Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 57 · 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 gravity? (a) a river flows downhill (b) pedalling a cycle (c) a fridge magnet sticks (d) a rolling ball slows
2. 2.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) lever (c) pulley (d) wheel and axle
3. 3.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the rock (c) far from the fulcrum (d) on the fulcrum
4. 4.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
5. 5.Which of these is a wedge? (a) a claw hammer on a nail (b) a road up a hill (c) a knife edge (d) a steering wheel
6. 6.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
7. 7.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (440 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) only on Mondays (d) yes, by half
9. 9.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
10. 10.True or false: plucking a mango is a push. (a) True (b) False
11. 11.🏋️ A force of 310 N pushes a cart 4 m along the floor. How much work is done, in joules?
12. 12.True or false: a flagpole rope wheel is a pulley. (a) False (b) True
13. 13.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
14. 14.True or false: a crane hook block is a pulley. (a) False (b) True
15. 15.True or false: pushing a trolley is a pull. (a) False (b) True
16. 16.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
17. 17.⚖️ A seesaw balances. Kabir (680 N) sits 1 m from the pivot on one side; Asha (170 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.Which of these is caused by muscular force? (a) shoes grip the floor (b) a thrown ball comes down (c) rubbing hands warms them (d) pedalling a cycle
19. 19.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
20. 20.⚙️ Which simple machine is a nut and bolt? (a) wedge (b) pulley (c) lever (d) screw
21. 21.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
22. 22.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.Which of these is caused by muscular force? (a) an apple falls down (b) rain falls to the ground (c) lifting a school bag (d) a thrown ball comes down
25. 25.True or false: a tug of war is a push. (a) True (b) False
26. 26.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
27. 27.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the axle
28. 28.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
30. 30.True or false: a movable pulley halves the effort. (a) False (b) True
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
32. 32.🏋️ Pushing a crate 2 m took 140 J of work. What force was used, in newtons?
33. 33.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
34. 34.🏋️ In which unit is work measured? (a) watt hour (b) joule (J) (c) metre (m) (d) newton (N)
35. 35.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) the pulley
36. 36.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
38. 38.🏋️ A force of 310 N pushes a cart 6 m along the floor. How much work is done, in joules?
39. 39.💪 A cart is pulled to the right with 30 N and to the left with 40 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
40. 40.💪 Which force is at work: a river flows downhill? (a) friction (b) magnetic force (c) muscular force (d) gravity

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