Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 3 · 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) friction (b) magnetism (c) wind (d) gravity
2. 2.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
4. 4.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
5. 5.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) more effort (d) no effort
6. 6.🏋️ Pushing a crate 10 m took 1300 J of work. What force was used, in newtons?
7. 7.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
8. 8.True or false: a fixed pulley halves the effort. (a) False (b) True
9. 9.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
10. 10.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
11. 11.True or false: kicking a football is a push. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
13. 13.🪝 A load of 360 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
15. 15.⚖️ A seesaw balances. Meena (240 N) sits 2 m from the pivot on one side; Zoya (240 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
16. 16.⚙️ Which simple machine is a well winch handle? (a) inclined plane (b) wedge (c) wheel and axle (d) lever
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
18. 18.💪 Which can a force NOT do? (a) stop it moving (b) change its shape (c) change its colour (d) start it moving
19. 19.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
20. 20.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
21. 21.💪 A cart is pulled to the right with 55 N and to the left with 45 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
22. 22.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
23. 23.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
24. 24.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
25. 25.🏋️ A force of 440 N pushes a cart 8 m along the floor. How much work is done, in joules?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
28. 28.🔍 Which is the odd one out? (a) a knife edge (b) the tip of a nail (c) an axe blade (d) a nut and bolt
29. 29.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
30. 30.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
31. 31.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
32. 32.True or false: sand on a slippery path gives more friction. (a) False (b) True
33. 33.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Ravi (600 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) True (b) False
35. 35.⚙️ Which simple machine is a steering wheel? (a) wedge (b) lever (c) screw (d) wheel and axle
36. 36.💪 Which force is at work: a fridge magnet sticks? (a) magnetic force (b) muscular force (c) gravity (d) friction
37. 37.True or false: drawing up a well bucket is a pull. (a) True (b) False
38. 38.💪 A box weighs 250 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
39. 39.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
40. 40.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?

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