TOLONG BANTU, BESOK DIKUMPULKAN
Answer (4)
Class I . . . The fulcrum is between the effort and the load. The mechanical advantage may be any positive number, more or less than ' 1 '.
Class II . . . The load is between the fulcrum and the effort. The mechanical advantage is always greater than ' 1 '.
Class III . . . The effort is between the fulcrum and the load. The mechanical advantage is always less than ' 1 '.
Comparison of Lever Classes
The three classes of levers are categorized based on the relative positions of the load, effort, and fulcrum. A lever is essentially a rigid bar that rotates around a fixed point, known as the fulcrum, using an applied force called the effort to move a resistance or load.
First Class Levers
First class levers have the fulcrum located between the effort and the load. They can provide either a mechanical advantage or increase the range of motion, depending on whether the effort arm or load arm is longer. Real-world examples include seesaws and scissors.
Second Class Levers
In second class levers, the load is positioned between the fulcrum and the effort, which always allows a smaller effort to move a larger load. These levers typically provide a mechanical advantage greater than one. A common example of a second-class lever is a wheelbarrow.
Third Class Levers
Third class levers have the effort placed between the load and the fulcrum. These levers tend to increase the range of motion but do not usually provide a mechanical advantage, as the effort arm is usually shorter than the load arm. Human arms acting as levers during bicep curls are an example of third class levers in the body.
All lever classes have their own advantages and disadvantages in terms of mechanical advantage and range of motion. While second class levers are efficient for lifting heavy loads with less effort, first and third class levers are more about balancing forces or increasing speed and the range of movement at the expense of the force needed.
Levers are categorized into three classes based on the positions of the fulcrum, effort, and load. First-class levers have the fulcrum in the middle, second-class levers have the load in the middle, and third-class levers have the effort in the middle. Each class has unique advantages, affecting how force is applied and load is moved.
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4). Untuk membuktikan kebenaran persamaan [tex]S = v_{o}t + \frac{1}{2}at^{2}[/tex] menggunakan analisis dimensi, kita perlu menunjukkan bahwa dimensi ruas kiri (S) sama dengan dimensi ruas kanan [tex](v_{o}t + \frac{1}{2}at^{2})[/tex]. - Ruas Kiri:- S adalah perpindahan atau jarak, yang memiliki dimensi panjang [L].- Ruas Kanan:- [tex]v_{o}t[/tex] memiliki dimensi kecepatan dikali waktu. Kecepatan memiliki dimensi [L][T]⁻¹ dan waktu memiliki dimensi [T]. Jadi, dimensi [tex]v_{o}t[/tex] adalah:[L][T]⁻¹[T] = [L]- [tex]\frac{1}{2}at^{2}[/tex] memiliki dimensi percepatan dikali waktu kuadrat. Percepatan memiliki dimensi [L][T]⁻² dan waktu kuadrat memiliki dimensi [T]². Jadi, dimensi [tex]\frac{1}{2}at^{2}[/tex] adalah:[L][T]⁻²[T]² = [L] Karena kedua suku di ruas kanan memiliki dimensi yang sama, yaitu [L], maka penjumlahan keduanya juga akan memiliki dimensi [L]. Konstanta [tex]\frac{1}{2}[/tex] tidak memiliki dimensi.Kesimpulan:Karena dimensi ruas kiri sama dengan dimensi ruas kanan, maka persamaan [tex]S = v_{o}t + \frac{1}{2}at^{2}[/tex] secara dimensional benar.5).a. Momentum = massa x velocity• Dimension of massa (m) = M• Dimension of velocity (v) = Length/Time = L/T = LT⁻¹• Dimension of momentum = M x LT⁻¹ = MLT⁻¹ b. Impuls = force x time• Dimension of force (F) = massa x acceleration = M x (L/T²) = MLT⁻²• Dimension of time (t) = T• Dimension of impuls = MLT⁻² x T = MLT⁻¹ c. Kinetic Energy = (Ek = 1/2 x mv²) with m = mass, v = speed• Dimension of massa (m) = M• Dimension of velocity (v) = LT⁻¹• Dimension of v² = (LT⁻¹)² = L²T⁻²• Kinetic Energy = 1/2 x M x L²T⁻² = ML²T⁻²
