Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 92 · 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.💪 Two children push a box to the right, one with 50 N and the other with 20 N. What is the net (total) force on the box, in newtons?
2. 2.💪 A bag has a mass of 22 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
4. 4.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
5. 5.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
6. 6.⚖️ A lever bar balances. The load is 60 N at 50 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
9. 9.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
12. 12.🪝 A load of 280 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚖️ A seesaw balances. Ravi (190 N) sits ? m from the pivot on one side; Zoya (190 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the axle (d) the load
16. 16.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
17. 17.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
18. 18.⚙️ Which simple machine is a bottle opener? (a) screw (b) wheel and axle (c) pulley (d) lever
19. 19.🏋️ Pushing a crate 10 m took 2500 J of work. What force was used, in newtons?
20. 20.True or false: a fixed pulley rises with the load. (a) True (b) False
21. 21.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.💪 A cart is pulled to the right with 60 N and to the left with 50 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
23. 23.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
24. 24.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) wind (d) magnetism
25. 25.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
26. 26.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
27. 27.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
28. 28.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
29. 29.⚖️ A lever bar balances. The load is 60 N at 40 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
31. 31.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
32. 32.⚖️ A seesaw balances. Asha (570 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
35. 35.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a tyre with deep treads
37. 37.🏋️ Pushing a crate 7 m took 1190 J of work. What force was used, in newtons?
38. 38.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
39. 39.🏋️ A force of 10 N pushes a cart 9 m along the floor. How much work is done, in joules?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice

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