Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 38 · 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.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
2. 2.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) a bar on a pivot (d) two ramps back to back
3. 3.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a flat ramp (d) a sharp wedge
5. 5.🏋️ A force of 30 N pushes a cart 3 m along the floor. How much work is done, in joules?
6. 6.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a smooth steel slide (d) a box pushed on carpet
8. 8.🏋️ Pushing a crate 4 m took 1520 J of work. What force was used, in newtons?
9. 9.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
10. 10.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
13. 13.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
14. 14.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
15. 15.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
16. 16.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Meena (260 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.🏋️ A force of 230 N did 920 J of work. How many metres did the object move?
18. 18.True or false: skating on ice gives more friction. (a) False (b) True
19. 19.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) load × effort (c) load ÷ effort (d) effort ÷ load
20. 20.⚖️ A lever bar balances. The load is 80 N at 20 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.Which of these is a lever? (a) a nutcracker (b) a well winch handle (c) a knife edge (d) a water tap handle
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.Which of these is a wedge? (a) a bottle opener (b) a nutcracker (c) an axe blade (d) a flagpole rope wheel
24. 24.💪 Which force is at work: a fridge magnet sticks? (a) friction (b) muscular force (c) gravity (d) magnetic force
25. 25.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 110 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.⚖️ A seesaw balances. Arjun (? N) sits 4 m from the pivot on one side; Zoya (760 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🏋️ Pushing a crate 7 m took 2380 J of work. What force was used, in newtons?
29. 29.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) friction (d) magnetic force
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
31. 31.💪 Which force is at work: pedalling a cycle? (a) friction (b) muscular force (c) magnetic force (d) gravity
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a tyre with deep treads (d) a grippy rubber sole
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
34. 34.Which of these is a lever? (a) a window blind cord (b) a screw jack (c) a flagpole rope wheel (d) a bottle opener
35. 35.True or false: an axe blade is a wedge. (a) False (b) True
36. 36.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
38. 38.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.True or false: a fixed pulley is on a flagpole top. (a) True (b) False

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