Hi, I was wondering if anyone could please help me understand when is there no work in Joules being produced when your object is moving at a constant velocity. Example #1: Brenda carries a 5.0 kg suitcase as she walks m along a horizontal walkway to her room at a constant speed of 6.5 m/s. How much work does Brenda do in carrying her case? Example #2: A force of magnitude 55N directed at an angle of 37 degrees above the horizontal moves a 30kg crate along a horizontal surface at constant velocity. How much work is done by this force in moving the crate a distance of 15m? W=F*d F=ma For example #1 Brenda should be doing zero work due to the fact that there is no acceleration involved. Therefore, the force would be zero since acceleration is needed to create force (F=ma). Example #2, would the work produced equal 55cos 37 degrees times 15 meters? or would it be zero work since no acceleration?