Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 602 · 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.⚖️ 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
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
4. 4.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
5. 5.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
6. 6.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
7. 7.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) litre (L) (d) metre (m)
8. 8.🔍 Which is the odd one out? (a) a nut and bolt (b) a bottle cap (c) a jar lid (d) a nutcracker
9. 9.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
10. 10.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
11. 11.Which of these is a lever? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a nutcracker (d) a door stopper
12. 12.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.True or false: a rough doormat gives less friction. (a) False (b) True
15. 15.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
16. 16.🏋️ A force of 60 N did 600 J of work. How many metres did the object move?
17. 17.True or false: a crowbar is a class 2 lever (load in the middle). (a) False (b) True
18. 18.⚖️ A lever bar balances. The load is 60 N at 30 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 180 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
22. 22.⚖️ A seesaw balances. Ravi (240 N) sits 3 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
23. 23.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
24. 24.💪 Which force is at work: a magnet picks up pins? (a) friction (b) magnetic force (c) gravity (d) muscular force
25. 25.💪 Which force is at work: squeezing a lemon? (a) muscular force (b) magnetic force (c) gravity (d) friction
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) a wheel on ball bearings
27. 27.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
28. 28.⚙️ Which simple machine is a door stopper? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
29. 29.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) closer to the pivot (d) farther from the pivot
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.Which of these is a wedge? (a) a flagpole rope wheel (b) a playground slide (c) a knife edge (d) a crowbar
32. 32.🏋️ A force of 380 N pushes a cart 4 m along the floor. How much work is done, in joules?
33. 33.🏋️ A force of 500 N pushes a cart 2 m along the floor. How much work is done, in joules?
34. 34.🏋️ A force of 300 N pushes a cart 1 m along the floor. How much work is done, in joules?
35. 35.🏋️ Pushing a crate 7 m took 1050 J of work. What force was used, in newtons?
36. 36.💪 Two children push a box to the right, one with 85 N and the other with 30 N. What is the net (total) force on the box, in newtons?
37. 37.💪 A cart is pulled to the right with 35 N and to the left with 30 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
38. 38.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?

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