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physics test 1 Flashcards | StudBud
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physics test 1
physics test 1
84 terms
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Answers
1
energy of a body moving across a horizontal surface is an example of kinetic energy
True
False
2
motion in a circle at constant speed is motion with constant acceleration
true
false
3
you are presently exerting a gravitational force on the earth
True
False
4
momentum of an object never changes
False
True
5
roll a ball off table & at same time drop a second ball straight down from edge of table. the second ball reaches first
False
True
6
what does it mean for a physical quantity in a system to be conserved
its used in the most efficient manner possible
stays in original state forever
total amount of it in the system stays constant
none
7
what is the period of a signal that has a frequency of 60 Hz
60s-1
none
1/60 s
60s
8
caused by moons gravitational pull
ellipse
circle
simple harmonic motion
tides
9
momentum is conserved only when there is no friction
False
True
10
if an objects velocity is constant its speed must also be constant
true
false
11
kinetic energy is conserved in
elastic collison
any collision where two objects rebound off each other
none
inelastic collision
12
energy due to motion
work
internal energy
kinetic energy
13
in expressions like Δv and Δt, Δ stands for
change in
triangle
a variable
a constant of proportionally
14
the term velocity and speed have identical meanings in physics
false
true
15
a vector quanity has only a magnitude and no direction associated with it
true
false
16
when a body moves with uniform acceleration the net force on it is 0
False
True
17
force that keeps your feet from sliding as you walk
static friction
centripetal force
weight
kinetic friction
18
throw a ball straight up&peaks out then comes down during this motion the velocity&acceleration point in same direction
False
True
19
energy in the water at the top of a waterfall is an example of gravitational potential energy
False
True
20
the number of cycles of a periodic process that occur per unit time is called
wavelength
frequency
amplitude
period
21
if net force on an object is zero
there must be no forces acting on object
object must be at rest
objects acceleration must be zero
there can be no friction acting on object
22
the proper abbreviation for seconds is sec
false
true
23
kinetic energy is conserved in elastic collisions
True
False
24
keeps our feet from sliding as we walk
kinetic friction
circle
weight
static friction
25
kinetic energy
none
definitely not conserved
definitely conserved
may or may not be conserved depending on nature of collision
26
energy source for hydroelectric power station
work
gravitational potential energy
27
an example of an sction at a distance force is
kinetic friction
static friction
weight
tension
28
the time for one complete cycle of a periodic process to take place is called
wavelength
period
amplitude
frequency
29
needed to make an object move in a circle
ellipse
centripetal force
circle
field
30
object hanging from a spring can do this
weight
circle
simple harmonic motion
ellipse
31
force of the gravity acting on a body
weight
tides
circle
field
32
with a fixed force you will impact the same acceleration to a body on the earth and on the moon
True
False
33
centripetal force changes linear momentum but not angular momentum
True
False
34
all forces have specific directions associated with them
True
False
35
linear momentum
none
definitely not conserved
may or may not be conserved depending on nature of collison
definitely conserved
36
the slope of a distance vs time graph is the
velocity
acceleration
distance
none
37
the second is a metric unit of measure
false
true
38
shape of the path of a projectile
circle
ellipse
centripetal force
parabola
39
when a car goes around a curve of smaller and smaller radius the centripetal force on it decreases
False
True
40
linear momentum of a truck will be greater than that of a bus if
any of above
trucks speed is larger than bus but mass is the same
trucks mass and speed are both larger than bus
trucks mass is larger than bus's but speed is same
41
work is done on an object when
moves in circle at constant speed
accelerated in a straight line
all the above
carried horizontally at constant speed
42
uniform motion is any motion at constant speed
false
true
43
starting from rest a 2 kg body acquires a speed of 8 m/s in 2 seconds. net force action on body is
2N
4N
8N
16N
44
net force means the vector sum of all the individual forces acting on a particular body
True
False
45
rate of doing work
energy
internal energy
leber
power
46
motion in a circle at constant speed is motion with constant velocity
false
true
47
can be stored in a spring
elastic potential energy
kinetic energy
internal energy
48
the metric prefix that means on thousand is milli
false
true
49
air resistance is one example of
static friction
field
kinetic friction
simple harmonic motion
50
there are one thousand megabytes in a gigabyte
false
true
51
acceleration of a body is
always in same direction as net force on body
always in same direction as its velocity
in direction body is moving
equal to net force on body
52
type of collision in which kinetic energy is conserved
energy
inelastic collison
heat
elastic collison
53
if force on an object is aimed perpendicular to direction of objects velocity the force does
positive work
negative work
no work
any of above
54
mass of an object times its velocity
power
linear momentum
55
associated with circular motion
gravitational potential energy
angular momentum
linear momentum
56
what are SI units of momentum
pascals
joules
watts
kg m/s
57
Si units of acceleration
m/s2
m/s
mi/h
km/h
58
motion in a circle at constant speed is motion with
constant velocity
constant acceleration
none
both
59
twenty milliseconds is 0.020s
false
true
60
type of collison in which kinetic energy is not conserved
elastic collision
inelastic colision
61
linear momentum is definitely conserved
True
False
62
which is larger newton or pound
pound
newton
63
force needed to make an object move in a circle is
weight
kinetic friction
centripetal force
static friction
64
the number of cycles of a periodic process that occer per unit time is called the period
true
false
65
energy stored in a stretched spring is an example of gravitational potential energy
True
False
66
when a car goes around a curve at twice the speed the centripetal for on the car doubles
False
True
67
the weight of an object equals its mass times the acceleration of gravity
False
True
68
the proper abbreviation for kilohertz is kHz
false
true
69
the slope of a velocity vs time graph is the
velocity
acceleration
none
distance
70
a body at the end of a spring oscillates up and down ten times in five seconds. the period of oscillation is
5
0.5
2
10
71
force that acts times the distance moved in the direction of the force
work
internal energy
72
measure of a systems capacity to do work
energy
power
73
the SI units of velocity are
m/s
km/h
mi/h
m/s2
74
kinetic energy is definitely conserved
False
True
75
if force on an object is aimed in the direction of objects velocity the force does
none of above
positive work
negative work
no work
76
if an objects speed is constant its velocity must also be constant
false
true
77
you push on a block of frictionless ice with force of 8n causing it to accelerate at 2 m/s
2.
mass of the block is
2 kg
16kg
4kg
8kg
78
if a force on an object is aimed opposite the direction of the objects velocity the force does
any of above
negative work
positive work
no work
79
linear momentum is conserved in all collisions
False
True
80
energy stored in a pile driver is an example of gravitational potential energy
True
False
81
work done within an isolated system can increase the energy of the system
False
True
82
the proper abbreviation for grams is g
true
false
83
conservation laws can be used even when the details of what is occuring inside a syste, arent known
True
False
84
an object moving in a circle undergoes
constant accerleration
freefall
linear acceleration
centripetal acceleration
