Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 145 · 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.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) on the fulcrum (d) near the fulcrum
2. 2.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
3. 3.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the effort (c) the axle (d) the fulcrum
4. 4.🏋️ Pushing a crate 8 m took 400 J of work. What force was used, in newtons?
5. 5.🏋️ A 2 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) farther from the pivot (c) closer to the pivot (d) on the pivot
7. 7.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
8. 8.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
9. 9.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 6 (d) 10
10. 10.Which of these is a pulley? (a) a road up a hill (b) a knife edge (c) a crowbar (d) a flagpole rope wheel
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a seesaw (d) a bottle cap
13. 13.💪 A cart is pulled to the right with 70 N and to the left with 65 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 13 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
15. 15.True or false: a rough doormat gives more friction. (a) False (b) True
16. 16.⚖️ A lever bar balances. The load is 160 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
18. 18.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 340 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
20. 20.Which of these is caused by gravity? (a) shoes grip the floor (b) a magnet picks up pins (c) rain falls to the ground (d) a fridge magnet sticks
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
22. 22.Which of these is caused by magnetic force? (a) a river flows downhill (b) an apple falls down (c) pedalling a cycle (d) a compass needle turns
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.🏋️ A force of 80 N pushes a cart 10 m along the floor. How much work is done, in joules?
27. 27.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
28. 28.True or false: opening a drawer is a push. (a) False (b) True
29. 29.⚖️ A lever bar balances. The load is 900 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the fulcrum (d) the effort
32. 32.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
33. 33.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
34. 34.💪 In a tug of war, one team pulls left with 75 N and the other pulls right with 60 N. What is the size of the net force, in newtons?
35. 35.🏋️ A force of 140 N pushes a cart 10 m along the floor. How much work is done, in joules?
36. 36.💪 Two children push a box to the right, one with 15 N and the other with 50 N. What is the net (total) force on the box, in newtons?
37. 37.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
38. 38.Which of these is an inclined plane? (a) a road up a hill (b) a bottle cap (c) the tip of a nail (d) an axe blade
39. 39.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
40. 40.⚖️ A seesaw balances. Kabir (280 N) sits 3 m from the pivot on one side; Zoya (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?

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