Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 316 · 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 simple machine is a screw jack? (a) lever (b) wheel and axle (c) screw (d) pulley
2. 2.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a door stopper (d) a crowbar
3. 3.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
4. 4.⚙️ Which simple machine is a nutcracker? (a) wedge (b) wheel and axle (c) lever (d) screw
5. 5.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
10. 10.⚙️ A wedge is … (a) a wheel on a rod (b) a rope on a wheel (c) two ramps back to back (d) a bar on a pivot
11. 11.🏋️ A force of 160 N pushes a cart 5 m along the floor. How much work is done, in joules?
12. 12.⚙️ Which simple machine is a bottle cap? (a) lever (b) inclined plane (c) screw (d) wedge
13. 13.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
14. 14.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
15. 15.Which of these is a wedge? (a) a round doorknob (b) a knife edge (c) a window blind cord (d) a road up a hill
16. 16.🏋️ A force of 490 N did 2450 J of work. How many metres did the object move?
17. 17.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
18. 18.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
19. 19.🏋️ A machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
20. 20.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
21. 21.💪 A bag has a mass of 18 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.💪 A bag has a mass of 58 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.True or false: a movable pulley stays in one place. (a) True (b) False
24. 24.⚙️ Which simple machine is a well-bucket rope wheel? (a) wedge (b) lever (c) pulley (d) screw
25. 25.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
26. 26.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
27. 27.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) friction (d) magnetism
28. 28.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
29. 29.💪 In a tug of war, one team pulls right with 60 N and the other pulls left with 40 N. What is the size of the net force, in newtons?
30. 30.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
34. 34.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
35. 35.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
36. 36.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
37. 37.⚙️ Which simple machine is a bottle opener? (a) lever (b) wedge (c) pulley (d) screw
38. 38.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.🏋️ A machine lifts a load of 180 N when you push with 60 N. What is its mechanical advantage (MA)?
40. 40.🔍 Which is the odd one out? (a) a seesaw (b) a nutcracker (c) a claw hammer on a nail (d) a flagpole rope wheel

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