ap physics final

two blocks with the mass 1.0 kg and 2.0 kg are pushed with a constant applied force across a frictionless table with constant acceleration such that blocks remain in contact. the 1 kg pushes the 2 kg block with a force of 2 N. The acceleration of the two blocks is

1.0 m/s/s

force exerted on 5kg block across rough surface. magnitude is initially 5N with constant velo, while block is moving force instantly reaches 12 N. how much kinetic energy does it gain when moving for 2m

14 J

125 N board weight is supported by 4 m chain length ion each side. person weighting 500 N sits. right chain has 250 N. what left chain?

375 N

block on a horizontal negligible friction ideal spring. spring compressed x amd released from rest. energy of k1. when compressed double the amount the energy us

4k1

rock on a string swings a vertical circle. which digram shows all of the forces acting on the rock when at 3 o'clock position

90° angle lines pointed at 9 and 6 o'clock

a student uses both hands and pushes a door opens such that it moves and swings after force has been applied. student claims to be able to push a force onto their own body and make them fall backwards. which justifies the claim

THE CLAIM IS NOT CORRECT, the body will exert a force EQUAL AND OPPOSITE ON THE HANDS DUE TO NEWTONS 3 rd law

in which of the following cases is kinetic energy decreasing.

a baseball heading up after being thrown up at an angle

planet travels in elliptical orbit around its star. which arrow best shows direction of the net force exerted on the planet

c

which of the following graphs could represent the vertical component of velo as a func of time for the dart and the target immediately after the dart is launched and target falls.

dart decrease above x axis target decreases blow x axis

child slides down slides A and B. height and friction of the slides are the same. which compares the change in delta k in the kinetic energy of the child and the change in delta U in the potential energy of the child earth system

delta Ka > delta Kb; delta Ua= deltaUb

sled slides down hill with negligible air resistance. which is correct about the sled earth system?

sum of gravitational potential energy and kinetic potential energy changes by an amount equal to the friction dissipated.

student swings a ball string length of R in vertical circle. ball moves minimum speed to complete circular path at point 1. what is true about the mechanical energy of the system.

system is OPEN because there is a NET FORCE.

student predicts that block sliding down ramp at 45° have a acceleration of 7m/s/s. block released and student measures distance traveled and time it takes to travel. student determines block acceleration is actually 5.5. which of the following is most likely the reason for the dif between predictions and calculated acceleration.

the student model used to make the prediction did not account for all of the forces that are exerted on the block

box A of mass m sits in the floor of an elavator, with box b of mass 2m on top of it. as shown above. elavator moving upward and slowly down. Fa is the magnitude of the force exerted on box A by box b, Fb is the magnitude exerted on box b by box a and fg is the magnitude of gravity exerted on box b. which of the following ranks the forces inorder of magnitude?

(fb=fa) < fg

which of the following correctly ranks the displacement (triangle) x for the three segments of motion

(triangle) X3> triangle X2> triangle X1>0

a block mass m1 collides with a block of mass m2 such that m1 becomes at rest and m2 slides across the surface until it reaches the frictional surface. the coefficient of friction between m2 and surface is uk. What is the rate of change of the speed of the center of mass of the two block system after m2 enters frictional surface

(ukm2g)/ (m1+m2)

an object is released from rest near a planets surface. a graph of the acceleration as a function of time for the object is shown for the 4 s after the object is released. the positive direction is considered to be upward. what is the displacement of the object after 2s

-10 m

an object is sliding to the right along a straight line on a horizontal surface. the graphs shows the object velo as a function of time. what is the objects displacement during the time depicted in the graph

0 m

rubber ball weighing .20 kg dropped from 1.5 above the ground. ball bounces on floor, .6 j oenergy dissipated. max height of the ball?

1.2 m

.5 kg object is in free fall down near the surface if the planet. a v/t graph is shown. what is the force due to gravity.

1.25 N

a ball is with an initial speed of 20m/s at an angle of 60 to the ground. if air resistance is negligible, what is the balls speed at the instant it reaches the maximum height from the ground

10 m/s

the figure above shows the forces exerted on a block that is sliding on a horizontal surface. gravitational force is 40 N and normal force is 40 N. friction force exerted to the left. coefficient of friction between block and surface is .20. the acceleration is most nearly

2.0 meter per sec squared TO THE LEFT

a 100kg cart goes around the inside of the vertical loop of a roller coaster. the radius of the loop is 3m and the cart moves at a speed of 6m/s at the top. the force exerted by the track on the cart at the top of the loop is

200 N

if a 2kg object initially at rest is slide across rough surface under influence of the 4 forces above. what is speed at 3 sec.

36 m/s

constant force of 900 N pushes up an 100kg object up incline at a constant speed of 4m/s. power is ?

3600 Watts

student rides bicycle at a constant speed in a circle. what us the acceleration based on the force diagram above.

5m/s/s

What percent of engery of the apple earth system was dissipated?

