Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 571 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
2. 2.💪 Two children push a box to the right, one with 75 N and the other with 50 N. What is the net (total) force on the box, in newtons?
3. 3.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 400 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
5. 5.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
7. 7.🔍 Which is the odd one out? (a) a nut and bolt (b) a flagpole rope wheel (c) a jar lid (d) a wood screw
8. 8.🔍 Which is the odd one out? (a) a round doorknob (b) a steering wheel (c) a door stopper (d) a water tap handle
9. 9.💪 A force is a … (a) push or a pull (b) type of sound (c) kind of colour (d) unit of time
10. 10.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
11. 11.🔍 Which is the odd one out? (a) a round doorknob (b) a jar lid (c) a steering wheel (d) a well winch handle
12. 12.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
13. 13.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
14. 14.⚖️ A lever bar balances. The load is 400 N at 10 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
16. 16.🏋️ A 14 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
17. 17.Which of these is caused by gravity? (a) rain falls to the ground (b) a fridge magnet sticks (c) pedalling a cycle (d) shoes grip the floor
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) skating on ice (d) sand on a slippery path
19. 19.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
20. 20.True or false: closing a drawer is a push. (a) False (b) True
21. 21.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
22. 22.True or false: a door stopper is an inclined plane. (a) False (b) True
23. 23.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) friction (c) magnetic force (d) gravity
24. 24.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) farther from the pivot (d) anywhere
25. 25.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
26. 26.Which of these is a lever? (a) a seesaw (b) a knife edge (c) a window blind cord (d) a bottle cap
27. 27.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
28. 28.🔍 Which is the odd one out? (a) a crowbar (b) a well winch handle (c) a nutcracker (d) a bottle opener
29. 29.🔍 Which is the odd one out? (a) a truck loading ramp (b) a playground slide (c) a wheelchair ramp (d) a nut and bolt
30. 30.⚖️ A lever bar balances. The load is 200 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
31. 31.True or false: closing a drawer is a pull. (a) False (b) True
32. 32.True or false: a grippy rubber sole gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
35. 35.🏋️ Pushing a crate 9 m took 1440 J of work. What force was used, in newtons?
36. 36.🏋️ A force of 240 N pushes a cart 8 m along the floor. How much work is done, in joules?
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the effort (d) the fulcrum
38. 38.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
39. 39.🏋️ A force of 100 N pushes a cart 6 m along the floor. How much work is done, in joules?
40. 40.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2

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