Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 804 · 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.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a flagpole rope wheel (d) a chisel
2. 2.🪝 More rope sections holding a load means … (a) the load floats (b) less effort needed (c) more effort needed (d) no change
3. 3.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
4. 4.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
5. 5.💪 In which unit do we measure force? (a) newton (N) (b) litre (L) (c) metre (m) (d) second (s)
6. 6.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) an apple falls down (c) rain falls to the ground (d) a rolling ball slows
7. 7.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
10. 10.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
11. 11.💪 Which force pulls everything towards the Earth? (a) gravity (b) friction (c) wind (d) magnetism
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) sand on a slippery path (d) powder on a carrom board
13. 13.💪 Which force is at work: lifting a school bag? (a) friction (b) gravity (c) muscular force (d) magnetic force
14. 14.🏋️ A force of 260 N did 520 J of work. How many metres did the object move?
15. 15.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Arjun (110 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
19. 19.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
20. 20.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a ramp wrapped round (d) a bent lever
21. 21.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Meena (170 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
23. 23.🔍 Which is the odd one out? (a) a nut and bolt (b) a wood screw (c) a knife edge (d) a bottle cap
24. 24.True or false: hitting a cricket ball is a pull. (a) True (b) False
25. 25.💪 A cart is pulled to the right with 70 N and to the left with 60 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
26. 26.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
27. 27.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) the fulcrum moves (d) both weights are equal
28. 28.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
29. 29.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) make new energy (d) switch off gravity
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🪝 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
32. 32.🔍 Which is the odd one out? (a) a road up a hill (b) a playground slide (c) a jar lid (d) a truck loading ramp
33. 33.🪝 A well winch has a handle (wheel) of radius 3 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
34. 34.⚖️ A seesaw balances. Meena (520 N) sits ? m from the pivot on one side; Zoya (130 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
37. 37.⚖️ A lever bar balances. The load is 350 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🏋️ A force of 440 N pushes a cart 10 m along the floor. How much work is done, in joules?
39. 39.True or false: a nutcracker is a class 3 lever (effort in the middle). (a) False (b) True
40. 40.⚙️ Which simple machine is a crane hook block? (a) wedge (b) wheel and axle (c) pulley (d) lever

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