K.E = P²/2m sp p = √2mk Increase in K.E. = 300% of k = 3k Final K.E., k ′ = k + 3k = 4k Final momentum, p′= √2mk = √(2m X 4k) = √(2&2mk) = 2p % Increase in momentum = p' - p/p X 100 = 100%
K.E = P²/2m sp p = √2mk
Increase in K.E. = 300% of k = 3k
Final K.E., k ′ = k + 3k = 4k
Final momentum, p′= √2mk = √(2m X 4k) = √(2&2mk)
= 2p
% Increase in momentum = p’ – p/p X 100 = 100%
Define spring constant of a spring.
It is the restoring force set up in a string per unit extension.
It is the restoring force set up in a string per unit extension.
See lessA body is moving at constant speed over a frictionless surface. What is the work done by the weight of the body?
W = 0.
W = 0.
See lessWhat happens to the P.E. of a bubble when it rises in water?
Decreases.
Decreases.
See lessName a process in which momentum changes but K.E. does not.
Uniform circular motion
Uniform circular motion
See lessDoes the P.E. of a spring decreases or increases when it is compressed or stretched?
Increases because W.D. on it when it is compressed or stretched.
Increases because W.D. on it when it is compressed or stretched.
See lessA light and a heavy body have same K.E., which of the two have more momentum and why?
Heavier body.
Heavier body.
See lessK.E. of a body is increased by 300 %. Find the % increase in its momentum?
K.E = P²/2m sp p = √2mk Increase in K.E. = 300% of k = 3k Final K.E., k ′ = k + 3k = 4k Final momentum, p′= √2mk = √(2m X 4k) = √(2&2mk) = 2p % Increase in momentum = p' - p/p X 100 = 100%
K.E = P²/2m sp p = √2mk
See lessIncrease in K.E. = 300% of k = 3k
Final K.E., k ′ = k + 3k = 4k
Final momentum, p′= √2mk = √(2m X 4k) = √(2&2mk)
= 2p
% Increase in momentum = p’ – p/p X 100 = 100%
How will the momentum of a body changes if its K.E. is doubled?
Momentum becomes √2 times.
Momentum becomes √2 times.
See lessState the two conditions under which a force does no work?
(i) Displacement is zero or it is perpendicular to force. (ii) Conservative force moves a body over a closed path.
(i) Displacement is zero or it is perpendicular to force.
(ii) Conservative force moves a body over a closed path.
See lessTwo bodies stick together after collision. What type of collision is in between these two bodies?
Inelastic collision.
Inelastic collision.
See less