Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 956 · 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 seesaw balances. Arjun (540 N) sits ? m from the pivot on one side; Kabir (720 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
2. 2.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
3. 3.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
4. 4.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
5. 5.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
7. 7.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a ramp wrapped round (d) a bent lever
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
9. 9.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
10. 10.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
11. 11.⚖️ A lever bar balances. The load is 160 N at 50 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 400 N bucket on the axle, in newtons? (ideal)
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.Which of these is an inclined plane? (a) a flagpole rope wheel (b) a door stopper (c) a bottle opener (d) a wheelchair ramp
15. 15.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a tyre with deep treads (d) a grippy rubber sole
17. 17.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
18. 18.True or false: a smooth steel slide gives less friction. (a) False (b) True
19. 19.🏋️ A force of 50 N pushes a cart 3 m along the floor. How much work is done, in joules?
20. 20.⚖️ A seesaw balances. Ravi (420 N) sits 3 m from the pivot on one side; Arjun (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) skating on ice
22. 22.⚖️ A lever bar balances. The load is 120 N at 20 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?
23. 23.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
25. 25.🏋️ A force of 280 N did 280 J of work. How many metres did the object move?
26. 26.Which of these is a screw? (a) a nutcracker (b) a truck loading ramp (c) a nut and bolt (d) a bottle opener
27. 27.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) screw (c) inclined plane (d) lever
28. 28.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
29. 29.True or false: a movable pulley halves the effort. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a jar lid (b) a steering wheel (c) a wood screw (d) a screw jack
31. 31.True or false: a fixed pulley halves the effort. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
33. 33.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
34. 34.True or false: opening a drawer is a push. (a) False (b) True
35. 35.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
36. 36.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
37. 37.💪 Two children push a box to the right, one with 65 N and the other with 40 N. What is the net (total) force on the box, in newtons?
38. 38.Which of these is caused by muscular force? (a) a thrown ball comes down (b) brakes stop a bicycle (c) rubbing hands warms them (d) squeezing a lemon
39. 39.True or false: pulling up your socks is a pull. (a) False (b) True
40. 40.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum

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