Have you ever wondered how your bones and muscles work together to create movement? The answer lies in levers! This video from School of PE dives into the fascinating world of levers and how they play a crucial role in your body's mechanics.
Levers are essentially rigid bars that rotate around a fixed point called the fulcrum. Imagine your bones as the levers and your joints as the fulcrums. Muscles contract to apply force on these levers, allowing you to move. The amount of resistance you encounter can vary depending on the situation, from lifting a lightweight object to pushing against a heavy door.
Further, the video explores the three types of levers:
• First-class levers: Here, the fulcrum is located in the middle, with the force applied on one side and the resistance on the other. Think of a seesaw – the center support is the fulcrum, your weight on one end is the force, and your friend's weight on the other end is the resistance.
• Second-class levers: In this type, the resistance is placed between the fulcrum and the force. A good example is a wheelbarrow – the wheel acts as the fulcrum, the weight you are carrying is the resistance close to the fulcrum, and your hands applying force on the handles are further away.
• Third-class levers: These levers have resistance on the opposite side of the fulcrum from the force. Your elbows are a prime example – the fulcrum is the hinge joint in your elbow, the force is applied by your biceps muscle, and the resistance is the object you're holding in your hand.
Finally, the instructor touches upon the concept of mechanical advantage. This refers to the ratio between the resistance you're overcoming and the force you're exerting. Levers can provide a mechanical advantage, allowing you to move heavier objects or exert greater force than you could with your muscles alone.
Like this sample lecture? Enroll in School of PE's PE Environmental prep course to gain access to recorded lecture videos and all essential study materials. Register today to pass the PE exam on your first try.
For more information visit: https://www.schoolofpe.com/pe-environmental
Levers are essentially rigid bars that rotate around a fixed point called the fulcrum. Imagine your bones as the levers and your joints as the fulcrums. Muscles contract to apply force on these levers, allowing you to move. The amount of resistance you encounter can vary depending on the situation, from lifting a lightweight object to pushing against a heavy door.
Further, the video explores the three types of levers:
• First-class levers: Here, the fulcrum is located in the middle, with the force applied on one side and the resistance on the other. Think of a seesaw – the center support is the fulcrum, your weight on one end is the force, and your friend's weight on the other end is the resistance.
• Second-class levers: In this type, the resistance is placed between the fulcrum and the force. A good example is a wheelbarrow – the wheel acts as the fulcrum, the weight you are carrying is the resistance close to the fulcrum, and your hands applying force on the handles are further away.
• Third-class levers: These levers have resistance on the opposite side of the fulcrum from the force. Your elbows are a prime example – the fulcrum is the hinge joint in your elbow, the force is applied by your biceps muscle, and the resistance is the object you're holding in your hand.
Finally, the instructor touches upon the concept of mechanical advantage. This refers to the ratio between the resistance you're overcoming and the force you're exerting. Levers can provide a mechanical advantage, allowing you to move heavier objects or exert greater force than you could with your muscles alone.
Like this sample lecture? Enroll in School of PE's PE Environmental prep course to gain access to recorded lecture videos and all essential study materials. Register today to pass the PE exam on your first try.
For more information visit: https://www.schoolofpe.com/pe-environmental
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