Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 228 · 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 caused by muscular force? (a) rubbing hands warms them (b) an apple falls down (c) a compass needle turns (d) lifting a school bag
2. 2.True or false: a box pushed on carpet gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a water tap handle (b) a round doorknob (c) a well winch handle (d) a bottle opener
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
5. 5.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
6. 6.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
7. 7.Which of these is a screw? (a) a crane hook block (b) a round doorknob (c) a playground slide (d) a wood screw
8. 8.💪 Which force is at work: squeezing a lemon? (a) gravity (b) muscular force (c) friction (d) magnetic force
9. 9.⚙️ Which simple machine is a seesaw? (a) pulley (b) lever (c) screw (d) wheel and axle
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a tyre with deep treads (d) oil on a squeaky hinge
11. 11.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
13. 13.Which of these is an inclined plane? (a) a window blind cord (b) a wheelchair ramp (c) a round doorknob (d) a door stopper
14. 14.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
16. 16.⚖️ A seesaw balances. Arjun (560 N) sits 1 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.💪 A cart is pulled to the right with 20 N and to the left with 15 N. Which way does the net force act? (a) to the left (b) no net force (c) to the right
18. 18.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
19. 19.🏋️ Pushing a crate 4 m took 600 J of work. What force was used, in newtons?
20. 20.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) wind (d) gravity
21. 21.🏋️ A 17 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
22. 22.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
23. 23.True or false: opening a drawer is a pull. (a) False (b) True
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.Which of these is caused by gravity? (a) a thrown ball comes down (b) pedalling a cycle (c) squeezing a lemon (d) a rolling ball slows
26. 26.⚙️ A screw is really … (a) a tiny pulley (b) a kind of wheel (c) a bent lever (d) a ramp wrapped round
27. 27.🔍 Which is the odd one out? (a) a chisel (b) an axe blade (c) a wheelchair ramp (d) a knife edge
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.⚙️ Which simple machine is a well winch handle? (a) wheel and axle (b) screw (c) pulley (d) inclined plane
30. 30.True or false: pulling a cart is a push. (a) False (b) True
31. 31.⚙️ Which simple machine is a chisel? (a) pulley (b) wedge (c) lever (d) screw
32. 32.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
33. 33.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
34. 34.⚖️ A lever balances when … (a) the fulcrum moves (b) the bar is short (c) turning effects match (d) both weights are equal
35. 35.🏋️ Pushing a crate 1 m took 480 J of work. What force was used, in newtons?
36. 36.⚖️ A lever bar balances. The load is 500 N at 50 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
37. 37.💪 A cart is pulled to the right with 25 N and to the left with 25 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
38. 38.Which of these is a lever? (a) a door stopper (b) a bottle opener (c) a well winch handle (d) a bottle cap
39. 39.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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