Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 345 · 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.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
2. 2.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
3. 3.True or false: pushing a swing is a push. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🪝 A well winch has a handle (wheel) of radius 7 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
6. 6.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
7. 7.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
10. 10.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.🏋️ A force of 430 N pushes a cart 3 m along the floor. How much work is done, in joules?
12. 12.🏋️ A force of 40 N pushes a cart 7 m along the floor. How much work is done, in joules?
13. 13.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
14. 14.Which of these is an inclined plane? (a) a claw hammer on a nail (b) a bottle cap (c) a jar lid (d) a wheelchair ramp
15. 15.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
17. 17.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
18. 18.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 100 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
20. 20.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the load (d) the effort
21. 21.True or false: a wheelchair ramp is a pulley. (a) False (b) True
22. 22.True or false: a seesaw is a screw. (a) False (b) True
23. 23.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
24. 24.True or false: a fixed pulley only changes direction. (a) False (b) True
25. 25.💪 A cart is pulled to the right with 90 N and to the left with 105 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
26. 26.🏋️ A force of 240 N pushes a cart 1 m along the floor. How much work is done, in joules?
27. 27.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
28. 28.Which of these is caused by muscular force? (a) a compass needle turns (b) rain falls to the ground (c) an apple falls down (d) lifting a school bag
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.True or false: a chisel is a wedge. (a) True (b) False
31. 31.💪 Two children push a box to the right, one with 85 N and the other with 30 N. What is the net (total) force on the box, in newtons?
32. 32.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) True (b) False
33. 33.🏋️ A machine lifts a load of 500 N when you push with 100 N. What is its mechanical advantage (MA)?
34. 34.True or false: an axe blade is a screw. (a) True (b) False
35. 35.🏋️ An 18 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
36. 36.Which of these is caused by muscular force? (a) a thrown ball comes down (b) rubbing hands warms them (c) pedalling a cycle (d) an apple falls down
37. 37.💪 Two children push a box to the right, one with 60 N and the other with 75 N. What is the net (total) force on the box, in newtons?
38. 38.🏋️ A smooth ramp is 6 m long and rises 2 m. What effort pushes a 450 N box up it, in newtons? (ideal ramp, no friction)
39. 39.💪 A box weighs 390 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1

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