Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 32 · 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.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.⚖️ A seesaw balances. Ravi (480 N) sits ? m from the pivot on one side; Kabir (320 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) skating on ice
5. 5.Which of these is a screw? (a) a crowbar (b) a steering wheel (c) a bottle cap (d) a door stopper
6. 6.True or false: chalk on a gym bar gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.🪝 A pulley system lifts a 200 N load with an effort of 100 N. What is its mechanical advantage (MA)?
9. 9.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
10. 10.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
11. 11.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
12. 12.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 120 N bucket on the axle, in newtons? (ideal)
13. 13.True or false: a fixed pulley stays in one place. (a) False (b) True
14. 14.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.Which of these is an inclined plane? (a) a bottle cap (b) a water tap handle (c) a door stopper (d) a road up a hill
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
19. 19.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the effort (d) the load
21. 21.🏋️ A force of 40 N pushes a cart 2 m along the floor. How much work is done, in joules?
22. 22.⚖️ Which class of lever is a wheelbarrow? (a) class 2 (b) class 3 (c) class 1
23. 23.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
24. 24.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) both weights are equal (d) the bar is short
25. 25.⚙️ Which simple machine is a seesaw? (a) wheel and axle (b) wedge (c) lever (d) screw
26. 26.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
27. 27.Which of these is caused by gravity? (a) a fridge magnet sticks (b) rain falls to the ground (c) a magnet picks up pins (d) a rolling ball slows
28. 28.💪 A bag has a mass of 40 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
29. 29.🏋️ Pushing a crate 8 m took 800 J of work. What force was used, in newtons?
30. 30.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force
33. 33.Which of these is a screw? (a) a claw hammer on a nail (b) a playground slide (c) a well winch handle (d) a wood screw
34. 34.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
35. 35.🏋️ Pushing a crate 6 m took 2640 J of work. What force was used, in newtons?
36. 36.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
37. 37.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
38. 38.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
39. 39.True or false: opening a drawer is a pull. (a) False (b) True
40. 40.🪝 A load of 60 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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