Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 241 · 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 machine lifts a load of 720 N when you push with 180 N. What is its mechanical advantage (MA)?
2. 2.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
3. 3.🏋️ A force of 160 N pushes a cart 7 m along the floor. How much work is done, in joules?
4. 4.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
5. 5.True or false: a fixed pulley only changes direction. (a) False (b) True
6. 6.⚖️ A seesaw balances. Meena (800 N) sits ? m from the pivot on one side; Zoya (200 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
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 1 (c) class 3
8. 8.🏋️ A machine lifts a load of 650 N when you push with 130 N. What is its mechanical advantage (MA)?
9. 9.🔍 Which is the odd one out? (a) a steering wheel (b) a crane hook block (c) a flagpole rope wheel (d) a well-bucket rope wheel
10. 10.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) a river flows downhill (d) an apple falls down
11. 11.Which of these is a lever? (a) a nutcracker (b) a jar lid (c) a well-bucket rope wheel (d) a screw jack
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.True or false: drawing up a well bucket is a push. (a) True (b) False
14. 14.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
15. 15.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
16. 16.💪 A cart is pulled to the right with 50 N and to the left with 55 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
17. 17.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
18. 18.True or false: a smooth steel slide gives more friction. (a) False (b) True
19. 19.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
20. 20.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
21. 21.Which of these is caused by friction? (a) a rolling ball slows (b) a fridge magnet sticks (c) rain falls to the ground (d) pedalling a cycle
22. 22.True or false: plucking a mango is a push. (a) False (b) True
23. 23.Which of these is caused by magnetic force? (a) squeezing a lemon (b) brakes stop a bicycle (c) a magnet picks up pins (d) a thrown ball comes down
24. 24.💪 Two children push a box to the right, one with 20 N and the other with 30 N. What is the net (total) force on the box, in newtons?
25. 25.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
26. 26.💪 In a tug of war, one team pulls left with 10 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
27. 27.🏋️ In which unit is work measured? (a) watt hour (b) newton (N) (c) joule (J) (d) metre (m)
28. 28.True or false: a beam balance is a class 3 lever (effort in the middle). (a) True (b) False
29. 29.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.⚖️ A seesaw balances. Kabir (560 N) sits ? m from the pivot on one side; Asha (420 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
31. 31.💪 Which can a force NOT do? (a) change its shape (b) start it moving (c) stop it moving (d) change its colour
32. 32.⚖️ A lever bar balances. The load is 480 N at 30 cm from the fulcrum. The effort is 180 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
33. 33.💪 Which force is at work: a thrown ball comes down? (a) magnetic force (b) gravity (c) muscular force (d) friction
34. 34.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 80 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the effort (c) the load (d) the fulcrum
36. 36.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
37. 37.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
38. 38.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 3 (c) class 2
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
40. 40.Which of these is a lever? (a) a seesaw (b) a door stopper (c) a bottle cap (d) a window blind cord

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids