3) Is total mechanical energy conserved if friction is present when doing work. If the change...
under what conditions is mechanical energy conserved? only when conservative forces are present Only when the net talk on a system is zero only when the net force on the system is zero mechanical Everly is always conserved
Is the total mechanical engergy conserved or does it change with time and whyy?
Ignoring friction, the total energy of the skater is conserved. This means that the kinetic plus potential energy at one location, say E1=K1+U1, must be equal to the kinetic plus potential energy at a different location, say E2=K2+U2. This is the principle of conservation of energy and can be expressed as E1=E2. Since the energy is conserved, the change in the kinetic energy is equal to the negative of the change in the potential energy: K2❝K1=❝(U2❝U1), or ΝK1=❝ΝU2. Select the...
1.Linear momentum is always conserved [ ]when kinetic energy is conserved [ ]when total energy is conserved [ ]in the absence of internal forces [ ]in the absence of external forces 2. If two objects collide and there are no other forces acting on them, the momentum of each object will be independently conserved. [ ]True [ ]False 3.The momentum of an object is equal to the product of it mass and ______ [ ]Velocity [ ]Speed [ ]displacement [...
1. How do you use the Conservation of Mechanical Energy idea in a system when friction force is neglected? 2. How can you determine the Mechanical Energy change of a system when friction force is considered?
Do not use energy conservation.
Because of friction, energy isn't conserved.
2. A bowling ball is thrown down an alley with initial velocity vo and no rotation around its center of mass. The ball is thrown in such a way that it initially slides before beginning to roll. The ball has mass m, coefficient of static friction Hls, and coefficient of sliding friction plk. Show that the velocity of the ball when it begins to roll without slipping is vo....
" Heat in = Mechanical work + Internal Energy Change" for a system is expressed by : a. 3rd law of thermodynamics b. 2ndlaw of thermodynamics c. Law of Entrophy d. 1st law of thermodynamics
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Quiz#4 Name: 1). Energy is defined as an ability of doing work a) True b) False c) Can's say 2). 1 Jule of energy corresponds to the work done a) 1 Nm b) 3 Nm c) 5 Nm 3). According to physics, does the earth do any work on moon a) No c) Can't say b) Yes 4). When we drop an object from a maximum height, initial kinetic energy is zero a) True b) False c) Undetermined...
The object below, with mass M is pulled in the horizontal
direction over a flat surface for a distance d, whose coefficient
of friction is uk.
2. The object below, with mass Mis pulled in the horizontal direction over a flat surface for a distance d, whose coefficient offriction is HK a. (5 points What is the total work done by friction? b. (5 points What is the change in thermal energy? 3. (5 points If both conservative forces and...
When a magnet is dropped through the copper pipe, why does it fall slower than the aluminum pellet? Is energy conserved when magnet falls? If not, where does the missing (or gained) energy go (or come from). How would this be different if the pipe was made of PVC?