CHAPTER TEST A. Identify what concept or item is described. 1. The measure of how effective a machine is 2. Which of the load and effort should be located farther from the fulcrum to ma 3. A doorknob is an example of what simple machine? 4. A pulley is more efficient if it has more of this. 5. The steeper the ramp, the force will be and the distance traveled wi 6. The the fan wedge, the greater the force. 7. A wheel and axle is more effective if there is a greater 8. For a screw, the more threads along its length, the it is to remove o 9. If two gears are to rotate in the same direction, should they be put side by si by some distance and connected using a chain? 10. Blender has two simples machines in call it as a B. Put a check \( \checkmark \) if the given is a safety practice with machines and cross \( x \) if it is 11. running down on a ramp 12. wearing a long scarf while fixing gears 13. checking the rope and pulley before using them 14. using a tool larger than your own hands 15. learning how to use the changeable gears in the bike C. Write one safety precuation when using the following machines. 16. knife 17. bicycle 18. scissors 19. escalator
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1. The measure of how effective a machine is refers to its **mechanical advantage** or **efficiency**, indicating how well it converts input force to output work. 2. In terms of load and effort in a lever, the **effort** should be located farther from the **fulcrum** to maximize the mechanical advantage and make lifting easier. 3. A doorknob is an example of a **wheel and axle**, which allows the user to easily rotate and open the door with minimal effort. 4. A pulley is more efficient if it has more **support ropes** or **sheaves**; this reduces the load you need to lift, making it easier to do so. 5. The steeper the ramp, the **greater the force** required, and the **shorter** the distance traveled will be, as an incline increases the effort needed to reach the desired height. 6. The **larger** the fan wedge, the greater the force it can exert, as it moves more air with a wider angle, allowing efficient airflow. 7. A wheel and axle is more effective if there is a greater **radius**, as this means more mechanical advantage when turning the axle. 8. For a screw, the more threads along its length, the **easier** it is to remove or insert, as it provides better grip and stability in the material. 9. If two gears are to rotate in the same direction, they should be placed **side by side** and connected using a chain; this allows them to work synchronously without changing their direction. 10. A blender has two simple machines in it called a **gear system and a motor**, which together facilitate efficient mixing and blending of ingredients. 11. \( x \) - Running down a ramp could lead to falls and injuries, so it’s important to always walk carefully and avoid running. 12. \( x \) - Wearing a long scarf while fixing gears is unsafe as it can get caught, leading to serious accidents or injuries. 13. \( \checkmark \) - Checking the rope and pulley before using them is a good safety practice to ensure they are in good condition and will work as intended. 14. \( x \) - Using a tool larger than your own hands can be dangerous, as it may lead to loss of control and increase the risk of injury. 15. \( \checkmark \) - Learning how to use the changeable gears in the bike is vital for safe riding and helps in better handling of different terrains. 16. Always use a knife with a stable cutting surface and cut away from your body to prevent accidents. 17. Always wear a helmet when riding a bicycle to protect your head in case of falls or accidents. 18. Use scissors with your thumb in the top hole and fingers in the bottom hole, keeping the blades pointed away from yourself when handling. 19. Stand still and hold the handrails when using an escalator to prevent falls.
