Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 549 · 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 bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.True or false: a well-bucket rope wheel is an inclined plane. (a) True (b) False
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) a water tap handle (b) a nutcracker (c) a bottle opener (d) a crowbar
5. 5.True or false: pulling a cart is a push. (a) True (b) False
6. 6.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2400 N box up it, in newtons? (ideal ramp, no friction)
7. 7.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
8. 8.Which of these is a lever? (a) a well-bucket rope wheel (b) a steering wheel (c) a playground slide (d) a claw hammer on a nail
9. 9.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
10. 10.💪 Which force is at work: a magnet picks up pins? (a) gravity (b) magnetic force (c) muscular force (d) friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
12. 12.🏋️ A force of 410 N did 1640 J of work. How many metres did the object move?
13. 13.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
14. 14.💪 Two children push a box to the right, one with 65 N and the other with 40 N. What is the net (total) force on the box, in newtons?
15. 15.Which of these is a screw? (a) a steering wheel (b) a playground slide (c) a wood screw (d) a flagpole rope wheel
16. 16.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
17. 17.🪝 A well winch has a handle (wheel) of radius 30 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
18. 18.True or false: a fishing rod is a class 2 lever (load in the middle). (a) False (b) True
19. 19.🏋️ A force of 490 N did 980 J of work. How many metres did the object move?
20. 20.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
21. 21.💪 A bag has a mass of 23 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.🏋️ A 20 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
24. 24.True or false: kicking a football is a push. (a) False (b) True
25. 25.True or false: pulling up your socks is a pull. (a) False (b) True
26. 26.Which of these is caused by gravity? (a) lifting a school bag (b) a rolling ball slows (c) an apple falls down (d) shoes grip the floor
27. 27.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
28. 28.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
29. 29.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
30. 30.True or false: a rough doormat gives less friction. (a) True (b) False
31. 31.⚖️ A lever bar balances. The load is 490 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
33. 33.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
34. 34.True or false: a crowbar is a class 3 lever (effort in the middle). (a) True (b) False
35. 35.True or false: plucking a mango is a push. (a) True (b) False
36. 36.⚙️ Which simple machine is a nutcracker? (a) wedge (b) lever (c) screw (d) wheel and axle
37. 37.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
39. 39.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
40. 40.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction

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