Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

EK Physics 4

momentum, machines, radioactive decay

QuestionAnswer
momentum measure of a moving object's tendency to continue along its present path; always conserved in isolated system; is a vector
momentum equals p = mv
elastic collision collisions where mechanical energy is conserved
inelastic collision when colliding objects lose some of their mechanical energy to internal energy
impulse change in momentum (J), shows that if time over which force is increased, the same change in velocity can be achieve w/ lower force
impulse eqn J = delta(p) = Favg*delta(t) where t is time
machines mechanical devices that reduce force when doing work, ex: ramp. lever, and pulley
ramp inclined plane, reduces force required to move object to height of h bc force req'd is only mgsin(theta) as opposed to mg
lever based on principle of torque where increasing lever arm reduces force req'd
pulley allow force to act over greater distance and do the same amt of work **remember that T is the same at every pt in the rope
half life length of time necessary for 1/2 of a given amount of a substance to decay
alpha decay helium nucleus (2 protons + 2 neutrons)
beta decay expulsion of electron
positron emission emission of positron (proton transformed into neutron)
electron capture capture of electron along with merging of e' with proton to create a neutron
gamma ray high frequency photon, no charge and does not change identity of atom of which it is given off
rest mass energy E = m*c^2 = latent energy w/in mass of object
mass defect the difference in masses of the nucleons before forming the nucleus and the measured mass of the nucleus - this mass is plugged into E=mc^2 to find binding energy
fusion combining of two nuclei to for single heavier nucleus
fission splitting of single nucleus to form 2 lighter nuclei
Created by: miniangel918
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards