Question

A block slides down a ramp with friction. The friction experienced by the block is 21 N. The mass of the block is 8 kg. The ramp is 6 meters long (meaning, the block slides across 6 meters of ramp with friction). The block is originally 2 meters vertically above the ground (the bottom of the ramp). What is the change in energy of the block due to friction, expressed in Joules

Answer 1

Complete Question

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Answer:

the change in energy of the block due to friction is
`E = -126 \ J`

Step-by-step explanation:

From the question we are told that

The frictional force is
`F_f = 21 \ N`

The mass of the block is
`m_b = 8 \ kg`

The length of the ramp is
`l = 6 \ m`

The height of the block is
`h = 2 \ m`

The change in energy of the block due to friction is mathematically represented as

`\Delta E = - F_s * l`

The negative sign is to show that the frictional force is acting against the direction of the block movement

Now substituting values

`\Delta E = -(21)* 6`

`\Delta E = -126 \ J`