a) name some advantages of moving an object up a ramp instead of lifting it vertically upwardb) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically

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a) name some advantages of moving an object up a ramp instead of lifting it vertically upwardb) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically

a) name some advantages of moving an object up a ramp instead of lifting it vertically upwardb) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically
a) name some advantages of moving an object up a ramp instead of lifting it vertically upward
b) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically upward

a) name some advantages of moving an object up a ramp instead of lifting it vertically upwardb) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically
a)The most important advantage is that we can use a smaller force to move it by a ramp than to lift it vertically.(最重要的优点在于利用斜坡我们可以用更小的力.)
b)The most important disadvantage is that we need more energy to finish the entire process.Because the friction consumes more energy.（最重要的缺点在于利用斜坡耗费了更多的能量来完成整个过程.因为摩擦力消耗了更多的能量）

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