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AP Physics 1 Chapter 7

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Section 1

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elastic

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Date created

Mar 1, 2020

Cards (30)

Section 1

(30 cards)

elastic

Front

two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. identify the type of collision.

Back

F(change in time)

Front

a force of constant magnitude F and fixed direction acts on an object of mass m that is initially at rest. if the force acts for a time interval T-To over a displacement X-Xo, what is the magnitude of the resultant change in the linear momentum of the object?

Back

less less

Front

Back

-8.0 kg*m/s

Front

a ball with a momentum of 4.0kg*m/s hits a wall and bounces straight back without losing any kinetic energy. what is the change in the ball's momentum?

Back

square root 2g(1-cos0)

Front

Back

1-cos0

Front

which of these following expressions could be used to find the increase in potential energy of the bullet/block system from impact to the angle=0 (theta)?

Back

2Vo

Front

one student predicts that the collision will be perfectly inelastic. what would be this student's predicted velocity of mass A after collision?

Back

the momenta of the two people are of equal magnitude

Front

two people of unequal mass are initially standing still on ice with negligible friction. they then simultaneously push each other horizontally. afterward, which of the following is true?

Back

was zero while stationary and increased when the person stood.

Front

a person sitting in a chair with wheels stands up, causing the chair to roll backwards across the floor. the momentum of the chair:

Back

their momenta are equal but opposite

Front

two skaters stand facing each other. one skater's mass is 60 kg, and the other's mass is 72 kg. if the skaters push away from each other without spinning,

Back

2mvcos0

Front

Back

5 N/s

Front

the slope of the "best fit" straight line is most nearly

Back

perfectly inelastic

Front

two objects stick together and move with a common velocity after colliding. identify the type of collision.

Back

1/7 m/s

Front

two bodies of masses 5 and 7 kilograms are initially at rest ona horizontal frictionless surface. a light spring is compressed between the bodies, which are held together by a thin thread. after the spring is released by burning through the thread, the 5 kilogram body has a speed of 0.2 m/s. the speed of the 7 kilogram body is:

Back

4mVo

Front

determine the total momentum of the system of the two objects

Back

20 N*s

Front

the impulse necessary to cause a change of momentum of 20kg*m/sec for a 5-kilogram object is:

Back

(mv)/(m+M)

Front

a railroad car of mass m is moving at speed v when it collides with a second railroad car of mass m which is at rest. the two cars lock together instantaneously and move along the track. what is the speed of the cars immediately after the collision?

Back

Vf

Front

an empty sled of mass M moves without friction across a frozen pond at speed Vo. two objects are dropped vertically into the sled one at a time: first ab object of mass m and then an object of mass 2m. afterward the sled moves with speed Vf. what would the final speed of the sled if the objects were dropped into in in reverse order?

Back

60N*s

Front

the increase in the momentum of the object between t=0 and t=4 is most nearly:

Back

4 m/s

Front

a railroad flatcar of mass 2000 kilograms rolls to the right at 5 meters per second and collides with a flatcar of mass 3000 kilograms that is rolling to the left at 10 meters per second. the flatcars couple together. their speed after the collision is

Back

decrease because of conservation of momentum

Front

an open cart on a level surface is rolling without frictional loss through a vertical downpour of rain, as shown above. as the cart rolls, an appreciable amount of rainwater accumulates in the cart. the speed of the cart will...

Back

it lengthens the stopping time of the stunt person and reduces the force applied during the landing

Front

how does an air mattress protect a stunt person landing on the ground after a stunt?

Back

300kg*m/s

Front

what is the momentum of a 30-kilogram cart moving at a speed of 10 meters per second?

Back

1 m/s

Front

a hunter uses a blowgun to hunt for supper. a force of 2.0 newtons is applied to a 0.5-kilogram dart for 0.25 seconds. the speed of the dart as it leaves the blowgun is about:

Back

(3/2) Vo

Front

during experimentation it is found that mass B moves with 2.5Vo. what would be this student's predicted velocity of mass A after collision?

Back

1 m/s

Front

a 2-kilogram piece of clay moving at 3 m/sec strikes and sticks to a second 2- kilogram piece of clay moving at 1 m/s in the opposite direction. calculate the speed of the combined piece of clay.

Back

(m+M)v/m

Front

which of these following expressions could be used to find the velocity of the bulletsystem prior to impact?

Back

inelastic

Front

after colliding, objects are deformed and lose some kinetic energy. identify the type of collision.

Back

20kg*m/s

Front

a 0.2 kg baseball is pitched with a velocity of 40 m/s and is the batten to the pitcher with a velocity of 60 m/s. what is the magnitude of change in the ball's momentum?

Back

2 N*s

Front

a ball of mass 0.4kg is initially at rest on the ground. it is kicked and leaves the kicker's foot with a speed of 5.0m/s in a direction 60 degrees above the horizontal. the magnitude of the impulse imparted by the ball to the foot is most nearly:

Back