Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 787 · 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 pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
2. 2.🏋️ A force of 140 N pushes a cart 5 m along the floor. How much work is done, in joules?
3. 3.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
4. 4.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a tyre with deep treads (d) sand on a slippery path
6. 6.⚙️ Which simple machine is a window blind cord? (a) inclined plane (b) screw (c) pulley (d) wedge
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.Which of these is a screw? (a) a steering wheel (b) a truck loading ramp (c) a knife edge (d) a bottle cap
9. 9.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
11. 11.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
12. 12.⚖️ A seesaw balances. Zoya (440 N) sits 2 m from the pivot on one side; Meena (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
15. 15.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) muscular force (c) friction (d) gravity
16. 16.🏋️ A force of 10 N pushes a cart 8 m along the floor. How much work is done, in joules?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
18. 18.🏋️ A force of 170 N did 1360 J of work. How many metres did the object move?
19. 19.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
20. 20.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
21. 21.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 120 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
24. 24.🔍 Which is the odd one out? (a) a crane hook block (b) a bottle opener (c) a flagpole rope wheel (d) a window blind cord
25. 25.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
26. 26.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2550 N box up it, in newtons? (ideal ramp, no friction)
27. 27.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) gravity (c) magnetic force (d) muscular force
29. 29.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
30. 30.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a bar on a pivot (d) a wheel on a rod
31. 31.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
33. 33.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
34. 34.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
35. 35.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
36. 36.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 10 N. What is the size of the net force, in newtons?
37. 37.True or false: pulling up your socks is a push. (a) False (b) True
38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
39. 39.Which of these is a wheel and axle? (a) a jar lid (b) a wheelchair ramp (c) a seesaw (d) a well winch handle
40. 40.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push

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