Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 704 · 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.True or false: closing a drawer is a push. (a) True (b) False
2. 2.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
3. 3.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
4. 4.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) distance from fulcrum (d) time taken
5. 5.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
6. 6.True or false: a crowbar is a wedge. (a) True (b) False
7. 7.💪 Which force is at work: brakes stop a bicycle? (a) muscular force (b) friction (c) magnetic force (d) gravity
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
9. 9.True or false: an axe blade is a wedge. (a) False (b) True
10. 10.True or false: a door stopper is an inclined plane. (a) True (b) False
11. 11.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
12. 12.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
13. 13.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
14. 14.🪝 A load of 320 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
16. 16.💪 A bag has a mass of 55 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
17. 17.⚖️ Which class of lever is a pair of tweezers? (a) class 2 (b) class 1 (c) class 3
18. 18.⚖️ A seesaw balances. Arjun (260 N) sits 3 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
20. 20.💪 Which force is at work: a river flows downhill? (a) muscular force (b) gravity (c) magnetic force (d) friction
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) doubled (c) balanced (d) gravity
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
23. 23.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 100 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.True or false: a knife edge is a screw. (a) True (b) False
25. 25.🏋️ A force of 160 N did 320 J of work. How many metres did the object move?
26. 26.🏋️ A force of 80 N did 80 J of work. How many metres did the object move?
27. 27.Which of these is caused by gravity? (a) an apple falls down (b) a compass needle turns (c) brakes stop a bicycle (d) lifting a school bag
28. 28.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a bent lever (d) a tiny pulley
29. 29.🔍 Which is the odd one out? (a) a playground slide (b) a nutcracker (c) a crowbar (d) a seesaw
30. 30.⚖️ A seesaw balances. Ravi (360 N) sits ? m from the pivot on one side; Zoya (480 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
32. 32.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) only upwards (d) without moving it
33. 33.💪 Which force is at work: a rolling ball slows? (a) magnetic force (b) gravity (c) friction (d) muscular force
34. 34.⚖️ A lever bar balances. The load is 280 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
36. 36.💪 Which force pulls everything towards the Earth? (a) gravity (b) magnetism (c) wind (d) friction
37. 37.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
39. 39.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
40. 40.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?

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