Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 944 · 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.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.💪 A cart is pulled to the right with 80 N and to the left with 90 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
3. 3.🪝 A load of 320 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
4. 4.🏋️ Pushing a crate 5 m took 450 J of work. What force was used, in newtons?
5. 5.Which of these is a screw? (a) a window blind cord (b) a nut and bolt (c) the tip of a nail (d) a chisel
6. 6.True or false: a movable pulley is on a flagpole top. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a crane hook block (b) a flagpole rope wheel (c) a door stopper (d) a window blind cord
8. 8.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
9. 9.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
14. 14.🪝 A load of 870 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.🏋️ A force of 210 N did 210 J of work. How many metres did the object move?
16. 16.⚖️ A seesaw balances. Asha (280 N) sits 4 m from the pivot on one side; Arjun (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.Which of these is a wheel and axle? (a) a playground slide (b) a well winch handle (c) a bottle cap (d) a bottle opener
20. 20.🛞 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 carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
21. 21.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
22. 22.Which of these is a pulley? (a) a nutcracker (b) a well-bucket rope wheel (c) an axe blade (d) a bottle opener
23. 23.💪 Which force is at work: pedalling a cycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
24. 24.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
25. 25.💪 A bag has a mass of 4 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
26. 26.Which of these is a lever? (a) a nutcracker (b) a crane hook block (c) an axe blade (d) a round doorknob
27. 27.🏋️ A force of 280 N pushes a cart 1 m along the floor. How much work is done, in joules?
28. 28.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) friction (d) magnetic force
29. 29.⚖️ A seesaw balances. Kabir (300 N) sits 3 m from the pivot on one side; Asha (300 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
33. 33.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a smaller rod (axle) (d) a loose rope
34. 34.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) magnetic force (c) friction (d) muscular force
35. 35.🏋️ A 6 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 3 (c) class 2
37. 37.⚙️ Which simple machine is a crane hook block? (a) screw (b) inclined plane (c) pulley (d) wheel and axle
38. 38.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
39. 39.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
40. 40.⚖️ A lever bar balances. The load is 140 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?

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