Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 416 · 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) less effort needed (b) more effort needed (c) no change (d) the load floats
2. 2.⚖️ A lever bar balances. The load is 630 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🪝 A bucket weighing 350 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (130 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) friction (d) gravity
6. 6.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Kabir (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
7. 7.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
8. 8.🏋️ A force of 430 N did 4300 J of work. How many metres did the object move?
9. 9.🏋️ A force of 370 N pushes a cart 9 m along the floor. How much work is done, in joules?
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
12. 12.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
13. 13.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the direction of pull (d) the colour of rope
15. 15.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
17. 17.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load + effort (c) load × effort (d) effort ÷ load
18. 18.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the axle (c) the fulcrum (d) the load
19. 19.🪝 A pulley system lifts an 80 N load with an effort of 20 N. What is its mechanical advantage (MA)?
20. 20.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
21. 21.True or false: a fixed pulley makes you pull 2× rope. (a) True (b) False
22. 22.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) False (b) True
23. 23.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
24. 24.True or false: a claw hammer on a nail is a lever. (a) False (b) True
25. 25.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
26. 26.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
27. 27.⚖️ A lever bar balances. The load is 1000 N at 40 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🏋️ A force of 150 N pushes a cart 10 m along the floor. How much work is done, in joules?
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the effort (d) the fulcrum
30. 30.True or false: a tug of war is a push. (a) True (b) False
31. 31.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) balanced (c) gravity (d) unbalanced
32. 32.🏋️ A force of 500 N pushes a cart 10 m along the floor. How much work is done, in joules?
33. 33.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
34. 34.Which of these is a wedge? (a) a crane hook block (b) a door stopper (c) a seesaw (d) a well winch handle
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
36. 36.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) False (b) True
37. 37.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) False (b) True
38. 38.💪 A box weighs 80 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
39. 39.Which of these is a pulley? (a) a nutcracker (b) a flagpole rope wheel (c) a truck loading ramp (d) a wood screw
40. 40.Which of these is caused by gravity? (a) brakes stop a bicycle (b) an apple falls down (c) a rolling ball slows (d) lifting a school bag

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