Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 194 · 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: pulling a cart is a pull. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
3. 3.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.True or false: pressing a doorbell is a pull. (a) True (b) False
6. 6.True or false: a movable pulley is on a flagpole top. (a) False (b) True
7. 7.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) two ramps back to back (d) a wheel on a rod
8. 8.True or false: pushing a swing is a pull. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
10. 10.🏋️ Pushing a crate 2 m took 800 J of work. What force was used, in newtons?
11. 11.🔍 Which is the odd one out? (a) a seesaw (b) a door stopper (c) a chisel (d) a knife edge
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) anywhere (d) farther from the pivot
13. 13.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wheel on ball bearings (d) skating on ice
15. 15.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
16. 16.⚖️ A lever bar balances. The load is 540 N at ? cm from the fulcrum. The effort is 180 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) magnetic force (c) friction (d) gravity
18. 18.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the load (d) the effort
19. 19.💪 Which force is at work: squeezing a lemon? (a) gravity (b) magnetic force (c) friction (d) muscular force
20. 20.True or false: a crowbar is a lever. (a) True (b) False
21. 21.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
22. 22.Which of these is a lever? (a) a steering wheel (b) a claw hammer on a nail (c) a jar lid (d) a truck loading ramp
23. 23.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
24. 24.🏋️ Pushing a crate 7 m took 1400 J of work. What force was used, in newtons?
25. 25.True or false: drawing up a well bucket is a push. (a) False (b) True
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) far from the fulcrum (d) on the rock
29. 29.💪 Two children push a box to the right, one with 15 N and the other with 60 N. What is the net (total) force on the box, in newtons?
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a smooth steel slide
31. 31.⚖️ A seesaw balances. Meena (170 N) sits 1 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
33. 33.Which of these is caused by muscular force? (a) rubbing hands warms them (b) lifting a school bag (c) a fridge magnet sticks (d) shoes grip the floor
34. 34.🏋️ A 9 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a ramp wrapped round (d) a bent lever
36. 36.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
37. 37.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
38. 38.🏋️ A force of 480 N pushes a cart 6 m along the floor. How much work is done, in joules?
39. 39.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
40. 40.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) magnetic force (c) muscular force (d) gravity

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