Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 970 · 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.Which of these is caused by friction? (a) a compass needle turns (b) a fridge magnet sticks (c) brakes stop a bicycle (d) lifting a school bag
2. 2.True or false: kicking a football is a push. (a) False (b) True
3. 3.💪 A cart is pulled to the right with 60 N and to the left with 45 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
4. 4.⚖️ A seesaw balances. Zoya (570 N) sits ? m from the pivot on one side; Meena (570 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
5. 5.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
6. 6.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.Which of these is caused by friction? (a) an apple falls down (b) lifting a school bag (c) rubbing hands warms them (d) a compass needle turns
8. 8.Which of these is a wheel and axle? (a) a flagpole rope wheel (b) a knife edge (c) a water tap handle (d) a road up a hill
9. 9.🏋️ A force of 190 N did 950 J of work. How many metres did the object move?
10. 10.True or false: a movable pulley only changes direction. (a) True (b) False
11. 11.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.💪 A box weighs 340 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
15. 15.🏋️ A force of 220 N pushes a cart 3 m along the floor. How much work is done, in joules?
16. 16.🏋️ A machine lifts a load of 90 N when you push with 30 N. What is its mechanical advantage (MA)?
17. 17.True or false: a fixed pulley needs effort = load. (a) True (b) False
18. 18.🏋️ A force of 300 N pushes a cart 4 m along the floor. How much work is done, in joules?
19. 19.🏋️ Pushing a crate 3 m took 1080 J of work. What force was used, in newtons?
20. 20.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load + effort (d) load ÷ effort
21. 21.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
22. 22.⚖️ A lever bar balances. The load is 900 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
24. 24.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
25. 25.💪 A cart is pulled to the right with 60 N and to the left with 65 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
26. 26.True or false: a fixed pulley rises with the load. (a) True (b) False
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 400 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.🏋️ A force of 40 N did 360 J of work. How many metres did the object move?
30. 30.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the fulcrum (d) the effort
31. 31.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
32. 32.💪 Two children push a box to the right, one with 25 N and the other with 50 N. What is the net (total) force on the box, 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.Which of these is a pulley? (a) a nutcracker (b) a flagpole rope wheel (c) a seesaw (d) a crowbar
35. 35.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a wheel on a rod (d) a bar on a pivot
37. 37.🔍 Which is the odd one out? (a) a window blind cord (b) a knife edge (c) a flagpole rope wheel (d) a crane hook block
38. 38.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 80 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar

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