Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 717 · 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.True or false: pushing a swing is a pull. (a) True (b) False
2. 2.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) gravity (c) magnetic force (d) friction
3. 3.🔍 Which is the odd one out? (a) a wheelchair ramp (b) a truck loading ramp (c) a bottle opener (d) a playground slide
4. 4.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
5. 5.💪 In a tug of war, one team pulls right with 55 N and the other pulls left with 45 N. What is the size of the net force, in newtons?
6. 6.True or false: a fixed pulley only changes direction. (a) True (b) False
7. 7.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
9. 9.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.🏋️ A longer ramp to the same height needs … (a) no effort (b) the same effort (c) more effort (d) less effort
11. 11.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
12. 12.True or false: opening a drawer is a push. (a) True (b) False
13. 13.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
14. 14.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
15. 15.⚙️ Which simple machine is a nutcracker? (a) screw (b) wedge (c) wheel and axle (d) lever
16. 16.True or false: a crowbar is a lever. (a) False (b) True
17. 17.🏋️ A force of 420 N pushes a cart 6 m along the floor. How much work is done, in joules?
18. 18.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
19. 19.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) muscular force (c) magnetic force (d) gravity
20. 20.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
21. 21.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, by half (c) only on Mondays (d) yes, always
22. 22.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 3 (c) class 1
23. 23.💪 Which can a force NOT do? (a) stop it moving (b) start it moving (c) change its shape (d) change its colour
24. 24.⚖️ A lever bar balances. The load is 180 N at 10 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?
25. 25.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) friction (d) wind
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🏋️ A force of 350 N pushes a cart 9 m along the floor. How much work is done, in joules?
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
29. 29.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
31. 31.⚙️ Which simple machine is an axe blade? (a) inclined plane (b) lever (c) screw (d) wedge
32. 32.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
33. 33.🏋️ Pushing a crate 7 m took 3360 J of work. What force was used, in newtons?
34. 34.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
35. 35.🏋️ A force of 100 N pushes a cart 1 m along the floor. How much work is done, in joules?
36. 36.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
37. 37.💪 Which force is at work: rubbing hands warms them? (a) magnetic force (b) friction (c) muscular force (d) gravity
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
40. 40.⚖️ A seesaw balances. Asha (420 N) sits 1 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?

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