The mechanical energy of an object must change if: The object's kinetic energy is changing There...
The mechanical energy of an object must change if:
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The object's kinetic energy is changing |
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There is a net non-conservative force acting on the object over some distance |
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More than one non-conservative forces are acting on the object |
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All forces acting on the object are conservative |
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The kinetic and potential energies of the object are changing in opposite ways |
Homework Answers
There is a net non-conservative force acting on the object over some distance
A good example is, when kinetic friction acts on a body for some distance the kinetic energy of the body decreases. so, mechanical energy is decreased.
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The mechanical energy of an object must change
if:
The object's kinetic energy is changing
There...
The object below, with mass M is pulled in the horizontal direction over a flat surface...
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...
A) Give a general expression for the work done by two forces acting on an object...
A) Give a general expression for the work done by two forces acting on an object (F1 and F2 vectors) as it moves along a trajectory. F1 is conservative, and F2 is dissipative. Your expression should include terms of kinetic and potential energies, if any, indexed during the forces. B) Define the Total Mechanical Energy C) How does it change?
The potential energy of an object decreases by 10J. What is the change in the object's...
The potential energy of an object decreases by 10J. What is the change in the object's kinetic energy, assuming there is no friction in the system?
In travelling a distance of 0.5m, an object gained 200 Joules of kinetic energy. What work...
In travelling a distance of 0.5m, an object gained 200 Joules of kinetic energy. What work was done on the object, assuming no frictional forces acted? What was the average forces acting on the object? If a force of 600N had acted over the same distance, what would have been the gain in kinetic energy?
The work-energy theorem applies to changes in kinetic energy because.... a- forces applied over a distance...
The work-energy theorem applies to changes in kinetic energy because.... a- forces applied over a distance change the position, therefore the object has some velocity, which implies kinetic energy. b- forces applied over a distance change the position, therefore the object has some acceleration, which implies kinetic energy. c- forces are a part of kinetic energy. d- forces applied over a distance change nothing about the system so we have to study kinetic energy.
1) Which term best describes an object's resistance to a change in motion A) Force B)...
1) Which term best describes an object's resistance to a change in motion A) Force B) Inertia C) Acceleration D) Resistance 2) Two skaters, Cathy and Mike, are standing on a frozen pond. Mike has twice the mass as Cathy. If Mike pushes to the left on Cathy, what can be said about the forces and accelerations on each person? A) Cathy experiences a force and acceleration to the left, while Mike experiences an equal force in the opposite direction....
The mechanical energy of a system is conserved when a.There is no net external force acting...
The mechanical energy of a system is conserved when a.There is no net external force acting on the system b.The objects in the system are undergoing an elastic collision c.No non-conservative forces do work on the system. d.Both B and C. e.Both A and B.
The energy of motion is called: Kinetic energy. potential energy, inertial energy. Power. In an inelastic...
The energy of motion is called: Kinetic energy. potential energy, inertial energy. Power. In an inelastic collision: momentum is conserved. kinetic energy is conserved, both (a) and (b). If the velocity of a moving object is doubled and its mass is cut in half, the kinetic energy of the object is; remains the same, doubled quadrupled, cut in half. When the net work done on an object is speed of the object is me on an object is zero; the...
When we consider a moving body in mechanical equilibrium, which of the following must be true?...
When we consider a moving body in mechanical equilibrium, which of the following must be true? (There may be more than one answer.) The object's linear speed is a constant. If the object is rotating, it must be rotating about an external, fixed point. The object's direction is not changing. If the object is rotating, its rotational speed must be constant.
From the Work/Energy theorem, the change in kinetic energy of an object ("particle") is equal to...
From the Work/Energy theorem, the change in kinetic energy of an object ("particle") is equal to t work done on the object by all external forces: Assuming that the cart starts from rest, (w 0). find an equation for the speed of the cart v as as function of the net work on the cart W and cart mass M. (Note: requires Adobe Flash Player.) Which of the curves on the graph at left could represent the Velocity of the...
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...
1) Which term best describes an object's resistance to a change in motion A) Force B) Inertia C) Acceleration D) Resistance 2) Two skaters, Cathy and Mike, are standing on a frozen pond. Mike has twice the mass as Cathy. If Mike pushes to the left on Cathy, what can be said about the forces and accelerations on each person? A) Cathy experiences a force and acceleration to the left, while Mike experiences an equal force in the opposite direction....
The energy of motion is called: Kinetic energy. potential energy, inertial energy. Power. In an inelastic collision: momentum is conserved. kinetic energy is conserved, both (a) and (b). If the velocity of a moving object is doubled and its mass is cut in half, the kinetic energy of the object is; remains the same, doubled quadrupled, cut in half. When the net work done on an object is speed of the object is me on an object is zero; the...
From the Work/Energy theorem, the change in kinetic energy of an object ("particle") is equal to t work done on the object by all external forces: Assuming that the cart starts from rest, (w 0). find an equation for the speed of the cart v as as function of the net work on the cart W and cart mass M. (Note: requires Adobe Flash Player.) Which of the curves on the graph at left could represent the Velocity of the...
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