Physics Practice: Simple Machines (Mock Test 3 - Advanced)
1. Why is a screw considered more efficient than a nail for holding pieces of wood together?
2. How does a single fixed pulley help if it does not increase the mechanical advantage ($MA = 1$)?
3. In a Class III lever, why is the Mechanical Advantage always less than 1?
4. Which of these explains why a long handle on a spanner makes it easier to loosen a tight nut?
5. What is the relationship between the slope of an inclined plane and the effort required?
6. A machine has a Load of $100 \text{ N}$ and an Effort of $25 \text{ N}$. Its Mechanical Advantage is:
7. Why can a machine never have 100% efficiency in real-world conditions?
8. In a Class II lever like a wheelbarrow, the M.A. is always greater than 1 because:
9. Which mechanism is used in a "Winding Staircase" to save effort?
10. A wedge works by changing the direction of the input force from ________ to ________.
11. If the Velocity Ratio ($VR$) of a machine is 5 and its $MA$ is 4, its efficiency is:
12. A knife is a more effective wedge if its blade is:
13. The main difference between a Class I and Class II lever is:
14. To increase the $MA$ of a wheel and axle, one should:
15. Why do we apply oil to the moving parts of a machine?
16. A complex machine is different from a simple machine because it:
17. In a pulley system, if there are 4 pulleys, the theoretical Mechanical Advantage is:
18. The "Work Input" of a machine is the work done ________.
19. Which lever class is used when we lift a weight with our forearm (Elbow is fulcrum)?
20. The pitch of a screw is $1 \text{ mm}$. If it is turned 10 times, it will move into the wood by:
