Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

OAT- Physics > Work, Energy, Power and Momentum > Flashcards

Work, Energy, Power and Momentum Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

When looking at change in momentum problems

A

Pay attention to the direction of velocity

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

If work is performed by a net force

A

W= ΔKE

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

Formula for weight

A

W = mg

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

Formula for Potential Energy

A

PE = mgh

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

When approaching an elevator problem where you’d feel lighter

A

Subtract acceleration to gravity

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

Hooke’s Law

A

F = -kx

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

Formula for force of gravity

A

Fg = F (m1m2/r^2)

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

Which situations should be treated as elastic collisions

A

If objects bounce off each other during collisions

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

Static Friction

A

Object is not moving

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

What kind of work is done when an object moves up

A

Negative, against gravity

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

Newton’s second law

A

Sum of the forces always equals m*a

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

Elastic Potential Energy Formula

A

P.E.e = 1/2kx^2

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

Formula for Work

A

W=Fdcosθ

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

Units for Work

A

J/Kgm/Kgm^2/s^2

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

Impulse

A

The product of the force and the time for which the force is applied

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

What kind of work is done when holding stationary objects?

A

No work is done when holding stationary objects. Without displacement work done is zero

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

Both masses united by one rope will have the same acceleration and tension

A

Find out which force wins and calculate the acceleration using their combined masses.

This does not work for tension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Elastic Collisions

A

Both the momentum and the kinetic energy are conserved.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Inellastic Collisions

A

Total kinetic energy of the system is not conserved

20
Q

When friction is ignored the total mechanical energy in a system

A

Remiains the same

21
Q

What is the relationship between mass and velocity

A

The speed of a falling object is not dependent upon its mass. We don’t need to know the mass to determine the final velocity

22
Q

Formula’s for Impulse

A

FΔt = Δp or FΔt = mΔv or FΔt = m(vf – vi)

23
Q

How does the momentum of an object change

A

Anytime its velocity or mass changes

24
Q

Formula’s for Power

A

P= (W/t) = (fd/t) = fv

25
Q

Linear momentum

A

p=mv

26
Q

Conservation of Momentum general formula for two objects

A

m1v1i + m2v2i = m1v1f + m2v2f

27
Q

Newton’s third law

A

For every force exerted by one bisect on a second object, there is an equal but opposite force by the second object

28
Q

What happens to the Normal force when you press down on an object

A

It increases since there is more friction

29
Q

Newton’s first law

A

An object’s velocity remains constant unless a force is acting upon it

If the sum of the forces equals zero then velocity is constant

30
Q

Mechanical Energy is conserved if

A

No work is done by no conservative force (friction, air resistance, etc.)

31
Q

Formula for Mechanical Energy

A

E = KE + PE

32
Q

If work is performed by none conservative forces

A

Wnc = ΔE

33
Q

For questions that ask you to calculate the change in momentum of a single object, where the mass of the object does not change use

A

Δp = pf – pi = mvf – mvi = m(vf – vi)

34
Q

Centripital force formula

A

Fc = (mv^2/r) = mac

35
Q

Formula for Gravitational Potential Energy

A

P.E. = mgh

36
Q

When on a horizontal plane the normal force and weight will

A

Equal each other.

Not the case on an incline plane

37
Q

Because mechanical energy in a system is conserved in problems where you are given a few known variables

A

You can set P.E. = K.E.

38
Q

Mechanical Energy

A

The sum of the kinetic energy and all forms of potential energy in the system

39
Q

Formula for Kinetic Energy

A

KE = 1/2(mv^2)

40
Q

When apporaching an elevator problem where you’d feel heavier

A

Add acceleration to gravity

41
Q

Which situations should be treated as inellastic collisions

A

Objects remain in contact after the collision

42
Q

Centripial acceleration formula

A

ac = (v^2/r)

43
Q

What relationship does the force an object experiences have towards the time that force acts

A

It’s inversely proportional.

i.e. That means that if it takes longer for an object to come to a stop, it will experience a smaller instantaneous force

44
Q

Formula for force of friction

A

Ff = μN

45
Q

Kinetic Friction

A

Object is sliding accross the surface

OAT- Physics (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions