Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 992 · 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 bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
2. 2.⚙️ Which simple machine is a nutcracker? (a) wedge (b) screw (c) lever (d) pulley
3. 3.🪝 A pulley system lifts a 760 N load with an effort of 190 N. What is its mechanical advantage (MA)?
4. 4.True or false: a movable pulley is on a flagpole top. (a) True (b) False
5. 5.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
6. 6.True or false: pulling a cart is a pull. (a) False (b) True
7. 7.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) mass of fulcrum (d) distance from fulcrum
8. 8.Which of these is a screw? (a) a door stopper (b) a knife edge (c) a screw jack (d) a crane hook block
9. 9.True or false: hitting a cricket ball is a pull. (a) False (b) True
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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a wet tiled floor (d) a grippy rubber sole
15. 15.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
16. 16.Which of these is caused by friction? (a) lifting a school bag (b) rubbing hands warms them (c) rain falls to the ground (d) a river flows downhill
17. 17.⚙️ Which simple machine is a nut and bolt? (a) pulley (b) screw (c) inclined plane (d) lever
18. 18.True or false: a fishing rod is a class 2 lever (load in the middle). (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) a rough doormat
20. 20.⚖️ A seesaw balances. Kabir (260 N) sits 1 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a ramp wrapped round (d) a bent lever
22. 22.💪 A bag has a mass of 34 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
23. 23.🪝 A winch has a wheel of radius 24 cm and an axle of radius 4 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
24. 24.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.🏋️ A 5 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.⚖️ A lever bar balances. The load is 300 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
30. 30.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
31. 31.True or false: a seesaw is a lever. (a) False (b) True
32. 32.🏋️ A force of 290 N did 1740 J of work. How many metres did the object move?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
34. 34.Which of these is a wheel and axle? (a) a claw hammer on a nail (b) a road up a hill (c) a well winch handle (d) a bottle cap
35. 35.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
36. 36.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
37. 37.True or false: powder on a carrom board gives more friction. (a) True (b) False
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
40. 40.True or false: a movable pulley hangs on the rope loop. (a) True (b) False

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