Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 210 · 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 cart is pulled to the right with 60 N and to the left with 75 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
2. 2.🏋️ A force of 110 N did 1100 J of work. How many metres did the object move?
3. 3.True or false: a fixed pulley only changes direction. (a) False (b) True
4. 4.💪 A box weighs 110 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
5. 5.True or false: powder on a carrom board gives less friction. (a) False (b) True
6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a loose rope (d) a flat ramp
7. 7.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.⚙️ Which simple machine is a steering wheel? (a) wheel and axle (b) inclined plane (c) lever (d) wedge
9. 9.⚙️ Which simple machine is a nut and bolt? (a) wheel and axle (b) lever (c) wedge (d) screw
10. 10.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
11. 11.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
12. 12.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the effort (d) the fulcrum
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) lever (c) wedge (d) wheel and axle
16. 16.Which of these is an inclined plane? (a) a knife edge (b) a crowbar (c) a window blind cord (d) a truck loading ramp
17. 17.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) less effort (d) more effort
18. 18.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.⚖️ A lever bar balances. The load is 300 N at 30 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a tyre with deep treads (d) skating on ice
21. 21.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.🏋️ Pushing a crate 6 m took 1320 J of work. What force was used, in newtons?
25. 25.⚖️ A lever bar balances. The load is 180 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 80 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
27. 27.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
28. 28.⚖️ A lever bar balances. The load is 240 N at 50 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.💪 A cart is pulled to the right with 65 N and to the left with 60 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
30. 30.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Kabir (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
33. 33.💪 Which force is at work: shoes grip the floor? (a) gravity (b) magnetic force (c) friction (d) muscular force
34. 34.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
36. 36.⚖️ A seesaw balances. Ravi (110 N) sits 4 m from the pivot on one side; Asha (440 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.⚙️ Which simple machine is a screw jack? (a) wedge (b) pulley (c) lever (d) screw
38. 38.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
39. 39.True or false: a movable pulley is on a flagpole top. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice

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