Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 861 · 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.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
2. 2.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) on the fulcrum (d) far from the fulcrum
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
4. 4.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
5. 5.Which of these is caused by muscular force? (a) a rolling ball slows (b) squeezing a lemon (c) rubbing hands warms them (d) brakes stop a bicycle
6. 6.True or false: a movable pulley needs effort = load. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
8. 8.True or false: a movable pulley rises with the load. (a) False (b) True
9. 9.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
10. 10.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
11. 11.💪 Two children push a box to the right, one with 50 N and the other with 40 N. What is the net (total) force on the box, in newtons?
12. 12.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
13. 13.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (200 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
14. 14.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
15. 15.🏋️ A force of 80 N did 160 J of work. How many metres did the object move?
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
17. 17.🏋️ A force of 310 N did 1240 J of work. How many metres did the object move?
18. 18.Which of these is a wedge? (a) a bottle cap (b) a crowbar (c) a chisel (d) a steering wheel
19. 19.⚖️ A seesaw balances. Meena (300 N) sits 2 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.⚙️ Which simple machine is a knife edge? (a) wheel and axle (b) screw (c) pulley (d) wedge
22. 22.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🪝 A well winch has a handle (wheel) of radius 28 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
27. 27.⚖️ A seesaw balances. Ravi (800 N) sits ? m from the pivot on one side; Asha (600 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
28. 28.💪 Two children push a box to the right, one with 50 N and the other with 85 N. What is the net (total) force on the box, in newtons?
29. 29.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
30. 30.💪 Two children push a box to the right, one with 15 N and the other with 25 N. What is the net (total) force on the box, in newtons?
31. 31.True or false: skating on ice gives less friction. (a) False (b) True
32. 32.True or false: pushing a trolley is a push. (a) False (b) True
33. 33.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
34. 34.🏋️ A force of 270 N pushes a cart 8 m along the floor. How much work is done, in joules?
35. 35.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
36. 36.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) sand on a slippery path (d) skating on ice
38. 38.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
39. 39.🏋️ A machine lifts a load of 360 N when you push with 180 N. What is its mechanical advantage (MA)?
40. 40.⚙️ Which simple machine is a water tap handle? (a) screw (b) inclined plane (c) pulley (d) wheel and axle

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