If an object has kinetic energy, then it also must have
A)
momentum
B)
potential energy
C)chemical
energy
D)
speed
How fast does an object fall in feet per second
A)
10 feet per seconds
B)
32 feet per seconds
C)
22 feet per second
D)
none of the above
If you do work on an object in half the time, your power output is
A) half original value
B)
double
C)
triple
D)
none of the above
If the speed of a moving object doubles, which of the following also
doubles?
A)
velocity
B)
kinetic energy
C)
moment
D)
potential energy
If the velocity of a moving object doubles, then what else doubles?
A)
velocity
B)
kinetic energy
C)
moment
D)
potential energy
A dog and a mouse run along a road with the same kinetic energy. The
faster runner is the
the faster runner is the mouse, for a dog and
a mouse to have same kinetic energy , the mouse must move faster than the dog,
a kinetic energy is directly related to the mass and speed of an object, if the
dog with greater mass will have same k.e with a mouse then the mouse must move
at greater speed.
An object at rest may also have?
A)
velocity
B)
kinetic energy
C)
moment
D)
potential energy
When the speed of a moving car is doubled, how much more kinetic
energy does it have?
A)
double
B)
triple
C)
halfed
D)
remain the same
Which of these forms of energy is not renewable?
A)
potential energy
B)
hydro power
C)
wind
D)
nuclear
A 2-kg ball is held 4m above the ground. Relative to the ground its
potential energy is?
A)
8j
B)80j
C)800j
D)
2j
A cat and a mouse run down the hallway with the same ke. The faster
moving one is the?
the faster is the mouse, kinetic energy is a
product of squared veleocity and objet mass, for mouse to have same kinetic
energy with
When an increase in speed doubles the momentum of a moving body, its
kinetic energy
A)
also doubled
B)
remain unchanged
C)reduced
to half
D)
none of the above
When a hybrid car brakes to a stop, much of its kinetic energy is
transformed to
A)
potential
B)
chemical energy
C)
heat energy
D)
friction
If an object has kinetic energy, it must also have
A)
potential
B)
chemical energy
C)
heat energy
D)
friction
When both the force and time of contact are doubled, the impulse on
an object is?
A)
doubled
B)
halfed
C)
unchanged
D)
tripled
The impulse-momentum relationship is a direct result of newton's
A)
1st law of motion
B)
2nd law of motion
C)
third law of motion
D)
none of the above
What kind of energy does a person experience most during skydiving?
A)
kinetic
B)
potential
C)
chemical
D)
none of the above
If the mass of an object decreases to half, and its speed doubles,
its momentum
A)
also doubles
B)
reduce to half
C)
tripled
D)
remain the same
Whereas impulse involves force and time, work involves force and
A)
speed
B)
distance
C)
displacement
D)
none of the above
If an object has momentum, it must also have
A)
speed
B)
kinetic energy
C)
momentum
D)
speed
Do heavier objects fall faster than lighter objects experiment
Both
heavy and light object fall at same rate in the absent of air resistance at a
rate of 10m/s
Why do objects fall at the same rate
Both
heavy and light object fall at same rate in the absent of air resistance at a
rate of 10m/s
Two objects dropped from the same height
Both
heavy and light object fall at same rate in the absent of air resistance at a
rate of 10m/s
Why do objects fall at the same rate in a vacuum
Both
heavy and light object fall at same rate in the absent of air resistance at a
rate of 10m/s
If two objects of different mass are dropped from the same height
what happens?
Both
the heavy and light object fall at same
rate in the absent of air resistance at a rate of 10m/s
What slows down a lighter object?
A)
gravity
B)
friction
C)
viscosity
D)
air resistance
E)
upthrust
How fast do objects fall in kmph
A)
2.77kmph
B)
3kmph
C)10kmph
D)10mph
If a charging rhinoceros has momentum, it must also have
A)potential
energy
B)
kinetic energy
C)
velocity
D)
none of the above
The bob of a simple pendulum has its maximum kinetic energy at the
A)
at the start
B)
midddle
C)
at the end
D)
just before the end
E)
just after starting
A heavy object and a light object are released from rest at the same
height
Both
heavy and light object fall at same rate in the absent of air resistance at a
rate of 10m/s
When a hybrid car brakes to a stop, much of its kinetic energy is
transformed to
A)
chemical energy
B)
potential energy
C)
statistical energy
D)
none of the above
An object has gravitational potential energy due to its
A)
gravity
B)
mass
C)
weight
D)
b and c
About 40 j is required to push a crate 4 m across a floor, what
force used?
