Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 104 · 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 is the odd one out? (a) a bottle opener (b) a steering wheel (c) a nutcracker (d) a seesaw
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
3. 3.True or false: closing a drawer is a pull. (a) True (b) False
4. 4.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
5. 5.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 270 N bucket on the axle, in newtons? (ideal)
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🪝 A load of 200 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.⚙️ Which simple machine is a bottle opener? (a) screw (b) wheel and axle (c) pulley (d) lever
10. 10.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.🏋️ Pushing a crate 5 m took 550 J of work. What force was used, in newtons?
12. 12.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) lever (c) wheel and axle (d) screw
13. 13.True or false: a movable pulley needs effort = load. (a) True (b) False
14. 14.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
15. 15.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) muscular force (c) gravity (d) friction
16. 16.⚖️ A seesaw balances. Meena (190 N) sits 1 m from the pivot on one side; Zoya (190 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
17. 17.Which of these is a screw? (a) the tip of a nail (b) a jar lid (c) a bottle opener (d) a wheelchair ramp
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) nothing (c) the fulcrum (d) the effort
19. 19.🪝 A pulley system lifts a 180 N load with an effort of 60 N. What is its mechanical advantage (MA)?
20. 20.🪝 A pulley system lifts an 810 N load with an effort of 270 N. What is its mechanical advantage (MA)?
21. 21.True or false: pushing a trolley is a push. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a wet tiled floor (d) chalk on a gym bar
23. 23.🏋️ Work is done when a force moves something … (a) through a distance (b) without moving it (c) very slowly (d) only upwards
24. 24.True or false: a fixed pulley only changes direction. (a) False (b) True
25. 25.⚖️ A lever bar balances. The load is 90 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: sand on a slippery path gives less friction. (a) False (b) True
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
29. 29.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) joule (J) (d) watt hour
30. 30.🏋️ A force of 230 N did 460 J of work. How many metres did the object move?
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) chalk on a gym bar (d) a smooth steel slide
32. 32.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
34. 34.💪 A cart is pulled to the right with 25 N and to the left with 40 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
35. 35.🏋️ Pushing a crate 9 m took 3330 J of work. What force was used, in newtons?
36. 36.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
37. 37.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
39. 39.🏋️ A force of 210 N pushes a cart 9 m along the floor. How much work is done, in joules?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?

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