Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 484 · 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: a nut and bolt is a screw. (a) False (b) True
2. 2.Which of these is an inclined plane? (a) a nut and bolt (b) a flagpole rope wheel (c) a truck loading ramp (d) a window blind cord
3. 3.💪 Which force is at work: rubbing hands warms them? (a) friction (b) muscular force (c) magnetic force (d) gravity
4. 4.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
5. 5.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) True (b) False
7. 7.True or false: closing a drawer is a push. (a) True (b) False
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
9. 9.🪝 A load of 180 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
10. 10.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
11. 11.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.True or false: a box pushed on carpet gives more friction. (a) False (b) True
14. 14.True or false: a box pushed on carpet gives less friction. (a) False (b) True
15. 15.Which of these is caused by magnetic force? (a) a river flows downhill (b) shoes grip the floor (c) an apple falls down (d) a compass needle turns
16. 16.🏋️ Can a simple machine reduce the work done? (a) yes, by half (b) yes, always (c) only on Mondays (d) no, work stays the same
17. 17.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
18. 18.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a kind of wheel (d) a ramp wrapped round
19. 19.⚖️ A seesaw balances. Ravi (390 N) sits 2 m from the pivot on one side; Arjun (260 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
20. 20.⚖️ A seesaw balances. Ravi (760 N) sits 3 m from the pivot on one side; Asha (570 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) gravity (d) wind
22. 22.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.Which of these is an inclined plane? (a) a water tap handle (b) a nutcracker (c) a well-bucket rope wheel (d) a road up a hill
24. 24.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
26. 26.💪 A bag has a mass of 56 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Zoya (140 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🏋️ A force of 500 N did 3000 J of work. How many metres did the object move?
29. 29.⚙️ Which simple machine is a wood screw? (a) pulley (b) lever (c) screw (d) wedge
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) newton (N) (d) second (s)
32. 32.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 320 N bucket on the axle, in newtons? (ideal)
33. 33.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
35. 35.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force
36. 36.🏋️ Pushing a crate 9 m took 1710 J of work. What force was used, in newtons?
37. 37.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
38. 38.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the fulcrum (c) near the fulcrum (d) on the rock

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