60%

table shows experimental of magnitude of 4 forces exerted on 2 kg object as it slides across horizontal surface. which of the following can show magnitude of bet forces.

6N and 10 N

a block of mass 2kg slides along a horizontal tabletop. horizontal applied force is 12 N and vertical applied force is 15 N on the block. coefficient between block ans table is .2 the fricton exerted on the block is most nearly.

7N

car speed of v and car 2 speed of 2v both travel same circular unbanked road. if the frictional force to keep the faster car on the road is F then the friction force to keep the slower one on the road is

F/4

astronaut with mass Ma in a satellite that orbits earth at height H above surface. earth has a mass Mg and the radius is Rg. correct expressionfor the gravitational force exerted on the astronaut by the earth

Fg= G((MgMa)/(Rg+H)^2

Two objects, X and Y, accelerate from rest with the same constant acceleration Object X accelerates for twice the time as object Y. Which of the following is true of these objects at the end of their respective periods of acceleration?

Object X has traveled four times as far as object Y

force diagram above shows box accelerating to the right on a horizontal surface negligible friction. Tension exerted at angle of 30° above horizontal. if uis coefficient of friction, which of the following is correct equation derived from newtons second law to the box

a= (Tcos(theta)-u(Mg-Tsin(theta)))/M

balls 1 and 2 are each thrown horizontally from the same height above level ground, but ball two has a greater initial after leaving the throwers hand. if air resistance is negligible, how do the acceleration of the balls and the time it takes for them to reach the ground compare

acceleration is = and time is =

object 1 and object 2 travel across a horizontal surface and their horizontal velo as a func of time is shown in the graph. which of the following statements is correct about the two object system.

after 2 sec object 1 travels GREATER distance then object 2 travels

if the string was cut and object Y is released from rest while object x was held at rest, which of the following claims is correct about the new acceleration of the center if mass of system anew compred to the orginal acell of the center of mass of the system aorginal

anew will be less then aoriginal

an object begins at a position x=0 and moves one dimensionally along the x axis with a velo v expressed as a function of time t, according to the graph above. at what time does the object pass through x= 0 again?

between 20 and 30 seconds

three identical blocks each take a dofferent path from height h to the ground. block a falls vertically, b slides down incline, c threw horizontal. which takes the longest to reach ground

block b, one sliding down

block slides down 38° incline that is .8 meters long. v/t graph. how could student use graph to determine if the block earth system is opened or closed

determine final kinetic energy and compare it to initial grav potential energy of the system above

what position yield the most total mechanical energy on the cart-cart earth system

energy of ferris wheel ride is constant.

person holds 4kg object over uncompressed spring that has a constant of 500 N/m. gently lowers from point a to point b. which is the correct change in energy on system

energy of the system doesnt change

block compressed spring travels distance of d. which correctly considers the energy of the system.

energy on the block doesnt change energy of the block and the earth increases by more than zero but less than 1/2kx

after both balls have traveled half of their vertical distance to the floor, what is the acceleration of the center of mass of the two ball system relative to earth

equal to g. gravity

student makes the measurements to create the graph shown which represents the vertical velo of the dart and target from 0 to the instant they meet. at t=0 the the target is h above the dart. the curves have the same are between them and the axis and same slope. which is the best method to determine distance h from the ground.

find twice the area under the curve for the data chart

stick used to hit a ball. which of the following pairs of force represents action reaction pair and object or objects involved.

fstick and f ball

student is asked to determine work done on a block the block of wood when the block is pulled horizontal to an attached string. supplied with spring scale stopwatch and meterstick. which determines work done of the block by the sting.

graph FORCE X DISTANCE AND FIND AREA UNDER THE CURVE

2kg object released from rest near surface and graph of gravitational potential energy is shown. what is a graph of kinetic potential

increases exponentially

block slides to the right on a rough horizontal surface. force exerted on the block are shown above. which of the following statements about the friction force on the block is true?

it is the sum of all the microscopic forces between the bottom of the block and the surface.

two blocks of masses m and M are suspended as shown above by strings of negligible mass. if a person holding the upper string lowers the blocks so that they have a constant downward acceleration a, the tension in the string at point p is

m(g-a)

block a hangs from a a light string that passes over a pully and is attached to block b. which is on a level frictionless table. students are to determine the mass of block b from the two block system after it is released from rest. plan to measure the time it takes for block a to reach the floor. what other measurement must the student take to determine the mass of block b.

mass of block a and the distance block a goes down

spring is attacked to a object mass of m, m is released from rest and the displacement of the spring is x

mgxsin(theta)

ball mass of m attached to a vertical rod by two mass less strings. both strings taut, with tensions T1 and T2. string forms the right triangle and ball rotates horizontal circle with radius R and speed v. magnitude of net force on the ball. what is T1 in the upper string?

mv^2/r mgcos(theta)

student asked to move box from ground to loading platform. which does more work? pushing up incline or lifting onto dock.

