Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 941 · 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 lever bar balances. The load is 490 N at 40 cm from the fulcrum. The effort is 280 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚙️ Which simple machine is a wood screw? (a) lever (b) inclined plane (c) pulley (d) screw
3. 3.🪝 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
4. 4.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 20 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
6. 6.Which of these is a screw? (a) a flagpole rope wheel (b) a nutcracker (c) a truck loading ramp (d) a nut and bolt
7. 7.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
8. 8.Which of these is an inclined plane? (a) a well-bucket rope wheel (b) a crane hook block (c) a wood screw (d) a wheelchair ramp
9. 9.True or false: pushing a swing is a pull. (a) True (b) False
10. 10.Which of these is caused by gravity? (a) a river flows downhill (b) a rolling ball slows (c) lifting a school bag (d) rubbing hands warms them
11. 11.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 30 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
13. 13.True or false: a rough doormat gives less friction. (a) False (b) True
14. 14.💪 Which force is at work: lifting a school bag? (a) friction (b) magnetic force (c) gravity (d) muscular force
15. 15.Which of these is caused by friction? (a) pedalling a cycle (b) rain falls to the ground (c) brakes stop a bicycle (d) a compass needle turns
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.Which of these is caused by magnetic force? (a) squeezing a lemon (b) rain falls to the ground (c) brakes stop a bicycle (d) a compass needle turns
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a grippy rubber sole (d) a wet tiled floor
23. 23.True or false: a lemon squeezer is a class 1 lever (fulcrum in the middle). (a) True (b) False
24. 24.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
25. 25.🏋️ A machine lifts a load of 150 N when you push with 50 N. What is its mechanical advantage (MA)?
26. 26.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) far from the fulcrum (c) on the rock (d) on the fulcrum
27. 27.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load × effort (c) load ÷ effort (d) load + effort
28. 28.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
29. 29.⚖️ A seesaw balances. Zoya (120 N) sits ? m from the pivot on one side; Ravi (240 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
30. 30.Which of these is caused by friction? (a) squeezing a lemon (b) a fridge magnet sticks (c) an apple falls down (d) shoes grip the floor
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) powder on a carrom board (d) a rough doormat
32. 32.💪 A cart is pulled to the right with 90 N and to the left with 100 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
33. 33.🪝 A bucket weighing 160 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
35. 35.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
36. 36.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
37. 37.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
38. 38.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
39. 39.True or false: a seesaw is a wedge. (a) True (b) False
40. 40.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly

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