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Work Done
- 1. Work Done Learning Objectives: 5- Use the work done equation correctly 6/7 - Rearrange the equation and use it in different forms 8 – Use powers to express or convert units of work What is mass measured in? What is weight measured in? What causes weight? What is energy measured in?
- 2. What have theygot in common? 1. Discuss your ideas with your partners 2. When asked, share your ideas with another pair 3. Decide on your group opinion and be ready to explain it W = Fd W = Work done (J) F = Force (N) d = Distance moved (m)
- 4. work done (joule,J) = force (newton, N) × distance (metre, m)
- 5. Exercise Mass (kg) Weight (mass x 10N/kg)This if the force!! (N) Distance per rep (use only the upward distance) (m) Number of reps Total distance (distance per rep x No. reps) (m) Work done (Force x total distance) (J) Squats (use your bodyweight for mass) Bicep curls (using text books) Step ups (use your bodyweight for mass)
- 6. Exercise Mass (kg) Weight (mass x 10N/kg) (N) Distanceper rep (use only the upward distance) (m) Number of reps Total distance (distance per rep x No. reps) Work done (Force x total distance) (J) Squats (use your bodyweight for mass) 80 800 0.6 10 6 4,800J Triceps dips (Use half your bodyweight for mass) 40 400 0.4 10 4 1,600J Bicep curls 5 50 0.7 10 7 350J Wrist curls 1 10 0.08 10 0.8 8J Step ups (use your bodyweight for mass) 80 800 0.25 10 2.5 2,000J
- 7. Easy – 1Mark Medium – 2 Marks Hard – 3 Marks Write the equation to calculate work done. What is the work done if we apply a 1.2N force and we move 4m in the direction of force? Walking up a flight of stairs, what are the energy transfers? Rearrange this equation for force applied. What is the work done if we apply a 7N force and we move 8m in the direction of the force? When you roll a ball down a hill what are the energy transfers? Rearrange this equation for distance moved in the direction of force. What distance is moved if we have a 8N force and the work done is 90J? What is the work done when a force of 5kN is applied to a ball and it moves 0.8km? What is the unit of force? What is the distance moved if we have a 70N force and work done is 8J? What is the work done to a car if a force of 9kN is applied and it moves 7km? What is the unit of work done? What force is required to move 7m if the work done is 9J? What force is required if 2.5kJ moves and object 56cm?
- 8. Easy – 1Mark Medium – 2 Marks Hard – 3 Marks Write the equation to calculate work done. W = Fd What is the work done if we apply a 1.2N force and we move 4m in the direction of force? 4.8J Walking up a flight of stairs, what are the energy transfers? kinetic (walking), GPE (height) (chem in food and thermal in body) Rearrange this equation for force applied. F = W/d What is the work done if we apply a 7N force and we move 8m in the direction of the force? 56m What energy transfers when a ball rolls down a hill? GPE to kinetic (also thermal) Rearrange this equation for distance moved in the direction of force. d = W/f What distance is moved if we have a 8N force and the work done is 90J? 11.3m What is the work done when a force of 5kN is applied to a ball and it moves 0.8km? 4MJ (4,000,000J) What is the unit of force? Newtons (N) What is the distance moved if we have a 70N force and work done is 8J? 0.1m What is the work done to a car if a force of 9kN is applied and it moves 7km? 63MJ (63,000,000J) What is the unit of work done? Joules (J) What force is required to move 7m if the work done is 9J? 1.3N What force is required if 2.5kJ moves and object 56cm? 4.5kN (4,464N) 24+ = 8 21-23 = 7 18-20 = 6 15-17 = 5
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- 11. Bicep Curl usinga book(s) Weigh the books using the weighing scales- you can decide how many you want to use
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