Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 487 · 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. Zoya (420 N) sits 4 m from the pivot on one side; Asha (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
3. 3.💪 A force is a … (a) kind of colour (b) unit of time (c) type of sound (d) push or a pull
4. 4.True or false: pulling a cart is a push. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a knife edge (b) a claw hammer on a nail (c) a seesaw (d) a crowbar
6. 6.⚖️ A lever bar balances. The load is 70 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
8. 8.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
9. 9.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
10. 10.Which of these is caused by gravity? (a) rubbing hands warms them (b) pedalling a cycle (c) a river flows downhill (d) lifting a school bag
11. 11.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
12. 12.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
13. 13.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
14. 14.⚙️ Which simple machine is a claw hammer on a nail? (a) screw (b) wedge (c) inclined plane (d) lever
15. 15.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
16. 16.Which of these is a screw? (a) a claw hammer on a nail (b) a jar lid (c) a road up a hill (d) the tip of a nail
17. 17.Which of these is a lever? (a) an axe blade (b) a wheelchair ramp (c) a flagpole rope wheel (d) a nutcracker
18. 18.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
19. 19.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
20. 20.True or false: closing a drawer is a push. (a) False (b) True
21. 21.⚖️ A seesaw balances. Ravi (200 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.True or false: a playground slide is a pulley. (a) False (b) True
23. 23.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
24. 24.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
25. 25.🪝 A load of 140 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.Which of these is caused by magnetic force? (a) a compass needle turns (b) a rolling ball slows (c) a thrown ball comes down (d) brakes stop a bicycle
27. 27.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) a wheel on a rod (d) two ramps back to back
28. 28.True or false: a movable pulley only changes direction. (a) False (b) True
29. 29.💪 A bag has a mass of 51 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
30. 30.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
31. 31.💪 Two children push a box to the right, one with 40 N and the other with 30 N. What is the net (total) force on the box, in newtons?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.⚙️ Which simple machine is a bottle opener? (a) screw (b) pulley (c) lever (d) wedge
34. 34.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
36. 36.True or false: skating on ice gives less friction. (a) False (b) True
37. 37.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
40. 40.True or false: a movable pulley needs effort = load. (a) False (b) True

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