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Physics - Chapter 6
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Gravity
Terms in this set (27)
momentum
defined as mass times velocity
- is represented by the symbol "p" and is a vector quantity
p = mass x velocity
what is the formula for finding momentum
zero
what will the mometum be when the velocity of an object that is not moving is zero
yes
is momentum a vector quantity
has both magnitude + direction
why is momentum a vector quantity
kg*m/s
what is the SI units of momentum
the object with twice the mass has twice the momentum
two objects are moving at the same velocity. the first object has twice the mass of the second object. compare their momentum.
the object moving at twice the velocity has twice the momentum
two objects that have the same mass are moving at different velocities. the first object is moving at twice the velocity of the second object. compare their momentum
by changing either the magnitude or the direction (or both) of the momentum
how can a change in momentum of an object occur
impulse
the product of the force and the time over which the force acts on an object
change in momentum
the impulse experienced by an object is equivalent to the object's....
force (F) for time interval
what formula represents impulse
impulse-momentum theorem
states that when a net force is applied to an object over a certain time interval, the force will cause a change in the object's momentum
F*change in T = change in momentum = mvf-mvi
what is the formula for impulse-momentum theorem
a body's change in momentum
what is impulse equivalent
law of conservation of momentum
the total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects
m1v1i + m2v2i = m1v1f + m2v2f
what is the formula of the conservation of momentum
elastic collision
inelastic collision
2 types of collisions are
elastic collision
a collision in which the total momentum and the total kinetic energy are conserved
- objects stay separated after collision
-momentum is conserved
-kinetic energy is conserved
- in some collisions, two objects collide and then move apart separately
- ex: player kicks a soccer ball downfield, player swings a golf club and hits a golf ball, billiard ball hit another while someone is playing pool
inelastic collision
a collision in which two objects stick together after colliding and move together as one mass
- objects stick together after collision
- momentum is conserved
-kinetic energy IS NOT conserved
-in some collisions, two objects collide and stick together to that they travel together after the impact
-ex: collision b/w two football players after a tackle, meteorite collides w/ Earth and becomes buried in earth's crust, two cars collide and then stick together as they move
kinetic energy
the energy of an object that is due to the object's motion
-units: Joules (J)
- depends on speed + mass
Joules (J)
what is the units for kinetic energy
speed + mass
what does kinetic energy depend on
1/2mv2
what formula is used when finding kinetic energy
as mass increases kinetic energy increases
as velocity increases kinetic energy increases
what is the relationship between mass + velocity between kinetic energy
1/2m1v1i2 + 1/2m2v2i2 = 1/2m1v1f2 + 1/2m2v2f2
what formula is used when solving for elastic collisions
m1v1i + m2v2i = (m1 + m2)vf
what formula is used when solving for inelastic collisions
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