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30 Cards in this Set
- Front
- Back
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Momentum is calculated as ____ x ______
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mass x velocity
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A unit for momentum is ....
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kg m/s
(kilogram meter per second) |
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A unit for momentum other than kg m/s is ....
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N.s (Newton-second)
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An object with 0 m/s velocity has ___ momentum
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No (O kg m/s)
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Which has more momentum, a large truck moving at 20 miles per hour or a small car moving at 30 miles per hour?
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the large truck
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Which has more momentum -- a car going 30 mph or an identical carmoving at 60 mph?
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60 mph car
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If the momentum of an object changes and the mass stays the same, then what must be happening?
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the velocity of the object is changing
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A rifle is fired. Compared to the impulse on the ball, the amount of impulse on the gun is...
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the same
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When two or more objects collide, the momentum before the collision must be equal to the ____ after the collision.
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momentum
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When two people on ice skates are facing each other standing still, their momentum is ____. Then, after pushing away from each other, their combined momentum is ___ as they move away.
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zero
zero (One has negative momentum and the other has positive momentum.) |
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Impulse is another word for the ____ of _____.
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change of momentum
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The letter for momentum in a formula is....
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p
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When there is a change in velocity, then there is also a change in ____ also known as an ____.
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momentum
impulse |
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The symbol for impulse is....
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delta p
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Impulse is equal to ___ x ____ or ___ x ___
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Force x change in time (F delta t)
mass x change in velocity (m delta v) |
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Airbags in cars protect you. They do this by reducing the ___ on you by increasing the ____ that it takes for you to move forward. The amount of ___ is not changed.
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force
time impulse |
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In a baseball pitch and catch. Who exerts the greater impulse, the pitcher or the catcher?
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neither one
The impulse stays the same. |
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In a baseball pitch and catch. Who exert the greater force on the ball, the pitcher or the catcher?
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catcher. He/she catches it in much less time then the pitcher pitches it.
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An ice skater in a spin has the ____ momentum after she comes out of the spin.
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same
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When an ice skater has arms and legs close to the trunk, overall radius is small, then he is spinning (how?)
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fast
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Slow spins by ice skaters are associated with ____ radii.
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large
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A collision in which objects move away in directions that are not 180 degrees apart are ___ _____ collisions.
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2-dimensional
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Train cars colliding on train tracks are colliding in ___ dimension.
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one
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When one car hits another car, causing car A to move left and car B to move right, then the vector addition of the momenta of A & B after the collsion must be ____ to the momentum before the collision.
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equal
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How many units of impulse are involved in catching a ball?
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one
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How many units of impulse are involved in throwing a ball?
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one
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How many units of impulse ae involved in a ball bouncing off a surface? (stopping and throwing back)
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two
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What crash would be more damaging in a car -- hitting and sliding with other car or hitting and bouncing back from other car?
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bouncing back -- has twice as much impulse
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Suppose a problem indicates that the velocity goes the other direction -- west instead of east or left instead of right -- what do you have to do to the velocity in the problem?
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Make it negative
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How is change in velocity calculated?
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Final velocity - initial velocity
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