Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 172 · 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.🏋️ A force of 20 N did 180 J of work. How many metres did the object move?
2. 2.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
3. 3.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) magnetic force (c) gravity (d) friction
4. 4.🪝 A pulley system lifts a 100 N load with an effort of 50 N. What is its mechanical advantage (MA)?
5. 5.⚖️ A seesaw balances. Arjun (640 N) sits 3 m from the pivot on one side; Asha (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
6. 6.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
7. 7.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
8. 8.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
9. 9.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Zoya (180 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
11. 11.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
12. 12.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
13. 13.💪 Two children push a box to the right, one with 25 N and the other with 100 N. What is the net (total) force on the box, in newtons?
14. 14.Which of these is caused by magnetic force? (a) a rolling ball slows (b) an apple falls down (c) a thrown ball comes down (d) a fridge magnet sticks
15. 15.⚙️ Which simple machine is a steering wheel? (a) pulley (b) inclined plane (c) wheel and axle (d) screw
16. 16.🏋️ A force of 370 N pushes a cart 3 m along the floor. How much work is done, in joules?
17. 17.⚙️ Which simple machine is a seesaw? (a) screw (b) inclined plane (c) lever (d) wheel and axle
18. 18.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🔍 Which is the odd one out? (a) an axe blade (b) a knife edge (c) a door stopper (d) a claw hammer on a nail
20. 20.🏋️ A force of 270 N pushes a cart 1 m along the floor. How much work is done, in joules?
21. 21.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
22. 22.🪝 A pulley system lifts a 240 N load with an effort of 120 N. What is its mechanical advantage (MA)?
23. 23.💪 A cart is pulled to the right with 30 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
24. 24.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
25. 25.True or false: a fixed pulley rises with the load. (a) True (b) False
26. 26.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
27. 27.⚙️ Which simple machine is a flagpole rope wheel? (a) inclined plane (b) lever (c) pulley (d) wheel and axle
28. 28.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 260 N bucket on the axle, in newtons? (ideal)
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
30. 30.💪 Which force is at work: a rolling ball slows? (a) friction (b) gravity (c) magnetic force (d) muscular force
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
33. 33.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
34. 34.Which of these is caused by muscular force? (a) shoes grip the floor (b) rain falls to the ground (c) pedalling a cycle (d) an apple falls down
35. 35.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4250 N box up it, in newtons? (ideal ramp, no friction)
37. 37.🏋️ A 16 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
38. 38.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) False (b) True
39. 39.🪝 A winch has a wheel of radius 15 cm and an axle of radius 5 cm. What effort on the wheel lifts a 420 N bucket on the axle, in newtons? (ideal)
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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