Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 336 · 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 90 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.💪 Which force is at work: a thrown ball comes down? (a) friction (b) muscular force (c) magnetic force (d) gravity
3. 3.💪 Two children push a box to the right, one with 95 N and the other with 20 N. What is the net (total) force on the box, in newtons?
4. 4.🏋️ A force of 480 N pushes a cart 1 m along the floor. How much work is done, in joules?
5. 5.🔍 Which is the odd one out? (a) a chisel (b) a nutcracker (c) a claw hammer on a nail (d) a bottle opener
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
7. 7.True or false: the tip of a nail is a wheel and axle. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a wood screw (b) a claw hammer on a nail (c) a screw jack (d) a jar lid
9. 9.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
12. 12.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
13. 13.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
14. 14.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
15. 15.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.True or false: a playground slide is a pulley. (a) False (b) True
18. 18.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
19. 19.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) less effort (d) the same effort
20. 20.⚖️ A lever bar balances. The load is 40 N at 20 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.Which of these is caused by magnetic force? (a) rain falls to the ground (b) a thrown ball comes down (c) a compass needle turns (d) an apple falls down
22. 22.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
23. 23.🏋️ A force of 140 N pushes a cart 4 m along the floor. How much work is done, in joules?
24. 24.🪝 A bucket weighing 70 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
26. 26.True or false: a seesaw is a pulley. (a) False (b) True
27. 27.🏋️ A force of 150 N pushes a cart 4 m along the floor. How much work is done, in joules?
28. 28.True or false: pulling up your socks is a push. (a) True (b) False
29. 29.True or false: a flagpole rope wheel is a pulley. (a) False (b) True
30. 30.True or false: pulling a cart is a push. (a) True (b) False
31. 31.🪝 A bucket weighing 360 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
33. 33.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape
34. 34.⚖️ A seesaw balances. Ravi (680 N) sits 1 m from the pivot on one side; Asha (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
37. 37.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
38. 38.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) brakes stop a bicycle (c) rubbing hands warms them (d) shoes grip the floor
39. 39.⚙️ Which simple machine is a window blind cord? (a) wheel and axle (b) wedge (c) screw (d) pulley
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem

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