Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 530 · 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: skating on ice gives more friction. (a) True (b) False
2. 2.True or false: a bottle opener is a lever. (a) False (b) True
3. 3.🪝 A load of 160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
5. 5.⚙️ Which simple machine is a chisel? (a) wedge (b) inclined plane (c) lever (d) screw
6. 6.⚖️ A lever bar balances. The load is 200 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ 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?
8. 8.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
10. 10.True or false: a crane hook block is a wedge. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.True or false: kicking a football is a pull. (a) False (b) True
13. 13.Which of these is an inclined plane? (a) a knife edge (b) a wheelchair ramp (c) a crane hook block (d) a bottle cap
14. 14.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) friction (c) muscular force (d) magnetic force
15. 15.Which of these is a lever? (a) a wheelchair ramp (b) a nut and bolt (c) a seesaw (d) a well-bucket rope wheel
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
17. 17.True or false: a well-bucket rope wheel is a lever. (a) True (b) False
18. 18.⚖️ A lever bar balances. The load is ? N at 50 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?
19. 19.💪 A bag has a mass of 10 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
21. 21.Which of these is caused by friction? (a) lifting a school bag (b) rubbing hands warms them (c) squeezing a lemon (d) a magnet picks up pins
22. 22.Which of these is a screw? (a) a steering wheel (b) a nutcracker (c) a nut and bolt (d) a claw hammer on a nail
23. 23.True or false: pushing a trolley is a push. (a) False (b) True
24. 24.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a bottle cap (c) a playground slide (d) a well winch handle
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a box pushed on carpet (d) powder on a carrom board
26. 26.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) near the fulcrum (d) far from the fulcrum
27. 27.🪝 A well winch has a handle (wheel) of radius 14 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
28. 28.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
29. 29.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) the same effort (d) no effort
30. 30.True or false: a beam balance is a class 2 lever (load in the middle). (a) False (b) True
31. 31.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
32. 32.🏋️ An 8 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
34. 34.True or false: an axe blade is a pulley. (a) False (b) True
35. 35.💪 A cart is pulled to the right with 50 N and to the left with 65 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
36. 36.True or false: a movable pulley stays in one place. (a) True (b) False
37. 37.Which of these is a wheel and axle? (a) a wheelchair ramp (b) a flagpole rope wheel (c) a seesaw (d) a round doorknob
38. 38.💪 Two children push a box to the right, one with 50 N and the other with 65 N. What is the net (total) force on the box, in newtons?
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.True or false: a box pushed on carpet gives less friction. (a) False (b) True

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