Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 483 · 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 force is at work: squeezing a lemon? (a) magnetic force (b) muscular force (c) friction (d) gravity
2. 2.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
3. 3.Which of these is an inclined plane? (a) a wood screw (b) the tip of a nail (c) a playground slide (d) a bottle opener
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.💪 A box weighs 60 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.⚖️ A lever bar balances. The load is 140 N at 30 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
9. 9.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
10. 10.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) start it moving (d) stop it moving
11. 11.🏋️ A force of 110 N pushes a cart 5 m along the floor. How much work is done, in joules?
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
14. 14.🏋️ A 20 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
16. 16.True or false: a nut and bolt is an inclined plane. (a) False (b) True
17. 17.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.🔍 Which is the odd one out? (a) an axe blade (b) the tip of a nail (c) a knife edge (d) a round doorknob
21. 21.Which of these is a screw? (a) a truck loading ramp (b) a jar lid (c) a claw hammer on a nail (d) a well-bucket rope wheel
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the axle (c) the load (d) the effort
23. 23.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
24. 24.Which of these is a lever? (a) a window blind cord (b) a crane hook block (c) a nut and bolt (d) a bottle opener
25. 25.⚙️ Which simple machine is a truck loading ramp? (a) screw (b) inclined plane (c) lever (d) wedge
26. 26.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.⚖️ A lever bar balances. The load is 160 N at 50 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
29. 29.True or false: a bottle opener is a class 3 lever (effort in the middle). (a) False (b) True
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
31. 31.💪 Two children push a box to the right, one with 85 N and the other with 25 N. What is the net (total) force on the box, in newtons?
32. 32.🏋️ A machine lifts a load of 400 N when you push with 200 N. What is its mechanical advantage (MA)?
33. 33.💪 A bag has a mass of 7 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
34. 34.True or false: sand on a slippery path gives less friction. (a) True (b) False
35. 35.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
36. 36.🪝 A pulley system lifts an 80 N load with an effort of 40 N. What is its mechanical advantage (MA)?
37. 37.🔍 Which is the odd one out? (a) a bottle opener (b) a steering wheel (c) a round doorknob (d) a well winch handle
38. 38.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.🔍 Which is the odd one out? (a) a well winch handle (b) a water tap handle (c) a screw jack (d) a round doorknob
40. 40.🏋️ A force of 120 N did 1200 J of work. How many metres did the object move?

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