neither method because the work done is the same in both cases

blue sphere and red sphere same diameter released from top of the ramp. red sphere takes a longer time to reach bottom of the ramp. spheres then rolled off table with same time, speed and free fall to the floor. which lands first.

neither, land at the same time

spacecrafts traveling from earth to moon. which is true of the gravitational force from the two object on the ship when it is equal distance from earth and moon.

net force because force of the earth is larger than force of the moon

as the moon orbits the planet from position a to b is the magnitude of the planets force due to gravity constant.

no because distance between planet and moon is always changing

a ball is thrown straight up in the air. when the ball reaches its highest point which of the following is true

none of the above

a student is provided a battery operated car that manufacturer claims travels at a constant speed. student has to test the validity. which of the following tools can help select two.

photogates placed beginning middle and end/ meter stick to measure distance traveled

student need to design an experiment to determine gravitational mass of an object

place object on one side of a lever at a known distance of the fulcrum. place know masses on the other side of fulcrum. move known masses known distance until fulcrum reaches static equilibrium/// place object on the end of hanging spring with known spring constant. allow to stretch at a new position until it reaches original position

a motion sensor is used to create the graph of a student horizontal velo as a function of time as the student moves toward and away from the sensor as shown above. the positive direction is shown as the way away from the sensor. which of the following describes the students final position xf in relation to the starting position xo and the students average horizontal acceleration ax between 0-3 secs?

position xf IS FARTHER THEN xo and ax IS POSITIVE

student wants to study motion of an object with a constant acceleration. which of the following situation best illustrates an object with a constant acceleration

release ball from rest near earth surface/ release cart from rest at 40° with respect to the ground

truck pulling three crates on a rough surface. which of the following shows the forces of crate 2?

rope, crate three and friction pulling left, cable pullong right

object A is released from rest at height h. at the same instance. object b is thrown downward from the same location. what of the following v/t graphs is correct for the two objects

same slope, b starts higher

student must design an experiment to determine relationship between mass and acceleration when under influence of a net force. which experiment?

slide an object with a known mass across the rough surface, using a constant applied force. place a motion detector behind the object such that speed can be measured as it slides. REPEAT EXPERIMENT WITH DIFFERENT APPLIED FORCES

during part of the motion above the work is negative. what feature of motion indicates this

speed is decreasing or acceleration is negative

a ball is released straight up and returns to the point from which it was launched. if the ball is subject to air resistance and gravity which is true

speed of the ball to the point of launch is less than the speed it was initially launched

an object undergoes an acceleration as it travels a straight horizontal section of track. which of the following graphs could represent that motion?

speed/time starting halfway up y axis positive slope// position/ time squared positive slope starting at y axis

two blocks are connected by a rope. masses are 5kg for top and 10 kg for the bottom. force is upward. force up scissors cute the rope. how does the 10 kg rope immediately reply.

the block continues to move upward then accelerates downward

crate on a horizontal frictionless surface with F exerted on crate at an angle causing it to be slid right. surface exerts Nf on crate. f constant angle doubled how does delta k compare

the new gain is less then delta k

spacecraft in orbit around plant with mass 6.4x10^23 and they orbit 4.5x10^7 m above planet surface. what else need to be calculated.

the planets radius only

how does the magnitude of the force exerted by the top block compare to the magnitude of the bottom block

the two magnitudes are always equal in each of the stacks

althlete running v mass is m grabs a rope H and swings to h1. athlete two has rope of H/2 and mass of 2M running v and grabs the rope and swings. to h2. how do the heights compare?

the two reach THE SAME HEIGHT, because VELO SAME

applied forces on 5kg object across frictional surface. graph of net work is shown. how can student use graph to determine bet work done on the object.

there is not enough info that is known or can be obtained from the graph

person holds book at rest above table. lowers it at a slow constant speed onto the table.which describes the total energy on the energy book system.

total mechanical energy decreases due to the person doing NEGATIVE work

a student preforms a experiment in which the horizontal position of a toy car is recorded on ticker tape from a device that places dots on the tape at equal time intervals. the series of dots in the figure represents the motion of an object moving from the negative direction to the positive direction along the horizontal direction. the time interval between dots is 1s. which of the following expeirments could the student have conducted to create the data shown on the ticker tape

toy car initially INCREASES SPEED, travels at a CONSTANT SPEED, then DECREASES SPEED

what is the velocity of the center of mass of the spheres in the frame of reference of the train and in the frame of reference of a person standing at rest along side the train. (train cart with two balls)

train= zero person= vt east

A person throws a marble straight up into the air, releasing it a short height above the ground and catching it at that same height. Which of the following position y vs time t graphs is correct for the motion of the marble?

upside down u

two students want to determine the speed at which a ball is released when thrown vertically upward into the air. one student throws the ball into the air while the other student measures the total time that the ball is in the air. the students use a meter stick to measure the release height of the ball. which of the following equations should the student use to determine the speed at which the ball was released.

y=Yo+Vyot+1/2Ayt^2 FROM RELEASE UNTIL IT HITS THE GROUND