Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 348 · 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 simple machine is a nut and bolt? (a) lever (b) wheel and axle (c) inclined plane (d) screw
2. 2.Which of these is caused by friction? (a) lifting a school bag (b) rain falls to the ground (c) a rolling ball slows (d) a compass needle turns
3. 3.🪝 A load of 400 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) the load floats (d) less effort needed
5. 5.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope
6. 6.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the axle
7. 7.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.🏋️ Pushing a crate 5 m took 600 J of work. What force was used, in newtons?
12. 12.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚖️ A seesaw balances. Asha (380 N) sits 2 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
15. 15.⚙️ Which simple machine is a crane hook block? (a) pulley (b) screw (c) inclined plane (d) wedge
16. 16.Which of these is caused by muscular force? (a) a river flows downhill (b) pedalling a cycle (c) a thrown ball comes down (d) a rolling ball slows
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
18. 18.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Zoya (200 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 390 N bucket on the axle, in newtons? (ideal)
20. 20.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
21. 21.Which of these is a lever? (a) a nut and bolt (b) a crowbar (c) a water tap handle (d) a wheelchair ramp
22. 22.💪 Two children push a box to the right, one with 80 N and the other with 35 N. What is the net (total) force on the box, in newtons?
23. 23.🏋️ A force of 290 N did 2610 J of work. How many metres did the object move?
24. 24.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
25. 25.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) gravity (c) unbalanced (d) doubled
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a wet tiled floor (d) a rough doormat
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🏋️ A force of 340 N did 1020 J of work. How many metres did the object move?
29. 29.🏋️ A force of 30 N pushes a cart 1 m along the floor. How much work is done, in joules?
30. 30.True or false: opening a drawer is a push. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a bottle opener (d) a window blind cord
32. 32.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
34. 34.🛞 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 8 N. How many newtons more were needed on a carpet than on ice?
35. 35.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
37. 37.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
39. 39.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a fridge magnet sticks (c) rubbing hands warms them (d) squeezing a lemon
40. 40.🪝 A bucket weighing 430 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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