Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 25 · 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 of these is a lever? (a) the tip of a nail (b) a truck loading ramp (c) a wood screw (d) a crowbar
2. 2.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load × effort (d) load + effort
3. 3.Which of these is caused by muscular force? (a) a thrown ball comes down (b) pedalling a cycle (c) a rolling ball slows (d) rubbing hands warms them
4. 4.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
5. 5.⚙️ Which simple machine is a claw hammer on a nail? (a) lever (b) inclined plane (c) wheel and axle (d) screw
6. 6.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
7. 7.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
8. 8.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) the bar is short (d) turning effects match
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a rough doormat
10. 10.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Ravi (420 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 A load of 360 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🏋️ A machine lifts a load of 100 N when you push with 20 N. What is its mechanical advantage (MA)?
15. 15.⚖️ A lever bar balances. The load is 300 N at ? cm from the fulcrum. The effort is 300 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.💪 Two children push a box to the right, one with 35 N and the other with 95 N. What is the net (total) force on the box, in newtons?
17. 17.Which of these is caused by muscular force? (a) rain falls to the ground (b) lifting a school bag (c) rubbing hands warms them (d) a river flows downhill
18. 18.💪 A box weighs 250 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
19. 19.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
20. 20.Which of these is a wheel and axle? (a) a well-bucket rope wheel (b) a round doorknob (c) a playground slide (d) a nut and bolt
21. 21.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
22. 22.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
23. 23.True or false: sand on a slippery path gives more friction. (a) True (b) False
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
25. 25.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
26. 26.⚙️ Which simple machine is a round doorknob? (a) wedge (b) lever (c) wheel and axle (d) screw
27. 27.True or false: a tug of war is a push. (a) True (b) False
28. 28.🏋️ A force of 380 N pushes a cart 7 m along the floor. How much work is done, in joules?
29. 29.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
30. 30.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
31. 31.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
32. 32.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
33. 33.⚖️ A seesaw balances. Ravi (220 N) sits 1 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.🏋️ Pushing a crate 4 m took 120 J of work. What force was used, in newtons?
35. 35.🏋️ Pushing a crate 7 m took 1120 J of work. What force was used, in newtons?
36. 36.🏋️ A force of 360 N did 1440 J of work. How many metres did the object move?
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
38. 38.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
39. 39.🏋️ A 4 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1

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