General Physics 1 Final Exam Flashcards
an object is moving in the negative direction and has a negative acceleration.
the velocity of the object is __________.
negative
an object is moving in the negative direction and has a negative acceleration.
the speed of the object is __________.
increasing
an object is moving in the positive direction and has a negative acceleration.
the velocity of the object is __________.
positive
an object is moving in the positive direction and has a negative acceleration.
the speed of the object is ___________.
decreasing
true or false: no net forces are acting on the car during interval B
true
true or false: net forces act on the car during intervals A and B
true
the magnitude of the net force acting during internal A is ___ during C
greater than
true or false: opposing forces act on the car during interval B
true
true or false: opposing forces act on the car during interval C
true
while suspended in space, an astronaut pushes on a more massive spacecraft.
a. both the spacecraft and astronaut accelerate away with very different accelerations
b. both the spacecraft and the astronaut accelerate away with very similar accelerations
c. only the astronaut accelerates
d. only the spacecraft accelerates
a. both the spacecraft and astronaut accelerate away with very different accelerations
a stone is thrown horizontally off a cliff and hits the ground below. a 2nd stone is dropped from rest off the same cliff, falls from the same height, and hits the ground below.
the displacement of the stones are _________.
different
a stone is thrown horizontally off a cliff and hits the ground below. a 2nd stone is dropped from rest off the same cliff, falls from the same height, and hits the ground below.
the time of flight for the 2 stones are ___________.
the same
a stone is thrown horizontally off a cliff and hits the ground below. a 2nd stone is dropped from rest off the same cliff, falls from the same height, and hits the ground below.
the speed just before impact to the ground are __________.
different
one person throws a baseball up in the air while a second person drops the baseball.
the magnitude of acceleration of the first baseball will be __________ the second baseball.
the same as
one person throws a baseball up in the air while a second person drops the baseball.
the direction of acceleration of the first baseball will be in the __________ direction while the direction of the acceleration of the second baseball will be in the _________ direction.
negative
negative
an object is moving at a constant velocity in the positive x direction.
what cannot be true and why?
a. no forces act on the object in the x direction
b. one force acts on the object in the positive x direction
c. one force acts on the object in the negative x direction
d. 2 forces act on the object in the x direction
e. 3 forces act on the object in the x direction
b. one force acts on the object in the positive x direction - the object would be speeding up
c. one force acts on the object in the negative x direction - the object would be slowing down
in state equilibrium, a block has a weight 10N. in situation a, a force of 7N is applied downward. in situation b, a tension of 2N is applied upward.
what is the magnitude of the normal force the surface applies back on the block in situation a?
17N
in state equilibrium, a block has a weight 10N. in situation a, a force of 7N is applied downward. in situation b, a tension of 2N is applied upward.
what is the magnitude of the normal force the surface applies back on the block in situation b?
8N
in state equilibrium, a block has a weight 10N. in situation a, a force of 7N is applied downward. in situation b, a tension of 2N is applied upward.
if a third force was applied in the x direction, would situation a or b result in a lower force of friction and why?
b would have a lower force of friction because it has a smaller normal force F=µFn
what max height will be reached by an arrow launched straight upward with an initial speed of Vi=35m/s?
63m
a rock is thrown at an angle 30° with an initial speed of 15m/s.
as the rock approaches the highest point, its speed __________.
decreases
a rock is thrown at an angle 30° with an initial speed of 15m/s.
as the rock moves up, the acceleration will point __________.
down
a rock is thrown at an angle 30° with an initial speed of 15m/s.
what is the vertical component of velocity (Vy) when the rock reaches its max height?
0m/s
a rock is thrown at an angle 30° with an initial speed of 15m/s.
what is the horizontal component of velocity (Vx) when the rock reaches its max height?
13m/s
a bobsled track contains 2 turns with radii 33m and 24m and the speed is maintained at 34m/s.
the __________ turn will have a greater centripetal acceleration. explain:
second
ac=v^2/r, so when the same velocity is divided by a smaller radius, the value of the acceleration will be larger
a bobsled track contains 2 turns with radii 33m and 24m and the speed is maintained at 34m/s.
the magnitude of centripetal acceleration of the first turn is:
35m/s
a bobsled track contains 2 turns with radii 33m and 24m and the speed is maintained at 34m/s.
the centripetal acceleration experienced by the bobsled during a banked turn is because of:
FN | FNx | FNy | fk | fkx | fky | Fg | Fgx | Fgy
FNx
fkx
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
true or false: both points have the same centripetal acceleration
false
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
true or false: both points have the same tangential acceleration
false
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
true or false: the angular velocity at point B is greater than at point A
false
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
true or false: both points have the same angular velocity
true
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
true or false: point A turns through a greater angle than point B
false
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
the angular acceleration applied to the disk is in the __________ direction
counter-clockwise
a disk rotates and begins to slow down from 90rad/s clockwise to 30rad/s through an angle of 180rad. point A is on the rim and B is half way to the center.
