Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 251 · 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 machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
2. 2.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
3. 3.True or false: pulling up your socks is a push. (a) False (b) True
4. 4.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) squeezing a lemon (c) an apple falls down (d) a fridge magnet sticks
5. 5.True or false: a crane hook block is a screw. (a) False (b) True
6. 6.True or false: a nut and bolt is a wheel and axle. (a) True (b) False
7. 7.True or false: a box pushed on carpet gives more friction. (a) False (b) True
8. 8.True or false: an axe blade is a wedge. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
10. 10.⚙️ Which simple machine is a crane hook block? (a) pulley (b) lever (c) inclined plane (d) screw
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) a smooth steel slide
12. 12.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
13. 13.True or false: pushing a trolley is a push. (a) False (b) True
14. 14.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚖️ A lever bar balances. The load is 250 N at 30 cm from the fulcrum. The effort is 150 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.True or false: a seesaw is a class 3 lever (effort in the middle). (a) True (b) False
17. 17.🪝 What does a single fixed pulley change? (a) gravity (b) the direction of pull (c) the colour of rope (d) the size of the load
18. 18.Which of these is an inclined plane? (a) a bottle cap (b) a truck loading ramp (c) a crowbar (d) a claw hammer on a nail
19. 19.⚙️ Which simple machine is a knife edge? (a) screw (b) pulley (c) wedge (d) lever
20. 20.🏋️ A force of 350 N did 1050 J of work. How many metres did the object move?
21. 21.🪝 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?
22. 22.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
24. 24.🏋️ A force of 390 N did 2730 J of work. How many metres did the object move?
25. 25.Which of these is a pulley? (a) a nutcracker (b) a bottle opener (c) a well winch handle (d) a window blind cord
26. 26.⚖️ A lever bar balances. The load is 150 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.⚖️ A seesaw balances. Asha (480 N) sits 4 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
29. 29.Which of these is a screw? (a) an axe blade (b) a flagpole rope wheel (c) a bottle opener (d) a jar lid
30. 30.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
31. 31.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 3 (c) class 1
32. 32.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Arjun (680 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: a tyre with deep treads gives more friction. (a) True (b) False
36. 36.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
37. 37.🏋️ A force of 130 N pushes a cart 3 m along the floor. How much work is done, in joules?
38. 38.True or false: a movable pulley is on a flagpole top. (a) True (b) False
39. 39.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
40. 40.💪 Which force is at work: rain falls to the ground? (a) magnetic force (b) muscular force (c) friction (d) gravity

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