Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 450 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
2. 2.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
3. 3.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) chalk on a gym bar (d) a box pushed on carpet
5. 5.🏋️ A force of 420 N pushes a cart 8 m along the floor. How much work is done, in joules?
6. 6.True or false: a nutcracker is a screw. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
8. 8.🔍 Which is the odd one out? (a) a crane hook block (b) a window blind cord (c) a flagpole rope wheel (d) a screw jack
9. 9.True or false: drawing up a well bucket is a push. (a) False (b) True
10. 10.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 3500 N box up it, in newtons? (ideal ramp, no friction)
11. 11.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) balanced (d) unbalanced
14. 14.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
15. 15.💪 In a tug of war, one team pulls right with 15 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
19. 19.🏋️ A force of 350 N did 700 J of work. How many metres did the object move?
20. 20.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
23. 23.⚙️ Which simple machine is a door stopper? (a) inclined plane (b) pulley (c) wedge (d) screw
24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
25. 25.💪 Which force is at work: squeezing a lemon? (a) muscular force (b) friction (c) gravity (d) magnetic force
26. 26.🔍 Which is the odd one out? (a) a well winch handle (b) a well-bucket rope wheel (c) a steering wheel (d) a round doorknob
27. 27.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) stop all friction (d) switch off gravity
28. 28.🏋️ A force of 140 N pushes a cart 4 m along the floor. How much work is done, in joules?
29. 29.💪 Which force is at work: rubbing hands warms them? (a) friction (b) gravity (c) muscular force (d) magnetic force
30. 30.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.🏋️ A force of 320 N pushes a cart 9 m along the floor. How much work is done, in joules?
33. 33.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
34. 34.🏋️ A force of 260 N did 2340 J of work. How many metres did the object move?
35. 35.⚙️ Which simple machine is a chisel? (a) pulley (b) screw (c) wheel and axle (d) wedge
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
38. 38.💪 Which force is at work: a rolling ball slows? (a) gravity (b) magnetic force (c) muscular force (d) friction
39. 39.💪 A cart is pulled to the right with 90 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
40. 40.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False

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