 3000 J 155 J 2000 N 20 N 10 m 45 m 16 800 J 300 N 40 m 3 x 107 J 25 km 7890 N 6960 J 4.5 N
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