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Physics Test Review !!
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Terms in this set (15)
Elastic Collisions:
When a moving object makes a head-on collision with another object at rest, the moving object becomes at rest and the other object moves with the speed of the colliding object
When a moving billiard ball collides head-on with a ball at rest, What happens?
The first ball comes to rest and the second ball moves away with a velocity equal to the initial velocity of the first ball
what is transferred from the first ball to the second ball?
Momentum
When objects collide without being permanently deformed and without generating heat, what is the collision called?
An elastic collision
Colliding objects bounce perfectly in what?
perfect elastic collisions
The sum of the what is the same before and after each collision?
momentum vectors
What happens after an elastic collision?
the balls have different velocities
Elastic Equation:
m1 v1 + m2 v2 = m1 (m1-) + m2 (v2-)
Inelastic Collisions :
A collision in which the colliding objects become distorted and generate heat during the collision (both masses stick together creating one mass)
What holds true even in inelastic collisions?
Momentum Conservation
Whenever colliding objects become tangled or couple together, what occurs?
A totally inelastic collision
Inelastic Equation:
m1 v1 + m2 v2 = (m1 + m2) v-
Momentum Vectors:
...
What is conserved even when interacting objects don't move along the same straight line?
Momentum
Momentum is a what?
Vector Quantity
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Verified questions
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A 1.5 V battery moves 2000 C of charge around a circuit. By how much does the chemical energy of the battery decrease?
PHYSICS
A sports car (and its occupants) of mass M is moving over the rounded top of a hill of radius R. At the instant when the car is at the very top of the hill, the car has a speed v. You can safely neglect air resistance (a) Taking the sports car as the system of interest, what object(s) exert nonnegligible forces on this system?
PHYSICS
We saw that a runner's Achilles tendon will stretch like a spring and then rebound, storing and returning energy during a step. We can model this as the simple harmonic motion of a mass-spring system. When the foot rolls forward, the tendon spring begins to stretch as the weight moves to the ball of the foot, transforming kinetic energy into elastic potential energy. This is the first phase of an oscillation. The spring then rebounds, converting potential energy to kinetic energy as the foot lifts off the ground. The oscillation is fast: Sprinters running a short race keep each foot in contact with the ground for about 0.10 second, and some of that time corresponds to the heel strike and subsequent rolling forward of the foot. If, during a stride, the stretch causes her center of mass to lower by 10 mm, what is the stored energy? A. 3.0 J B. 6.0 J C. 9.0 J D. 12 J
PHYSICS
An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 5.6 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 50° north of due east. (a) How far and (b) in what direction must he now travel to reach base camp?