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Physics > Work and Enerygy > Flashcards

Work and Enerygy Flashcards

1
Q

Is defined as the product of the force component that is parallel to an object’s motion and the distance that the object is moved

A

Work

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2
Q

Is done by a force on a system

A

Mechanical work

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3
Q

Work is a scalar and can be positive, negative, or zero

True or False

A

True

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4
Q

The SI unit of work and energy is

A

Joule (J)

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5
Q

For mechanical work the units __ may be used

A

N*M

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6
Q

Any kind of force cannot do work

True or False

A

False

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7
Q

Not every force on an object will do work

True or False

A

True

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8
Q

A force-distance graph is not helpful for a varying force

True or False

A

False

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9
Q

The proportionality constant k is called

A

spring constant

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10
Q

Work done on a spring by an external force is always positive

True or False

A

True

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11
Q

Ideal strings have mass and the value of k for the spring is not constant throughout its range of displacement

A

False

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12
Q

Any force that is proportional to the displacement of a system from an equilibrium position is called

A

Hooke’s Law force

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13
Q

The spring force is opposite to the direction of displacements from its equilibrium position caused by an external force

True or False

A

True

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14
Q

The time rate of work done on a system by a force

A

Power

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15
Q

The rate at which a force does work at any instant

A

Instantaneous Power

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16
Q

Power is a vector quantity that is proportional to the force acting on a system and speed of a system

A

False

17
Q

The SI unit of power

A

Watt (W)

18
Q

The mechanical energy associated with motion

A

Kinetic Energy

19
Q

States that the total work done on a system by all external forces acting on it is equal to the change in the system’s kinetic energy

A

Work-Energy Theorem

20
Q

All work changes kinetic energy

A

False

21
Q

Is energy due to an object’s condition or position relative to some reference point assumed to have zero potential energy

A

Potential Energy

22
Q

The SI unit of Kinetic and Potential Energy

A

Joule (J)

23
Q

Only forces that are conservative forces have their own potential energy

True or False

A

True

24
Q

Can store work energy as some form of mechanical potential energy

A

Conservative forces

25
Q

Which is not an example of conservative forces

The gravitation force
any central force
any Hooke’s law force
fluid drag

A

Fluid drag

26
Q

Convert work energy into mechanical unstable forms of energy

A

Non-conservative forces

27
Q

Which is not an example of non-conservative forces

kinetic frictional force
internal resistance
fluid drag
the gravitational force

A

the gravitational force

28
Q

The work required to move these masses apart against the force of gravity is equal to their

A

gravitational potential energy

29
Q

The work of one force on a system often causes a change in potential energy with respect to another force also acting on a system

True or False

A

True

30
Q

Its potential energy per kilogram at a specified distance r from a zero reference distance

A

gravitational potential

31
Q

Gravitational potential energy is negative for any measurable separation distance

True or False

A

True

32
Q

Can be produced with respect to spring-like (elastic) forces, which are conservative forces

A

Elastic potential energy

33
Q

The work by ___ on a system is equal to the change of the sum of kinetic and potential energies of the system

A

Nonconservative forces

34
Q

Is the sum of a system’s kinetic and potential energies:

A

Total mechanical energies (E)

35
Q

The work accomplished by all nonconservative forces on a system during a certain process is equal to the change of total mechanical energy of a system

True or False

A

True

36
Q

When only conservative forces are acting on a system, the increase of kinetic energy is equal to the loss of mechanical potential energy and vise versa. This is the principle of

A

Conservation of mechanical energy

Physics (6 decks)

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