Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 701 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.True or false: closing a drawer is a pull. (a) True (b) False
2. 2.🏋️ Pushing a crate 5 m took 1950 J of work. What force was used, in newtons?
3. 3.🏋️ A force of 20 N pushes a cart 10 m along the floor. How much work is done, in joules?
4. 4.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 180 N bucket on the axle, in newtons? (ideal)
5. 5.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
6. 6.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
8. 8.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
10. 10.True or false: a steering wheel is a pulley. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
12. 12.True or false: a claw hammer on a nail is a wheel and axle. (a) False (b) True
13. 13.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
14. 14.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
15. 15.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
16. 16.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1500 N box up it, in newtons? (ideal ramp, no friction)
19. 19.True or false: a wet tiled floor gives more friction. (a) True (b) False
20. 20.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
21. 21.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
23. 23.True or false: a door stopper is a wedge. (a) False (b) True
24. 24.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) wedge (c) pulley (d) lever
25. 25.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
27. 27.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
28. 28.💪 Which force is at work: squeezing a lemon? (a) friction (b) gravity (c) muscular force (d) magnetic force
29. 29.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
30. 30.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.Which of these is a wedge? (a) a seesaw (b) a truck loading ramp (c) a knife edge (d) a wood screw
32. 32.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.🪝 A pulley system lifts a 570 N load with an effort of 190 N. What is its mechanical advantage (MA)?
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
35. 35.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
36. 36.⚖️ A seesaw balances. Zoya (450 N) sits 4 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 55 N. What is the size of the net force, in newtons?
38. 38.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
39. 39.💪 A cart is pulled to the right with 90 N and to the left with 95 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
40. 40.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) False (b) True

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