Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 669 · 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 can a force NOT do? (a) change its shape (b) start it moving (c) change its colour (d) stop it moving
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
4. 4.🔍 Which is the odd one out? (a) a door stopper (b) a water tap handle (c) an axe blade (d) the tip of a nail
5. 5.⚖️ A lever bar balances. The load is 450 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.⚖️ A seesaw balances. Ravi (140 N) sits 3 m from the pivot on one side; Meena (420 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
7. 7.True or false: hitting a cricket ball is a pull. (a) False (b) True
8. 8.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a sharp wedge (c) a smaller rod (axle) (d) a loose rope
9. 9.🏋️ A smooth ramp is 10 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
10. 10.Which of these is caused by magnetic force? (a) a compass needle turns (b) shoes grip the floor (c) brakes stop a bicycle (d) a thrown ball comes down
11. 11.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) colour of bar (d) distance from fulcrum
12. 12.⚖️ A seesaw balances. Zoya (260 N) sits ? m from the pivot on one side; Ravi (130 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
14. 14.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) True (b) False
15. 15.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the load (c) the fulcrum (d) the axle
16. 16.Which of these is caused by friction? (a) a compass needle turns (b) pedalling a cycle (c) lifting a school bag (d) rubbing hands warms them
17. 17.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
18. 18.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
19. 19.⚙️ Which simple machine is a nutcracker? (a) lever (b) wedge (c) wheel and axle (d) pulley
20. 20.💪 Which force is at work: a rolling ball slows? (a) gravity (b) friction (c) magnetic force (d) muscular force
21. 21.True or false: a knife edge is a lever. (a) True (b) False
22. 22.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) skating on ice (d) sand on a slippery path
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
26. 26.True or false: a round doorknob is a pulley. (a) True (b) False
27. 27.💪 Which force pulls everything towards the Earth? (a) wind (b) magnetism (c) friction (d) gravity
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
29. 29.💪 A force is a … (a) push or a pull (b) unit of time (c) type of sound (d) kind of colour
30. 30.⚖️ A lever bar balances. The load is 480 N at 10 cm from the fulcrum. The effort is 60 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.True or false: a smooth steel slide gives less friction. (a) False (b) True
34. 34.🏋️ A force of 420 N did 2100 J of work. How many metres did the object move?
35. 35.💪 A cart is pulled to the right with 85 N and to the left with 85 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
36. 36.🏋️ A force of 420 N did 2940 J of work. How many metres did the object move?
37. 37.🏋️ A force of 380 N did 2660 J of work. How many metres did the object move?
38. 38.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
39. 39.⚖️ A lever bar balances. The load is 210 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?
40. 40.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?

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