Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 724 · 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 bucket weighing 210 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.True or false: a movable pulley only changes direction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
4. 4.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
5. 5.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) both weights are equal (d) the fulcrum moves
6. 6.🪝 A pulley system lifts a 140 N load with an effort of 70 N. What is its mechanical advantage (MA)?
7. 7.🏋️ Pushing a crate 8 m took 4000 J of work. What force was used, in newtons?
8. 8.True or false: a movable pulley needs effort = load. (a) True (b) False
9. 9.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the axle (d) the effort
10. 10.💪 A cart is pulled to the right with 30 N and to the left with 25 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
11. 11.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) watt hour (d) joule (J)
12. 12.⚖️ A seesaw balances. Asha (110 N) sits 4 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) rain falls to the ground (c) an apple falls down (d) a river flows downhill
14. 14.True or false: a tyre with deep treads gives more friction. (a) False (b) True
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
17. 17.🏋️ A force of 150 N did 300 J of work. How many metres did the object move?
18. 18.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
19. 19.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) two ramps back to back (d) a bar on a pivot
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) a wheel on ball bearings
21. 21.🔍 Which is the odd one out? (a) a well winch handle (b) a claw hammer on a nail (c) a bottle opener (d) a crowbar
22. 22.🪝 More rope sections holding a load means … (a) less effort needed (b) the load floats (c) no change (d) more effort needed
23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
24. 24.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 150 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) time taken (d) distance from fulcrum
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
27. 27.🏋️ A longer ramp to the same height needs … (a) more effort (b) no effort (c) the same effort (d) less effort
28. 28.🪝 A well winch has a handle (wheel) of radius 10 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
29. 29.💪 A cart is pulled to the right with 90 N and to the left with 95 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
30. 30.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
31. 31.True or false: a fixed pulley halves the effort. (a) True (b) False
32. 32.Which of these is caused by magnetic force? (a) an apple falls down (b) a thrown ball comes down (c) a compass needle turns (d) shoes grip the floor
33. 33.Which of these is a pulley? (a) a screw jack (b) a door stopper (c) a crane hook block (d) a nutcracker
34. 34.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
35. 35.Which of these is caused by friction? (a) a compass needle turns (b) pedalling a cycle (c) rubbing hands warms them (d) a river flows downhill
36. 36.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) unbalanced (c) balanced (d) gravity
37. 37.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
38. 38.⚙️ Which simple machine is a screw jack? (a) wheel and axle (b) pulley (c) screw (d) inclined plane
39. 39.⚖️ A lever bar balances. The load is 240 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction

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