Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 782 · 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.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.True or false: a claw hammer on a nail is a lever. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
5. 5.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
6. 6.⚙️ Which simple machine is a chisel? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
7. 7.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) gravity (d) muscular force
8. 8.🪝 A load of 240 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
10. 10.Which of these is a wedge? (a) a crane hook block (b) a nutcracker (c) a knife edge (d) a bottle cap
11. 11.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.True or false: opening a drawer is a pull. (a) False (b) True
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
15. 15.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
16. 16.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
17. 17.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) friction (c) gravity (d) muscular force
18. 18.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
20. 20.Which of these is a wheel and axle? (a) an axe blade (b) a steering wheel (c) a chisel (d) a wood screw
21. 21.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
22. 22.True or false: pushing a swing is a pull. (a) False (b) True
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
24. 24.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
25. 25.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
27. 27.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
28. 28.💪 Two children push a box to the right, one with 50 N and the other with 25 N. What is the net (total) force on the box, in newtons?
29. 29.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
30. 30.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 80 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.⚖️ A lever bar balances. The load is 90 N at ? cm from the fulcrum. The effort is 150 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
33. 33.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
34. 34.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) inclined plane (c) lever (d) pulley
35. 35.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) near the fulcrum (c) far from the fulcrum (d) on the fulcrum
36. 36.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
37. 37.True or false: a water tap handle is a wheel and axle. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) oil on a squeaky hinge
39. 39.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
40. 40.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load ÷ effort (c) load × effort (d) effort ÷ load

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