Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 244 · 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 seesaw balances. Arjun (480 N) sits 1 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Which force is at work: lifting a school bag? (a) gravity (b) magnetic force (c) friction (d) muscular force
3. 3.⚖️ A seesaw balances. Zoya (240 N) sits 1 m from the pivot on one side; Arjun (120 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.True or false: sand on a slippery path gives less friction. (a) False (b) True
5. 5.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
6. 6.Which of these is a screw? (a) a door stopper (b) a water tap handle (c) a truck loading ramp (d) a jar lid
7. 7.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 140 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.True or false: pushing a swing is a push. (a) True (b) False
9. 9.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
10. 10.True or false: a playground slide is a wedge. (a) False (b) True
11. 11.🪝 A load of 520 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a crane hook block (c) a flagpole rope wheel (d) a well-bucket rope wheel
13. 13.🏋️ Pushing a crate 8 m took 640 J of work. What force was used, in newtons?
14. 14.True or false: a truck loading ramp is a lever. (a) False (b) True
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
17. 17.True or false: a fixed pulley needs effort = load. (a) True (b) False
18. 18.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
19. 19.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
21. 21.Which of these is a wheel and axle? (a) a wood screw (b) a claw hammer on a nail (c) an axe blade (d) a round doorknob
22. 22.💪 In a tug of war, one team pulls left with 65 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
23. 23.🔍 Which is the odd one out? (a) an axe blade (b) a round doorknob (c) a well winch handle (d) a steering wheel
24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
25. 25.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
26. 26.🪝 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)
27. 27.⚖️ A lever bar balances. The load is 120 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?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N. How many newtons more were needed on a carpet than on ice?
29. 29.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
30. 30.🏋️ A force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
31. 31.True or false: a fixed pulley only changes direction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a playground slide is a wheel and axle. (a) True (b) False
34. 34.⚖️ 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
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) sand on a slippery path
36. 36.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
37. 37.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
38. 38.🏋️ A force of 20 N did 180 J of work. How many metres did the object move?
39. 39.⚖️ A seesaw balances. Ravi (140 N) sits 1 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.💪 Two children push a box to the right, one with 30 N and the other with 90 N. What is the net (total) force on the box, in newtons?

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