Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 90 · 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: skating on ice gives more friction. (a) True (b) False
2. 2.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
3. 3.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.Which of these is a pulley? (a) a nutcracker (b) a window blind cord (c) a road up a hill (d) a nut and bolt
5. 5.⚖️ A lever bar balances. The load is 900 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
7. 7.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) the colour of rope (d) gravity
8. 8.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
9. 9.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) yes, always (d) no, work stays the same
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
11. 11.⚖️ A seesaw balances. Meena (330 N) sits 2 m from the pivot on one side; Asha (220 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
13. 13.Which of these is an inclined plane? (a) an axe blade (b) a well winch handle (c) a truck loading ramp (d) a knife edge
14. 14.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 50 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
19. 19.⚙️ Which simple machine is an axe blade? (a) inclined plane (b) wheel and axle (c) screw (d) wedge
20. 20.Which of these is caused by gravity? (a) squeezing a lemon (b) a magnet picks up pins (c) a fridge magnet sticks (d) a river flows downhill
21. 21.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
22. 22.🏋️ A force of 300 N did 900 J of work. How many metres did the object move?
23. 23.💪 A force is a … (a) unit of time (b) push or a pull (c) kind of colour (d) type of sound
24. 24.Which of these is a wheel and axle? (a) a crane hook block (b) a screw jack (c) an axe blade (d) a water tap handle
25. 25.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.🪝 A winch has a wheel of radius 6 cm and an axle of radius 2 cm. What effort on the wheel lifts a 150 N bucket on the axle, in newtons? (ideal)
27. 27.🏋️ A force of 400 N did 2400 J of work. How many metres did the object move?
28. 28.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
29. 29.🏋️ A force of 150 N pushes a cart 7 m along the floor. How much work is done, in joules?
30. 30.⚙️ Which simple machine is a steering wheel? (a) screw (b) wedge (c) inclined plane (d) wheel and axle
31. 31.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 150 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
32. 32.True or false: a road up a hill is an inclined plane. (a) True (b) False
33. 33.⚖️ A seesaw balances. Kabir (600 N) sits 3 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🏋️ A machine lifts a load of 420 N when you push with 70 N. What is its mechanical advantage (MA)?
35. 35.⚖️ A seesaw balances. Ravi (420 N) sits ? m from the pivot on one side; Asha (140 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
37. 37.⚖️ A seesaw balances. Zoya (220 N) sits ? m from the pivot on one side; Arjun (110 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚙️ 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
39. 39.Which of these is caused by muscular force? (a) a fridge magnet sticks (b) shoes grip the floor (c) a rolling ball slows (d) pedalling a cycle
40. 40.Which of these is a wedge? (a) a road up a hill (b) a jar lid (c) an axe blade (d) a flagpole rope wheel

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