Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 954 · 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.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the effort (d) the fulcrum
2. 2.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
3. 3.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
4. 4.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) gravity (d) muscular force
5. 5.💪 A box weighs 390 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
7. 7.⚙️ Which simple machine is a steering wheel? (a) lever (b) wheel and axle (c) inclined plane (d) screw
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
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 wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) a steering wheel (b) a well winch handle (c) a water tap handle (d) a nut and bolt
11. 11.True or false: chalk on a gym bar gives less friction. (a) True (b) False
12. 12.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.True or false: a movable pulley needs effort = load. (a) True (b) False
14. 14.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) use a smaller force (d) switch off gravity
15. 15.⚖️ A lever bar balances. The load is 350 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?
16. 16.⚖️ A lever bar balances. The load is 720 N at 50 cm from the fulcrum. The effort is 450 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
18. 18.💪 A force is a … (a) kind of colour (b) push or a pull (c) unit of time (d) type of sound
19. 19.Which of these is a wheel and axle? (a) a crane hook block (b) a door stopper (c) a wheelchair ramp (d) a well winch handle
20. 20.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Meena (800 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.⚖️ A lever bar balances. The load is 60 N at 10 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
22. 22.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
23. 23.💪 Two children push a box to the right, one with 70 N and the other with 10 N. What is the net (total) force on the box, in newtons?
24. 24.⚖️ A lever bar balances. The load is 100 N at 10 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
26. 26.⚖️ A lever bar balances. The load is 350 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) chalk on a gym bar (d) a tyre with deep treads
29. 29.💪 A box weighs 250 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. 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 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
34. 34.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
35. 35.Which of these is a wedge? (a) a screw jack (b) a chisel (c) a road up a hill (d) a truck loading ramp
36. 36.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
37. 37.⚖️ A lever bar balances. The load is 600 N at 20 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.Which of these is caused by gravity? (a) a river flows downhill (b) a magnet picks up pins (c) a fridge magnet sticks (d) shoes grip the floor

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