Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 788 · 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: a fixed pulley only changes direction. (a) True (b) False
2. 2.True or false: a tug of war is a push. (a) True (b) False
3. 3.Which of these is a lever? (a) a nutcracker (b) a chisel (c) a crane hook block (d) a flagpole rope wheel
4. 4.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) turning effects match (d) the bar is short
5. 5.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats
6. 6.💪 A cart is pulled to the right with 25 N and to the left with 30 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
7. 7.True or false: a nut and bolt is a screw. (a) True (b) False
8. 8.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
9. 9.True or false: chalk on a gym bar gives less friction. (a) False (b) True
10. 10.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 3 (c) 10 (d) 6
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
12. 12.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
13. 13.True or false: a claw hammer on a nail is a lever. (a) False (b) True
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 100 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
15. 15.⚖️ Which class of lever is a wheelbarrow? (a) class 1 (b) class 2 (c) class 3
16. 16.Which of these is a wheel and axle? (a) a round doorknob (b) a flagpole rope wheel (c) a wood screw (d) a crane hook block
17. 17.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
18. 18.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 3 (c) class 2
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
20. 20.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
21. 21.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
22. 22.🏋️ A force of 320 N pushes a cart 2 m along the floor. How much work is done, in joules?
23. 23.Which of these is a wheel and axle? (a) a water tap handle (b) a claw hammer on a nail (c) a chisel (d) the tip of a nail
24. 24.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) switch off gravity (c) stop all friction (d) make new energy
25. 25.Which of these is a pulley? (a) a water tap handle (b) a crane hook block (c) a knife edge (d) a jar lid
26. 26.⚖️ A lever bar balances. The load is 480 N at ? cm from the fulcrum. The effort is 400 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
29. 29.⚖️ A seesaw balances. Ravi (440 N) sits ? m from the pivot on one side; Meena (110 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
30. 30.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
31. 31.Which of these is a wedge? (a) a road up a hill (b) a water tap handle (c) a truck loading ramp (d) a chisel
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
34. 34.🪝 A winch has a wheel of radius 2 cm and an axle of radius 1 cm. What effort on the wheel lifts a 40 N bucket on the axle, in newtons? (ideal)
35. 35.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
36. 36.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
37. 37.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
38. 38.🪝 A pulley system lifts a 300 N load with an effort of 100 N. What is its mechanical advantage (MA)?
39. 39.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
40. 40.True or false: a screw jack is an inclined plane. (a) True (b) False

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