State the Work-Energy theorem/equation (words and equations).

A spring has a natural length of 4 m. It requires 252 J of work to stretch the spring to 10 m. Calculate the work required to stretch the spring from 8 m to 9 m. Round your answer to the nearest hundredth if necessary. Provide your answer below: W = J

A box of mass 4.0 kg is accelerated from rest across a floor at a rate of 2.0 m/s^2 for 9.0 s . a.) Find the net work done on the box. Express your answer to two significant figures and include the appropriate units. W= ________

Consider the following physical situations. Identify the forces which do work upon the indicated object (in boldface type) and categorize them as conservative or non-conservative forces. Then indicate whether the total mechanical energy of the object changes; it it changes, then indicate whether the change is a positive or negative change. Finally, indicate whether the potential energy and the kinetic energy changes; if PE or KE changes, then indicate whether the change is a positive or negative change. Description of Physical Situation Identity of Forces Which Do Work: Change in TME Change in PE Change in KE Conserv. Non- Conserv. Yes (+ or -) No Yes (+ or -) No Yes (+ or -) No a. A force is applied to move a physics cart from the floor to the top of an inclined plane at a constant speed. _________ _________ _____ _____ _____ _____ _____ _____ b. A physics student scurries up a flight of stairs at constant speed. _________ _________ _____ _____ _____ _____ _____…

The brakes of a truck cause it to slow down by applying a retarding force of 7680 N to the truck over a distance of 760 m. What is the work done by this force on the truck? Number Units

3) The figure below illustrates a skier who is skiing on a large frictionless spherical ball of snow. The skier can be treated as a point-like object. The skier starts at the top of the ball with very little speed and picks up speed while traveling along the surface of the snow. During this time, the only forces acting on the skier are the gravitational force applied by the Earth and the normal force applied by the snow. At the moment the radial line extending from the skier to the center of the ball defines an angle a with respect to a vertical line, the skier is about to lose contact with the ball. Determine the value of a.

An object is initially moving at 2.0 m/s.  It is displaced 1.0 m down a rough incline in dynamic equilibrium by an applied force that is parallel to the horizontal (not the incline).   State whether the following works are positive, negative or zero and why. work of the applied force work of the normal force work of the weight work of friction net work

Indicate (with a T of F) whether the statement is true or false. If false, change the underlined word or phrase to make the statement true. A bicycle moving at 5.0 m/s at sea level has more potential energy than a motionless bicycle at the top of a mountain. Mechanical work is calculated by multiplying the magnitude of a force times the amount of time it is applied. The SI unit for work is the joule. One joule is equivalent to 1N: m in SI units 5 tv MacBook Pro

A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. During this process, what is the work done on the cabinet by the friction force, in Joule? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

Question 7: Indicate which of the forces do not perform work on the box and explain why: FBD KD WEIGHT PULLING FORCE mv FRICTIONAL FORCE NORMAL FORCE