Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 33 · 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 cart is pulled to the right with 35 N and to the left with 20 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
2. 2.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
4. 4.⚖️ A seesaw balances. Meena (200 N) sits ? m from the pivot on one side; Kabir (100 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
5. 5.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
6. 6.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) stop it moving (d) change its shape
7. 7.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
10. 10.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) a rope on a wheel (d) two ramps back to back
11. 11.🪝 A load of 210 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
13. 13.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
14. 14.🏋️ A force of 320 N pushes a cart 5 m along the floor. How much work is done, in joules?
15. 15.💪 A box weighs 150 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
18. 18.True or false: a movable pulley is on a flagpole top. (a) False (b) True
19. 19.⚖️ Which class of lever is a lemon squeezer? (a) class 1 (b) class 3 (c) class 2
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
21. 21.True or false: a crane hook block is a pulley. (a) False (b) True
22. 22.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
23. 23.💪 Which force is at work: shoes grip the floor? (a) magnetic force (b) muscular force (c) gravity (d) friction
24. 24.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a ramp wrapped round (d) a bent lever
25. 25.True or false: a wheelchair ramp is a wedge. (a) True (b) False
26. 26.⚖️ A lever bar balances. The load is 560 N at 50 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?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
28. 28.🪝 A bucket weighing 110 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.🏋️ A force of 150 N pushes a cart 6 m along the floor. How much work is done, in joules?
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) powder on a carrom board
32. 32.🔍 Which is the odd one out? (a) a road up a hill (b) a knife edge (c) an axe blade (d) a door stopper
33. 33.True or false: an axe blade is a wedge. (a) True (b) False
34. 34.💪 Two children push a box to the right, one with 30 N and the other with 50 N. What is the net (total) force on the box, in newtons?
35. 35.🏋️ Pushing a crate 9 m took 3510 J of work. What force was used, in newtons?
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
37. 37.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
38. 38.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
39. 39.Which of these is caused by gravity? (a) brakes stop a bicycle (b) rain falls to the ground (c) a magnet picks up pins (d) rubbing hands warms them
40. 40.True or false: pulling a cart is a pull. (a) False (b) True

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