Energy and Momentum Flashcards

1
Q

Work is responsible for the

A

Changing energy of an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Impulse is responsible for the

A

Changing momentum of an object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Work is the measure of

A

Transferred mechanical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the unit for Work?

A

Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the equation for Work?

A

W = Fdcos0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Work is 0 when the force is

A

Perpendicular to motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Work is negative when the force is

A

Opposite of the motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the unit of Power?

A

Watts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the equation of Power?

A

P = W / t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Kinetic energy and potential energy are forms of

A

Mechanical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Mechanical energy is conserved when

A

Total energy is constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Mechanical energy is not conserved with

A

Friction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The sum of Energy (E) =

A

K + U

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The work-energy theorem states that the work performed by all the forces acting in a certain time interval result in the

A

Change in Kinetic Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the equation for the work-energy theorem?

A

W = ∆K = Kf - Ki

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Conserved forces have associated

A

Potential energies

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How is the force when the work required to move a particle in a round-trip is 0?

A

It is conservative

18
Q

How is the force when the work required to move a particle between two points is the same, regardless of path?

A

Also conservative

19
Q

Gravity is a

A

Conservative force

20
Q

Nonconservative forces cause for energy to be

A

Transferred into another form

21
Q

What are examples of nonconservative forces?

A
  • Friction
  • Air resistance
  • Viscosity
22
Q

Conservation of energy is when the total mechanical energy is

23
Q

Constant mechanical energy is caused when

A
  • Work by nonconservative forces = 0

- There are no nonconservative forces

24
Q

What equations display constant total mechanical energy?

A
  • E = K + U = constant

- ∆E + ∆K + ∆U = 0

25
What is the equation used for nonconservative systems?
W' = ∆E = ∆K + ∆U
26
Nonconservative systems are when there is
Friction or air resistance present
27
Pulleys lift heavy weights with
Smaller forces over long distances
28
The load of the pulley is the
Weight, or the ∑Tensions in rope
29
The effort of the pulley is the
Force exerted when lifting
30
Efficiency is the
Measure of the amount of work put in and the work that comes out
31
What is the equation for efficiency?
Load * Load Dist / Effort * Effort Dist
32
What is the equation for momentum?
p = m * v
33
Impulse is the
Change in momentum
34
Impulse is measured in
Joules
35
Conservation of momentum is experiences when the
Net impulse of external forces on a system equals 0, making the total momentum constant
36
Conservation of momentum is automatic when there are
- No external forces | - ∑External forces = 0
37
For internal forces, how is momentum?
P initial = P final
38
What is the equation for a collision between two objects?
Pai + Pbi = Paf + Pbf
39
Completely inelastic collisions are ones in which
Colliding bodies stick after the collision
40
Completely inelastic collisions result in the
Combined mass of ma + mb
41
What is conserved in completely elastic collisions?
Both momentum and KE