Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 929 · 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: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
3. 3.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
4. 4.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
5. 5.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
6. 6.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
9. 9.Which of these is a pulley? (a) a nut and bolt (b) a seesaw (c) a flagpole rope wheel (d) a knife edge
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
11. 11.⚙️ Which simple machine is a chisel? (a) wheel and axle (b) screw (c) lever (d) wedge
12. 12.🪝 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?
13. 13.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
14. 14.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) metre (m) (d) litre (L)
15. 15.💪 Which force is at work: a compass needle turns? (a) muscular force (b) friction (c) magnetic force (d) gravity
16. 16.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 30 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.💪 Two children push a box to the right, one with 20 N and the other with 30 N. What is the net (total) force on the box, in newtons?
18. 18.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) muscular force (c) gravity (d) friction
19. 19.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
20. 20.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a magnet picks up pins (c) pedalling a cycle (d) lifting a school bag
21. 21.True or false: a fixed pulley stays in one place. (a) True (b) False
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
23. 23.🏋️ Pushing a crate 7 m took 1820 J of work. What force was used, in newtons?
24. 24.True or false: a claw hammer on a nail is a wedge. (a) True (b) False
25. 25.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
26. 26.True or false: an axe blade is an inclined plane. (a) False (b) True
27. 27.💪 In a tug of war, one team pulls right with 65 N and the other pulls left with 50 N. What is the size of the net force, in newtons?
28. 28.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
29. 29.True or false: a tug of war is a pull. (a) True (b) False
30. 30.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (300 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
32. 32.🏋️ A force of 340 N pushes a cart 8 m along the floor. How much work is done, in joules?
33. 33.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
34. 34.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Asha (390 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wheel on ball bearings (d) skating on ice
36. 36.⚖️ A seesaw balances. Meena (240 N) sits ? m from the pivot on one side; Kabir (480 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
37. 37.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: drawing up a well bucket is a pull. (a) True (b) False
40. 40.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed

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