Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 693 · 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.🏋️ Pushing a crate 4 m took 680 J of work. What force was used, in newtons?
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
4. 4.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
5. 5.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
6. 6.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
7. 7.🏋️ A machine lifts a load of 950 N when you push with 190 N. What is its mechanical advantage (MA)?
8. 8.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
9. 9.💪 A cart is pulled to the right with 20 N and to the left with 35 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
10. 10.⚖️ A lever bar balances. The load is 240 N at 20 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 90 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
17. 17.⚖️ A seesaw balances. Kabir (570 N) sits 1 m from the pivot on one side; Meena (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.⚖️ A seesaw balances. Kabir (150 N) sits 4 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.Which of these is a lever? (a) a wheelchair ramp (b) a window blind cord (c) a crowbar (d) a round doorknob
20. 20.🏋️ A force of 190 N pushes a cart 7 m along the floor. How much work is done, in joules?
21. 21.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
22. 22.💪 Two children push a box to the right, one with 5 N and the other with 20 N. What is the net (total) force on the box, in newtons?
23. 23.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
25. 25.🏋️ A force of 300 N did 1500 J of work. How many metres did the object move?
26. 26.💪 Two children push a box to the right, one with 35 N and the other with 55 N. What is the net (total) force on the box, in newtons?
27. 27.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
28. 28.🏋️ In which unit is work measured? (a) metre (m) (b) watt hour (c) newton (N) (d) joule (J)
29. 29.⚖️ A lever bar balances. The load is 900 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.Which of these is caused by muscular force? (a) rubbing hands warms them (b) pedalling a cycle (c) a thrown ball comes down (d) a magnet picks up pins
31. 31.Which of these is caused by friction? (a) an apple falls down (b) rain falls to the ground (c) a river flows downhill (d) shoes grip the floor
32. 32.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.🪝 A load of 680 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
34. 34.💪 Two children push a box to the right, one with 40 N and the other with 35 N. What is the net (total) force on the box, in newtons?
35. 35.True or false: a seesaw is an inclined plane. (a) False (b) True
36. 36.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
37. 37.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (110 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.⚙️ Which simple machine is a nut and bolt? (a) wheel and axle (b) screw (c) lever (d) inclined plane
39. 39.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Kabir (380 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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