the magnitude of angular acceleration is:
20rad/s^2
a box is being pulled by a rope across a rough level surface.
what are the conservative forces:
tension
gravity
normal force
friction
none
gravity
a box is being pulled by a rope across a rough level surface.
what are the non-conservative forces:
tension
gravity
normal force
friction
none
tension
normal force
friction
a box is being pulled by a rope across a rough level surface.
what are the forces that do positive work on the box?
tension
gravity
normal force
friction
none
tension
a box is being pulled by a rope across a rough level surface.
what are the forces that do negative work on the box?
tension
gravity
normal force
friction
none
friction
a box is being pulled by a rope across a rough level surface.
what are the forces that do no work on the box?
tension
gravity
normal force
friction
none
gravity
normal force
the total mechanical energy will only be conserved when:
the net work done by nonconservative forces is zero
linear momentum is conserved when the system is __________ and __________ is equal to zero and when ___________ is equal to zero
isolated
external forces
acceleration
a bowling ball and ping-pong ball are rolling towards you with the same momentum and you exert the same force to stop each of them.
it takes ___________ time to stop the bowling ball relative to the ping-pong ball
the same
a 1.0kg ball has a speed of 12m/s downward just before it strikes the ground and bounces up with a velocity of 12m/s upward. what is the change in momentum of the ball?
∆p=pf-pi
0 kg m/s
a 2kg box is sitting at rest when a 20N force is applied. the box immediately starts to move to the right 5m. the force of kinematic friction is 10N.
the work done by the 20N force is ___________ (positive, negative, or zero)
positive
a 2kg box is sitting at rest when a 20N force is applied. the box immediately starts to move to the right 5m. the force of kinematic friction is 10N.
the work done by the kinematic friction is ___________ (positive, negative, or zero)
negative
a 2kg box is sitting at rest when a 20N force is applied. the box immediately starts to move to the right 5m. the force of kinematic friction is 10N.
the work done by the normal force is ___________ (positive, negative, or zero)
zero
a 2kg box is sitting at rest when a 20N force is applied. the box immediately starts to move to the right 5m. the force of kinematic friction is 10N.
what is the total work done on the box as it moves 5m?
36.6J
2 satellites are in orbit moving in a circular path, above Earth’s surface at r=4.23x10^7m. they have an angular separation of θ=2°.
what is the angular separation in radians?
2°=2π/360
0.0349rad
2 satellites are in orbit moving in a circular path, above Earth’s surface at r=4.23x10^7m. they have an angular separation of θ=2°.
the centripetal force(s) experienced by one of the satellites is/are:
fk | FG | Fsatellite + Fg | Fsatellite + FG
FG
2 satellites are in orbit moving in a circular path, above Earth’s surface at r=4.23x10^7m. they have an angular separation of θ=2°.
write an equation for the linear velocity on one of the satellites in terms of the centripetal forces
a ball has a mass of one milligram. to find the mass in grams, what conversion factor would you use?
1g/1000mg
the mathematical relationship between quantities is given as a=b^2/c. if the dimensions of b are [L]/[T] and c are [L], what are the dimensions of a?
[L]/[T]^2
the sides of a pool were measured to calculate an area of 16m^2. what values of width and length were used with proper sig figs?
a. w=8, l=2.0
b. w=4.01, l=4.0
c. w=4.001, l=4.00
d. w=3.20, l=5
c. w=4.001, l=4.00
an object is moving along a straight line and decelerating.
true or false: the value of acceleration is negative
true
an object is moving along a straight line and decelerating.
true or false: director of acceleration is the same direction of displacement
false
an object is moving along a straight line and decelerating.
true or false: the acceleration changes as the object moves along the line
false
an object is moving along a straight line and decelerating.
true or false: the direction of the acceleration is opposite the direction of the velocity
true
an object is moving along a straight line and decelerating.
true or false: an object that is decorating has a negative acceleration
false
a car is moving west wit a speed of 11m/s. 3 seconds later, the car is still moving west but the speed is reduced to 5.0m/s. what is the acceleration?
2m/s^2 east
if the equation x=Vot + 1/2at^2 is used, we can assume
a. a is constant
b. t is constant
c. v is constant
d. Vo and t are constant
a. a is constant
2 objects A and B accelerate from rest with he same constant acceleration. object A accelerates for twice as much time as object B.
true or false: object A travels twice as far as object B
false