Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 979 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
2. 2.⚙️ Which simple machine is the tip of a nail? (a) wheel and axle (b) screw (c) pulley (d) wedge
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
5. 5.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) friction (d) gravity
6. 6.True or false: kicking a football is a pull. (a) False (b) True
7. 7.🪝 What does a single fixed pulley change? (a) gravity (b) the colour of rope (c) the size of the load (d) the direction of pull
8. 8.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
9. 9.🔍 Which is the odd one out? (a) a round doorknob (b) a flagpole rope wheel (c) a well-bucket rope wheel (d) a crane hook block
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a bottle opener (b) a jar lid (c) a bottle cap (d) a nut and bolt
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 90 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
13. 13.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
14. 14.True or false: a claw hammer on a nail is a lever. (a) True (b) False
15. 15.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
16. 16.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a wood screw (d) a bottle opener
17. 17.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) stop all friction (d) make new energy
18. 18.🪝 A winch has a wheel of radius 8 cm and an axle of radius 4 cm. What effort on the wheel lifts a 240 N bucket on the axle, in newtons? (ideal)
19. 19.💪 A bag has a mass of 36 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
21. 21.⚖️ A lever bar balances. The load is 140 N at ? cm from the fulcrum. The effort is 210 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
23. 23.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
24. 24.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
25. 25.💪 Which can a force NOT do? (a) change its colour (b) stop it moving (c) change its shape (d) start it moving
26. 26.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a rough doormat (d) sand on a slippery path
27. 27.🏋️ A force of 320 N did 3200 J of work. How many metres did the object move?
28. 28.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Arjun (560 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
30. 30.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.🪝 A bucket weighing 140 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) on the rock (d) far from the fulcrum
34. 34.💪 A cart is pulled to the right with 75 N and to the left with 90 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
35. 35.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
36. 36.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.True or false: a bottle cap is a screw. (a) True (b) False
38. 38.Which of these is an inclined plane? (a) a crane hook block (b) a nutcracker (c) a screw jack (d) a wheelchair ramp
39. 39.Which of these is caused by muscular force? (a) shoes grip the floor (b) a compass needle turns (c) lifting a school bag (d) brakes stop a bicycle
40. 40.Which of these is a wedge? (a) a water tap handle (b) a nut and bolt (c) a door stopper (d) a wheelchair ramp

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