Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 154 · 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 an inclined plane? (a) a claw hammer on a nail (b) a seesaw (c) a screw jack (d) a road up a hill
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 2 (c) class 1
4. 4.True or false: drawing up a well bucket is a push. (a) False (b) True
5. 5.🏋️ A force of 430 N pushes a cart 5 m along the floor. How much work is done, in joules?
6. 6.Which of these is caused by muscular force? (a) lifting a school bag (b) brakes stop a bicycle (c) shoes grip the floor (d) an apple falls down
7. 7.🏋️ A force of 110 N pushes a cart 9 m along the floor. How much work is done, in joules?
8. 8.🏋️ A force of 150 N pushes a cart 1 m along the floor. How much work is done, in joules?
9. 9.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
12. 12.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the fulcrum (d) the effort
13. 13.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
14. 14.🏋️ A smooth ramp is 15 m long and rises 3 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) time taken (d) colour of bar
16. 16.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
17. 17.Which of these is an inclined plane? (a) a seesaw (b) the tip of a nail (c) a bottle cap (d) a wheelchair ramp
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
19. 19.True or false: a tug of war is a push. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
22. 22.🪝 What does a single fixed pulley change? (a) the size of the load (b) gravity (c) the colour of rope (d) the direction of pull
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
25. 25.🏋️ A 6 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.⚖️ A seesaw balances. Ravi (360 N) sits ? m from the pivot on one side; Kabir (120 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
27. 27.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
28. 28.⚙️ Which simple machine is the tip of a nail? (a) screw (b) inclined plane (c) wedge (d) pulley
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
30. 30.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
31. 31.🪝 A well winch has a handle (wheel) of radius 18 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
32. 32.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
33. 33.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) balanced (d) unbalanced
34. 34.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) stop all friction (d) make new energy
35. 35.🪝 A bucket weighing 350 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
36. 36.True or false: closing a drawer is a push. (a) False (b) True
37. 37.⚖️ A lever bar balances. The load is 490 N at 10 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?
38. 38.🏋️ A machine lifts a load of 240 N when you push with 80 N. What is its mechanical advantage (MA)?
39. 39.⚖️ A lever bar balances. The load is 1000 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.⚙️ Which simple machine is a door stopper? (a) pulley (b) screw (c) lever (d) wedge

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