Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 421 · 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 grippy rubber sole gives less friction. (a) False (b) True
2. 2.🏋️ A 6 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.🏋️ Pushing a crate 3 m took 300 J of work. What force was used, in newtons?
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.⚖️ A seesaw balances. Ravi (400 N) sits ? m from the pivot on one side; Zoya (400 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
6. 6.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1250 N box up it, in newtons? (ideal ramp, no friction)
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.💪 Which force is at work: lifting a school bag? (a) gravity (b) friction (c) magnetic force (d) muscular force
11. 11.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
12. 12.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
13. 13.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the axle
16. 16.True or false: a well-bucket rope wheel is a pulley. (a) False (b) True
17. 17.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
18. 18.💪 In a tug of war, one team pulls left with 50 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
19. 19.Which of these is a pulley? (a) a crane hook block (b) an axe blade (c) a truck loading ramp (d) a water tap handle
20. 20.🪝 A pulley system lifts a 120 N load with an effort of 60 N. What is its mechanical advantage (MA)?
21. 21.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
22. 22.Which of these is a lever? (a) a door stopper (b) a wheelchair ramp (c) a bottle opener (d) a playground slide
23. 23.🏋️ Work is done when a force moves something … (a) through a distance (b) only upwards (c) very slowly (d) without moving it
24. 24.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
25. 25.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Kabir (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.True or false: pressing a doorbell is a push. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
28. 28.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 3 (d) 6
31. 31.🪝 A pulley system lifts a 340 N load with an effort of 170 N. What is its mechanical advantage (MA)?
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
33. 33.⚖️ 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 2 (c) class 1
34. 34.Which of these is caused by gravity? (a) rubbing hands warms them (b) brakes stop a bicycle (c) rain falls to the ground (d) a fridge magnet sticks
35. 35.💪 A bag has a mass of 39 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
38. 38.🏋️ A 16 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
40. 40.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?

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