Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 19 · 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 door stopper (b) a screw jack (c) a chisel (d) a knife edge
2. 2.True or false: a fixed pulley halves the effort. (a) False (b) True
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a tyre with deep treads (d) a wheel on ball bearings
5. 5.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.Which of these is caused by friction? (a) a fridge magnet sticks (b) a magnet picks up pins (c) rain falls to the ground (d) shoes grip the floor
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
9. 9.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
10. 10.🏋️ A 9 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 120 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
13. 13.True or false: a window blind cord is a screw. (a) True (b) False
14. 14.True or false: kicking a football is a push. (a) False (b) True
15. 15.True or false: a round doorknob is an inclined plane. (a) True (b) False
16. 16.True or false: the tip of a nail is a screw. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
18. 18.🪝 A pulley system lifts a 280 N load with an effort of 70 N. What is its mechanical advantage (MA)?
19. 19.🪝 A pulley system lifts a 600 N load with an effort of 200 N. What is its mechanical advantage (MA)?
20. 20.💪 Two children push a box to the right, one with 30 N and the other with 60 N. What is the net (total) force on the box, in newtons?
21. 21.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
22. 22.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its shape (d) change its colour
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) a window blind cord (b) an axe blade (c) a flagpole rope wheel (d) a well-bucket rope wheel
25. 25.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Kabir (400 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚙️ 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
27. 27.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
28. 28.💪 Which force is at work: pedalling a cycle? (a) gravity (b) friction (c) magnetic force (d) muscular force
29. 29.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
30. 30.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
31. 31.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) powder on a carrom board (d) a wheel on ball bearings
33. 33.⚙️ Most simple machines make work easier by letting us … (a) make new energy (b) stop all friction (c) switch off gravity (d) use a smaller force
34. 34.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) less effort needed (d) more effort needed
35. 35.True or false: a seesaw is a lever. (a) False (b) True
36. 36.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
37. 37.⚖️ A seesaw balances. Ravi (640 N) sits 1 m from the pivot on one side; Arjun (160 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.🏋️ Pushing a crate 4 m took 1400 J of work. What force was used, in newtons?
39. 39.🏋️ A force of 500 N pushes a cart 9 m along the floor. How much work is done, in joules?
40. 40.💪 A box weighs 20 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?

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