Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 51 · 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.True or false: a grippy rubber sole gives more friction. (a) False (b) True
2. 2.True or false: a movable pulley needs effort = load. (a) False (b) True
3. 3.🏋️ A force of 270 N pushes a cart 3 m along the floor. How much work is done, in joules?
4. 4.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a crane hook block (d) a nutcracker
5. 5.🏋️ A force of 110 N pushes a cart 2 m along the floor. How much work is done, in joules?
6. 6.⚖️ A seesaw balances. Meena (280 N) sits 1 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 70 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
8. 8.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
9. 9.⚖️ A lever bar balances. The load is 240 N at 10 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.💪 A bag has a mass of 40 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
11. 11.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) switch off gravity (c) stop all friction (d) use a smaller force
12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a smaller rod (axle) (c) a flat ramp (d) a loose rope
13. 13.Which of these is an inclined plane? (a) a well-bucket rope wheel (b) a knife edge (c) a bottle opener (d) a road up a hill
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a tyre with deep treads
15. 15.💪 Two children push a box to the right, one with 40 N and the other with 60 N. What is the net (total) force on the box, in newtons?
16. 16.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
17. 17.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
18. 18.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
19. 19.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
21. 21.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.True or false: skating on ice gives less friction. (a) True (b) False
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
24. 24.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a fridge magnet sticks (c) a thrown ball comes down (d) lifting a school bag
25. 25.⚖️ A seesaw balances. Ravi (380 N) sits 4 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.True or false: powder on a carrom board gives more friction. (a) False (b) True
27. 27.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
28. 28.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
29. 29.🏋️ A force of 440 N pushes a cart 2 m along the floor. How much work is done, in joules?
30. 30.True or false: a jar lid is an inclined plane. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
33. 33.⚖️ A seesaw balances. Arjun (520 N) sits ? m from the pivot on one side; Kabir (390 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
35. 35.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
37. 37.🏋️ A machine lifts a load of 200 N when you push with 50 N. What is its mechanical advantage (MA)?
38. 38.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
39. 39.⚙️ Which simple machine is a wood screw? (a) screw (b) wheel and axle (c) wedge (d) lever
40. 40.⚙️ Which simple machine is a window blind cord? (a) inclined plane (b) wedge (c) lever (d) pulley

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