Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 37 · 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 bag has a mass of 45 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) the load (c) nothing (d) the fulcrum
3. 3.Which of these is caused by gravity? (a) pedalling a cycle (b) shoes grip the floor (c) brakes stop a bicycle (d) a river flows downhill
4. 4.⚖️ A lever bar balances. The load is 420 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?
5. 5.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (240 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
7. 7.💪 Two children push a box to the right, one with 80 N and the other with 25 N. What is the net (total) force on the box, in newtons?
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) chalk on a gym bar (d) a grippy rubber sole
10. 10.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
11. 11.Which of these is a lever? (a) a wood screw (b) a knife edge (c) a flagpole rope wheel (d) a claw hammer on a nail
12. 12.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a smooth steel slide (d) skating on ice
14. 14.💪 Two children push a box to the right, one with 100 N and the other with 60 N. What is the net (total) force on the box, in newtons?
15. 15.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
16. 16.🪝 A pulley system lifts a 440 N load with an effort of 220 N. What is its mechanical advantage (MA)?
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
19. 19.💪 A box weighs 170 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
21. 21.🪝 A pulley system lifts a 90 N load with an effort of 30 N. What is its mechanical advantage (MA)?
22. 22.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
23. 23.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
25. 25.True or false: plucking a mango is a pull. (a) True (b) False
26. 26.🏋️ Pushing a crate 2 m took 520 J of work. What force was used, in newtons?
27. 27.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
28. 28.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.🏋️ A 13 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ A seesaw balances. Kabir (640 N) sits 2 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
32. 32.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) pedalling a cycle (d) brakes stop a bicycle
33. 33.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
34. 34.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 10 (d) 3
35. 35.🏋️ A force of 330 N pushes a cart 4 m along the floor. How much work is done, in joules?
36. 36.🏋️ A force of 80 N pushes a cart 6 m along the floor. How much work is done, in joules?
37. 37.🪝 A winch has a wheel of radius 20 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
38. 38.Which of these is a screw? (a) a water tap handle (b) a screw jack (c) a claw hammer on a nail (d) a well winch handle
39. 39.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
40. 40.🏋️ A force of 380 N pushes a cart 9 m along the floor. How much work is done, in joules?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids