Gravitational potential 729 J Work done is the energy energy is the work done in 900 kg transferred to an object. moving an object from the 6 kg ground to a certain height. 8 m s-1 3000 J 0.8 m s-1 (a) 155 J (a) 60 J 2000 N 3750 J 3384 J 20 N 5 kg 10 m 8.5 kg 0.1 kg 45 m 7 N kg-1 26 N kg-1 150 m/s 16 800 J 45 m 1500 m (a) 31.3 m s-1 300 N 587 000 J (to 3 s.f.) (a) 520 N 40 m 4680 J (a) to reduce frictional 4680 J forces so that the speed of 3 x 107 J the trolley won’t drop as 6.75 J much as it moves along the 25 km air track. 6.75 J (b) 0.008 J (approximately) 7890 N 54 kg 6960 J 150 m 4.5 N (a) 4 N kg-1 Mercury or Mars Conservation of Energy – Falling Objects (p12 13) Kinetic Energy (p10 11) – – (a) 0.513 J Gravitational Potential Energy Mass, Speed 0.513 J (p8 9) – 4.24 m s-1 (a) 27 J
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 Gravitational Potential Energy (p8 – 9) Gravitational potential energy is the work done in moving an object from the ground to a certain height. (a) 60 J 3750 J 5 kg 8.5 kg 7 N kg-1 26 N kg-1 45 m 1500 m (a) 520 N 4680 J 4680 J 6.75 J 6.75 J 54 kg 150 m (a) 4 N kg-1 Mercury or Mars Kinetic Energy (p10 – 11) Mass, Speed (a) 27 J 729 J 900 kg 6 kg 8 m s-1 0.8 m s-1 3384 J 0.1 kg 150 m/s (a) 31.3 m s-1 587 000 J (to 3 s.f.) (a) to reduce frictional forces so that the speed of the trolley won’t drop as much as it moves along the air track. (b) 0.008 J (approximately) Conservation of Energy – Falling Objects (p12 – 13) (a) 0.513 J 0.513 J 4.24 m s-1