Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 85 · 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.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
2. 2.💪 Two children push a box to the right, one with 85 N and the other with 5 N. What is the net (total) force on the box, in newtons?
3. 3.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a loose rope (c) a smaller rod (axle) (d) a flat ramp
5. 5.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
6. 6.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
7. 7.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a truck loading ramp (d) a nutcracker
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, a carpet 15 N. How many newtons more were needed on a carpet than on ice?
9. 9.🪝 A pulley system lifts a 200 N load with an effort of 100 N. What is its mechanical advantage (MA)?
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) friction (d) gravity
12. 12.True or false: pushing a trolley is a push. (a) False (b) True
13. 13.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
14. 14.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) stop all friction (d) make new energy
15. 15.💪 A cart is pulled to the right with 65 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🏋️ Pushing a crate 9 m took 4140 J of work. What force was used, in newtons?
19. 19.💪 A cart is pulled to the right with 45 N and to the left with 55 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🏋️ A force of 120 N pushes a cart 8 m along the floor. How much work is done, in joules?
22. 22.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
23. 23.⚖️ A lever bar balances. The load is 60 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🔍 Which is the odd one out? (a) a steering wheel (b) a jar lid (c) a wood screw (d) a screw jack
25. 25.Which of these is a pulley? (a) a well-bucket rope wheel (b) a crowbar (c) a seesaw (d) a jar lid
26. 26.Which of these is caused by muscular force? (a) a thrown ball comes down (b) lifting a school bag (c) a rolling ball slows (d) a magnet picks up pins
27. 27.Which of these is a pulley? (a) a well winch handle (b) a wood screw (c) a crowbar (d) a window blind cord
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
29. 29.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
31. 31.💪 Is kicking a football a push or a pull? (a) a push (b) a pull
32. 32.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
36. 36.🏋️ Pushing a crate 5 m took 100 J of work. What force was used, in newtons?
37. 37.True or false: a road up a hill is a wedge. (a) True (b) False
38. 38.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
39. 39.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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