Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 961 · 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 movable pulley only changes direction. (a) False (b) True
2. 2.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
3. 3.⚖️ 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
4. 4.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 500 N box up it, in newtons? (ideal ramp, no friction)
5. 5.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
6. 6.True or false: a movable pulley stays in one place. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
9. 9.⚖️ A seesaw balances. Asha (180 N) sits 2 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
12. 12.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
13. 13.💪 Two children push a box to the right, one with 30 N and the other with 70 N. What is the net (total) force on the box, in newtons?
14. 14.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) muscular force (c) magnetic force (d) friction
15. 15.💪 A box weighs 380 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the size of the load (c) the direction of pull (d) gravity
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🏋️ A machine lifts a load of 80 N when you push with 40 N. What is its mechanical advantage (MA)?
20. 20.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
21. 21.⚖️ A seesaw balances. Ravi (280 N) sits 2 m from the pivot on one side; Arjun (280 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
22. 22.🏋️ An 11 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) pulley (c) screw (d) lever
24. 24.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a well winch handle (d) a seesaw
25. 25.True or false: a round doorknob is a wheel and axle. (a) True (b) False
26. 26.Which of these is a wheel and axle? (a) a screw jack (b) a flagpole rope wheel (c) a water tap handle (d) a road up a hill
27. 27.🔍 Which is the odd one out? (a) a steering wheel (b) a well winch handle (c) a water tap handle (d) a wheelchair ramp
28. 28.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
29. 29.⚙️ Which simple machine is a well winch handle? (a) pulley (b) lever (c) wheel and axle (d) screw
30. 30.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
31. 31.🏋️ A force of 460 N pushes a cart 7 m along the floor. How much work is done, in joules?
32. 32.💪 A bag has a mass of 36 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🏋️ A force of 200 N pushes a cart 1 m along the floor. How much work is done, in joules?
34. 34.🏋️ A 10 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.🏋️ A force of 490 N did 4900 J of work. How many metres did the object move?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
37. 37.🏋️ Pushing a crate 6 m took 1260 J of work. What force was used, in newtons?
38. 38.True or false: a tug of war is a push. (a) True (b) False
39. 39.⚖️ A lever bar balances. The load is 350 N at ? cm from the fulcrum. The effort is 250 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.🏋️ A 19 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids