Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 523 · 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.💪 Which force pulls everything towards the Earth? (a) gravity (b) wind (c) magnetism (d) friction
2. 2.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
3. 3.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.⚙️ Which simple machine is a claw hammer on a nail? (a) lever (b) wedge (c) wheel and axle (d) screw
5. 5.Which of these is caused by muscular force? (a) a compass needle turns (b) an apple falls down (c) a rolling ball slows (d) lifting a school bag
6. 6.True or false: a movable pulley needs effort = load. (a) False (b) True
7. 7.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
8. 8.True or false: a crane hook block is a pulley. (a) False (b) True
9. 9.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
10. 10.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 14 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a smooth steel slide (d) a grippy rubber sole
13. 13.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
14. 14.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
15. 15.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
16. 16.🪝 More rope sections holding a load means … (a) less effort needed (b) more effort needed (c) the load floats (d) no change
17. 17.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
18. 18.💪 Two children push a box to the right, one with 70 N and the other with 20 N. What is the net (total) force on the box, in newtons?
19. 19.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
20. 20.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
22. 22.True or false: pushing a swing is a push. (a) False (b) True
23. 23.🏋️ A force of 170 N pushes a cart 4 m along the floor. How much work is done, in joules?
24. 24.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
25. 25.🏋️ Pushing a crate 5 m took 850 J of work. What force was used, in newtons?
26. 26.⚖️ A lever bar balances. The load is 500 N at 10 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?
27. 27.Which of these is a screw? (a) a water tap handle (b) a crowbar (c) a bottle cap (d) a door stopper
28. 28.⚙️ Which simple machine is an axe blade? (a) wedge (b) pulley (c) lever (d) wheel and axle
29. 29.💪 In a tug of war, one team pulls right with 10 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
30. 30.Which of these is caused by gravity? (a) an apple falls down (b) a rolling ball slows (c) a fridge magnet sticks (d) squeezing a lemon
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a smooth steel slide (d) a wheel on ball bearings
32. 32.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 90 N. What is the size of the net force, in newtons?
33. 33.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
34. 34.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
35. 35.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
37. 37.🔍 Which is the odd one out? (a) a crowbar (b) a seesaw (c) a nutcracker (d) a jar lid
38. 38.⚖️ A seesaw balances. Kabir (510 N) sits ? m from the pivot on one side; Arjun (510 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
39. 39.🏋️ Pushing a crate 6 m took 600 J of work. What force was used, in newtons?
40. 40.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short

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