Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 128 · 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.🪝 A load of 560 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
2. 2.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
5. 5.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a bottle cap (c) a jar lid (d) a wood screw
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
7. 7.💪 Which force is at work: shoes grip the floor? (a) friction (b) magnetic force (c) muscular force (d) gravity
8. 8.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
9. 9.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
10. 10.⚖️ A lever bar balances. The load is 280 N at 40 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?
11. 11.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) a river flows downhill (d) pedalling a cycle
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) the load floats (d) no change
14. 14.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a bottle opener (c) a truck loading ramp (d) a seesaw
15. 15.🪝 A winch has a wheel of radius 12 cm and an axle of radius 4 cm. What effort on the wheel lifts a 450 N bucket on the axle, in newtons? (ideal)
16. 16.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
17. 17.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) near the fulcrum (d) far from the fulcrum
18. 18.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) metre (m) (d) newton (N)
19. 19.True or false: a wet tiled floor gives more friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
21. 21.True or false: a movable pulley stays in one place. (a) True (b) False
22. 22.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
23. 23.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
24. 24.⚙️ Which simple machine is a seesaw? (a) screw (b) wedge (c) wheel and axle (d) lever
25. 25.🪝 A pulley system lifts a 960 N load with an effort of 240 N. What is its mechanical advantage (MA)?
26. 26.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) True (b) False
29. 29.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the direction of pull (d) the size of the load
30. 30.🏋️ A 3 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a playground slide (c) a well-bucket rope wheel (d) a window blind cord
32. 32.True or false: plucking a mango is a push. (a) False (b) True
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) friction (d) muscular force
35. 35.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Kabir (280 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a wet tiled floor (d) powder on a carrom board
37. 37.💪 A cart is pulled to the right with 30 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
38. 38.⚙️ Which simple machine is a bottle cap? (a) pulley (b) wedge (c) lever (d) screw
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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