Physics 11

A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done.

I've already answered & gotten this question correct, however it made me confused about the concept.

I found Ek. & Ek to find change in Ek which was 3479.85. He did work against both friction & inertia & yet this one formula covered both & I didn't have to add anything together. Why not? As far as I understood, to get Work total you need to do the formula for each work (friction & inertia) then add.

Thank you!! ☺

  1. 👍
  2. 👎
  3. 👁
  1. No, the work done was the difference in kinetic energies, assuming the work to overcome friction at each speed was constant.

    1. 👍
    2. 👎
  2. So does that mean if I have work against friction & acceleration I can use that one formula to cover both? :)

    1. 👍
    2. 👎
  3. Yes, if the friction involved in attaining different speeds was the real life, it is not. Friction of air is dependent on velocity squared as a rule of thumb.

    1. 👍
    2. 👎
  4. Ok, that's super helpful thank you very much!! :)

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics -- check answers please

    1. A boy pushes a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10N of force as the car rolls forward 3.0m, the amount of work done by the boy is: a)-30 b)0

  2. trigonometry

    The sprockets and chain of a bicycle are shown in the figure. The pedal sprocket has a radius of 4 in., the wheel sprocket a radius of 2 in., and the wheel a radius of 13 in. The cyclist pedals at 45 rpm. (a) Find the angular

  3. physics

    A 50.0kg cyclist on a 10.0kg bicycle speeds up from 5.0m/s to 10.0m/s , the total kinetic energy before acceleratingis 750, and after acceleratingis 3000, how much work is done to increase the kinetic energy of the cyclist and the

  4. Physics

    A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. Not sure how to start ! Do I calculate the difference or what and which formula

  1. Math

    A bicycle with 18-in.-diameter wheels has its gears set so that the chain has a 6-in. radius on the front sprocket and 3-in. radius on the rear sprocket. The cyclist pedals at 195 rpm. Find the linear speed of the bicycle in

  2. Physics

    A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 55.0 kg, and the hill is inclined at 16.0° with respect to the horizontal. Air resistance opposes the motion of the cyclist.

  3. engineering mathematics

    A cyclist of mass 60kg rides a bicycle of mass 20kg. When starting off, the cyclist provides a force of 200N. What is his acceleration?

  4. math

    cyclist rides her bike at a speed of 27 kilometers per hour. What is this speed in meters per second? How many meters will the cyclist travel in 10 seconds? Do not round your answers.

  1. physics

    the speed of a cyclist reduces uniformly from 2.5 m/s to 1.0 m/s in 12 s. (a) calculate the deceleration of the cyclist. (b) calculate the distance travelled by the cyclist in this time

  2. math

    A cyclist rides his bike at a speed of 27 miles per hour. What is this speed in feet per second? How many feet will the cyclist travel in 2seconds? In your computations, use the fact that 1 mile is equal to 5280 feet. Do not round

  3. Physics

    The leader of a bicycle race is traveling with a constant velocity of +11.9 m/s and is 10.7 m ahead of the second-place cyclist. The second-place cyclist has a velocity of +9.10 m/s and an acceleration of +1.20 m/s2. How much time

  4. physics

    With an average acceleration of −1.6 m/s^2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop? Answer in units of s

You can view more similar questions or ask a new question.