Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 966 · 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 lever bar balances. The load is 320 N at 20 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?
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
3. 3.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.Which of these is a screw? (a) a well winch handle (b) a truck loading ramp (c) a window blind cord (d) a jar lid
5. 5.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
6. 6.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
7. 7.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
8. 8.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 3750 N box up it, in newtons? (ideal ramp, no friction)
9. 9.True or false: a fixed pulley hangs on the rope loop. (a) False (b) True
10. 10.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) sand on a slippery path (d) a tyre with deep treads
12. 12.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 60 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.Which of these is caused by friction? (a) an apple falls down (b) pedalling a cycle (c) a river flows downhill (d) rubbing hands warms them
14. 14.⚖️ A lever bar balances. The load is 160 N at 50 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
16. 16.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
17. 17.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
18. 18.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
19. 19.Which of these is a lever? (a) a wood screw (b) the tip of a nail (c) a road up a hill (d) a bottle opener
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
21. 21.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a flagpole rope wheel (b) a well-bucket rope wheel (c) a crane hook block (d) a round doorknob
23. 23.⚙️ A wedge is … (a) two ramps back to back (b) a bar on a pivot (c) a wheel on a rod (d) a rope on a wheel
24. 24.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
25. 25.🪝 A pulley system lifts a 690 N load with an effort of 230 N. What is its mechanical advantage (MA)?
26. 26.Which of these is an inclined plane? (a) a screw jack (b) a flagpole rope wheel (c) a playground slide (d) a crane hook block
27. 27.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
28. 28.Which of these is a lever? (a) a wheelchair ramp (b) a crowbar (c) a jar lid (d) a truck loading ramp
29. 29.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the axle (c) the effort (d) the fulcrum
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.⚖️ A lever bar balances. The load is 630 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.Which of these is a wheel and axle? (a) a bottle opener (b) a jar lid (c) a screw jack (d) a water tap handle
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a rough doormat
34. 34.💪 Which force is at work: rubbing hands warms them? (a) friction (b) muscular force (c) gravity (d) magnetic force
35. 35.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
37. 37.🏋️ A force of 180 N pushes a cart 5 m along the floor. How much work is done, in joules?
38. 38.⚙️ Which simple machine is a well-bucket rope wheel? (a) inclined plane (b) wheel and axle (c) wedge (d) pulley
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
40. 40.⚖️ A seesaw balances. Arjun (140 N) sits 1 m from the pivot on one side; Meena (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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