Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 95 · 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.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.True or false: a nutcracker is a pulley. (a) False (b) True
3. 3.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the effort (d) the pulley
4. 4.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
5. 5.True or false: a tyre with deep treads gives more friction. (a) False (b) True
6. 6.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
7. 7.True or false: a tug of war is a push. (a) True (b) False
8. 8.Which of these is caused by friction? (a) brakes stop a bicycle (b) squeezing a lemon (c) lifting a school bag (d) a magnet picks up pins
9. 9.True or false: a tyre with deep treads gives less friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) skating on ice (d) chalk on a gym bar
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
12. 12.⚖️ A lever bar balances. The load is 140 N at 20 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
14. 14.💪 A cart is pulled to the right with 30 N and to the left with 15 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) oil on a squeaky hinge (d) a grippy rubber sole
17. 17.💪 Which can a force NOT do? (a) stop it moving (b) change its shape (c) change its colour (d) start it moving
18. 18.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
19. 19.⚖️ What is the pivot point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
20. 20.💪 Which force is at work: pedalling a cycle? (a) muscular force (b) gravity (c) friction (d) magnetic force
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
22. 22.🪝 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)
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
24. 24.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
25. 25.Which of these is a wheel and axle? (a) an axe blade (b) a crane hook block (c) a nutcracker (d) a steering wheel
26. 26.Which of these is caused by muscular force? (a) lifting a school bag (b) rubbing hands warms them (c) a compass needle turns (d) brakes stop a bicycle
27. 27.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
28. 28.⚖️ A seesaw balances. Zoya (150 N) sits 4 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 2 (c) class 1
30. 30.🏋️ An 8 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.💪 A bag has a mass of 16 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
32. 32.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) wheel and axle (c) lever (d) inclined plane
33. 33.True or false: skating on ice gives more friction. (a) True (b) False
34. 34.True or false: your forearm is a class 3 lever (effort in the middle). (a) False (b) True
35. 35.Which of these is a screw? (a) a truck loading ramp (b) a flagpole rope wheel (c) a screw jack (d) a claw hammer on a nail
36. 36.True or false: a movable pulley needs effort = load. (a) False (b) True
37. 37.⚖️ A lever bar balances. The load is 60 N at 30 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
39. 39.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum
40. 40.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum

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