Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 419 · 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.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a wet tiled floor (d) a grippy rubber sole
2. 2.🪝 A pulley system lifts a 510 N load with an effort of 170 N. What is its mechanical advantage (MA)?
3. 3.🏋️ A force of 110 N pushes a cart 10 m along the floor. How much work is done, in joules?
4. 4.💪 In which unit do we measure force? (a) newton (N) (b) metre (m) (c) second (s) (d) litre (L)
5. 5.🏋️ A force of 90 N did 630 J of work. How many metres did the object move?
6. 6.⚖️ A lever balances when … (a) the fulcrum moves (b) turning effects match (c) both weights are equal (d) the bar is short
7. 7.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
8. 8.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) gravity (d) the direction of pull
9. 9.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
12. 12.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
13. 13.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.💪 A cart is pulled to the right with 30 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
16. 16.🏋️ A force of 290 N pushes a cart 4 m along the floor. How much work is done, in joules?
17. 17.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 60 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) start it moving (d) stop it moving
19. 19.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.🏋️ A machine lifts a load of 210 N when you push with 70 N. What is its mechanical advantage (MA)?
21. 21.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the axle
23. 23.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 35 N. What is the size of the net force, in newtons?
24. 24.Which of these is caused by muscular force? (a) shoes grip the floor (b) squeezing a lemon (c) rain falls to the ground (d) an apple falls down
25. 25.Which of these is a lever? (a) a round doorknob (b) a well winch handle (c) a seesaw (d) a window blind cord
26. 26.⚖️ A seesaw balances. Ravi (540 N) sits ? m from the pivot on one side; Asha (360 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
28. 28.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.🏋️ An 18 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.🏋️ A force of 380 N pushes a cart 2 m along the floor. How much work is done, in joules?
32. 32.🔍 Which is the odd one out? (a) a steering wheel (b) a well winch handle (c) a window blind cord (d) a water tap handle
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
35. 35.⚖️ A seesaw balances. Kabir (760 N) sits 2 m from the pivot on one side; Meena (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.True or false: a bottle opener is a class 2 lever (load in the middle). (a) False (b) True
37. 37.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
40. 40.True or false: kicking a football is a push. (a) True (b) False

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