Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 121 · 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: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
3. 3.🏋️ A force of 390 N pushes a cart 7 m along the floor. How much work is done, in joules?
4. 4.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) friction (c) gravity (d) magnetic force
5. 5.Which of these is a screw? (a) a round doorknob (b) a nutcracker (c) a nut and bolt (d) a water tap handle
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) powder on a carrom board (d) sand on a slippery path
9. 9.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
10. 10.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.💪 Two children push a box to the right, one with 15 N and the other with 5 N. What is the net (total) force on the box, in newtons?
13. 13.⚖️ A seesaw balances. Arjun (450 N) sits ? m from the pivot on one side; Asha (600 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
14. 14.🏋️ A force of 210 N did 1470 J of work. How many metres did the object move?
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.True or false: kicking a football is a pull. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.💪 A bag has a mass of 35 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.⚖️ What is the pivot point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
23. 23.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Arjun (360 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.💪 Which can a force NOT do? (a) start it moving (b) change its colour (c) change its shape (d) stop it moving
25. 25.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
28. 28.🪝 A load of 120 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 12 (d) 3
30. 30.Which of these is caused by gravity? (a) brakes stop a bicycle (b) shoes grip the floor (c) a river flows downhill (d) lifting a school bag
31. 31.🛞 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 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
32. 32.⚖️ A lever bar balances. The load is 240 N at 10 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?
33. 33.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
34. 34.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
36. 36.⚙️ Which simple machine is a well-bucket rope wheel? (a) wedge (b) pulley (c) lever (d) inclined plane
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
39. 39.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
40. 40.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) newton (N) (d) metre (m)

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