A)
10n
B)
30n
C)160n
D)44n
Can a machine multiply input force? Input distance? Input energy?
Answer this question
When two vehicles collide, momentum is conserved in _______.
A)
elastic collision
B)
inelastic collision
C)
scattering
D)
fusion
When a drawn bow of potential energy 40 j is fired, the arrow will
ideally have a kinetic energy
A)
40j
B)
400j
C)20
D)
none of the above
If a machine multiplies force by a factor of 4, what other quantity
is diminished, and by how much?
Answer
this question
Recycled
energy is mainly
The power expended doing 100 j of work in 50 s is?
A)
5000watt
B)
0.5 watt
C)
2 watt
D)
10 watts
Which energy production method does not ultimately depend on the
sun?
A)
nuclear
B)
nuclear
C)
hydro
D)
fossil
What is the gain of potential energy of the barbell when it is
lifted to this height xm ?
the gain in the potential energy will be the
weight of the barbel multiplied by the given height xm.
For
example if the barbel is 120 newton, the p.e will be 120newton * xm.
An object lifted 10 meters gains 200 j of potential energy, the
object mass is ?
A)
40kg
B)
20kg
C)
2000kg
D)10kg
Calculate the power expended when a 500 n barbell is lifted 2.2 m in
2s
A)
250watts
B)
550watt
C)
1100 watts
D)2200
When joshua brakes his speeding bicycle to a stop, kinetic energy is
transformed to
A)
potential energy
B)
tension
C)
friction
D)
heat energy
Which requires the most amount of work by the brakes of a car?
A)
potential energy
B)
tension
C)
friction
D)
heat energy
When is the potential energy of something significant?
A)
when speed is zero
B)
when in motion
C)
when kinetic energy is maximum
D)
when object not static
Fossil fuels, hydroelectric power, and wind power ultimately get
their energy from _______.
A)
power stations
B)
earth
C)
sun
D)
none of the above
A ball rolling down an incline has its maximum potential energy at
A)
at the top
B)
middle
C)
just before landing
D)
just after starting
In what sense is energy from coal actually solar energy?
coal is a rock formed from carbonized plant
matter, found mainly in underground deposits over time, we know how plant use
sunlight energy to make their own food
(photosynthesis),
it is this same energy that is derived when
coal is heated.
therefore coal is also solar.
What is the source of energy in sunshine
A)
fusion
B)
fission
C)
radioactivity
D)
none of the above
How does speed affect the friction between a road and a skidding
tire
Answer this question
Calculate
the work done when a 20 n force pushes a cart 3.5 m
A)
70
B)
5.71
C)
20
D)
3.5
What will be the kinetic energy of an arrow having a potential
energy of 50ja)
A)
50j
B)
5j
C)
500j
D)
none of the above
Cite an example where a force is exerted
Answer this question
Calculate
the kinetic energy of a 3 kg toy cart that moves at 4 m/s
A)
12j
B)
24j
C)
1.33j
D)
48j
Calculate the change in potential energy of 8 million kg of water
dropping 50 m over niagara falls
A)
4billion joules
B)
400million joules
C)
160000 joules
D)
50joules
Calculate the work needed to lift a 90 n 4m up
A)
900n
B)360n
C)
3600n
D)22.5n
Calculate the power expended when a 20 n force pushes a cart 3.5 m
in a time of 0.5 s
A)
70watts
B)
140watt
C)
10watts
D)
35 watts
Calculate the increase in potential energy when a 20kg block is up
by 4m?
A)
80j
B)800j
C)5j
D)
4j
In which type of lever is the output force smaller
A)
1st order
B)
2nd order
C)
3rd order
D)
4th order
Calculate the work done when a 20 n force pushes a cart 3.5 m
A)70j
B)
5.71
C)
700
D)
200j
When one does twice the work in twice the time, the power expended
is _______.
Answer
this question
If a machine multiplies force by a factor of 4, what other quantity
is diminished, and by how much?
Answer
this question
If the force of friction on the crate is a steady 70 n, find the ke
gained by the crate.
Answer
this question
Can a machine multiply input force? Input distance? Input energy?
Yes or no
The
work done in pushing a tv set a distance of 2 m with an average force of 20 n
is
A)
40j
B)
2400j
C)
120j
D)
1200j
What does it mean to say that in any system the total energy score
stays the same
Potential
energy must be equal to kinetic energy, or system the mechanical energy of a
system is equal to constant ,
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