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Física Etapa 4
Física Etapa 4
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1
It is the ratio of the output or useful mechanical work to the applied or input mechanical work.
Power
Mechanical Resistance
Efficiency
Mechanical advantage
2
The unit discussed in the previous question is called...
joule
watt
newton
erg
3
The mathematical expression of Work is:
W · t
½m · v²
F · cos(θ) · x
mg
4
The product of the mass of a body and its velocity is called:
Power
Impulse
Potential energy
Movement amount
5
An object may possess:
Power
Energy
Work
Force
6
The mass of a body depends on:
Its position relative to the Earth's surface.
The acceleration of gravity.
Its shape.
Its amount of matter.
7
The equation Ft = mvf − mvi is the expression of:T
movement amount
the relationship between impulse and change in the amount of motion
the second law of Newton
acceleration
8
With respect to the forces applied to the body, it will move at a constant speed when:
the acceleration is different from zero
the sum of all the applied forces, is equal to zero
the sum of all applied forces is different from zero
only one force is applied to the body
9
Momentum is a quantity:
Scalar
Dimensionless
Vectorial
Fundamental
10
A body moving with constant acceleration must experience equal changes in:
Weight
Mass
Acceleration
Speed
11
It is the part of Physics that studies movement and the causes that produce it:
Kinematics
Statics
Dynamics
Kinetics
12
They are units by which the work in the IS is measured.
dina · cm
N · m
kg · m
N · m²
13
Energy is measured with the same units in which it is measured...
speed
power
work
acceleration
14
It is the ratio of the output or resultant force to the applied or input force.
Ideal efficiency
Mechanical work
Effective mechanical power
Actual mechanical advantage
15
Of the situations outlined below, the one in which the object has a more significant amount of movement (momentum) is:
A man running.
A child riding a tricycle.
A railroad at rest on the tracks.
A truck parked on a street.
16
The total amount of movement of a system is retained as long as:
The resulting external force acting on the system is zero
All the bodies of the system have the same weight
All the bodies in the system have the same mass
All the bodies in the system have the same velocity
17
3 People climb a wall (weighs the same for all) If 1 did it in 20s, 2 in 26s and 3 in 40s. Who did the most work
1
3
2
They all did the same job
18
What is the power unit in the International System?
erg
joule
watt
c.v.
19
It is the mathematical expression of the impulse:
Ft
mv
mv²
mgh
20
A cue ball collides with a red ball at rest... they move together... velocity is:
Equals half the velocity of the target before the collision
Greater than the white one before the collision
It's the same as the white one before the collision
Zero
21
Concerning the street level, a person at his home would have greater gravitational potential energy being...
at rest, on the second floor
moving on the second floor at a rate of 1.0 m/s
at rest, on the roof
in the room at a rate of 1.2 m/s
22
The amount of movement (momentum) is a quantity:
Dimensionless
Scalar
Vectorial
Fundamental
23
If two bodies have the same amount of motion, it would mean that:
Both have the same weight.
They both have the same mass.
They both have the same speed.
The product mv in both has the same value.
24
A car brakes suddenly. What happens to the occupants, even if they are wearing their seat belts? (Acc Law of Inertia)
They remain motionless, since they are wearing their seat belts.
They move forward, but are stopped by the seat belt.
Depends on the car.
They fly out the car and possible die or break a bone.
25
Which of the following contains only fundamental units?
Time, distance, force, and speed
Force, acceleration, area, and volume
Mass, speed, time, and temperature
Mass, distance, time, and temperature
26
In the International System (IS), the units to measure the amount of movement (momentum):
(kg)(m²)/s²
(N)(m)
(kg)(m/s)
(kg)(m)
27
When a body is accelerated…
its speed always increases.
its speed remains constant.
a net force must be acting on it.
its direction never changes.
28
Examples of second-class levers:
Scale, pliers, scissors & tongs
Bread tongs, hammer, fishing rod
Wheelchair, book and gun
Wheelbarrow, nutcracker, bottle opener
29
An object moves with a constant speed of 6 m/s. This means that the object:
Moves 6 m every second.
Increases its speed by 6 m/s every second.
Decreases its speed by 6 m/s every second.
Does not move.
30
A body that moves with constant speed must experience equal changes in:
Its position
Its mass
It does not present any change
Its volume
31
It is the energy of movement:
Power
Chemistry
Static
Kinetics
32
Which of these options contains only branches of Classical Physics?
Thermodynamics, Nuclear, Atomic
Nuclear, Atomic, Relativistic
Thermodynamics, Optics, and Subatomic Particles
Acoustics, Optics and Mechanics
33
In an elastic collision between several bodies, the following is preserved:
The total kinetic energy and the amount of total movement
Both, as long as the objects have the same mass
The total kinetic energy, but not the total amount of motion
The amount of total movement, but not the total kinetic energy
34
It is the mathematical expression of gravitational potential energy:
mgy
½mv²
mg cos θ
mg sin θ
35
Type of lever where the support point is between the points of application of the effort and the load.
Second-class lever
First-class lever
All of them
Third-class lever
36
Type of lever where the load is between the fulcrum and the point of application of the effort force.
Third-class lever
All of them
First-class lever
Second-class lever
37
The power developed by a person when dragging a bundle of cement on the ground depends...
Of what is stated in a, b, and c.
only by the magnitude of the force applied by the person
only of the time spent in the process
only by the magnitude of the distance traveled by the bundle
38
If we know the value and direction of the net force applied to its mass, Newton scnd law is sufficient to calculate its:
Position
Velocity
Speed
Acceleration
39
Simple machines are derived from the following fundamental machines which are:
The lever and the inclined plane
The pulley, the hoist, and the worm screw
The pulley, the inclined plane, and the lever
The inclined plane and the hoist
40
A boy and a girl, both of equal mass and with skates... this action will make the boy...
He slides in the same direction and velocity as the girl
keeps it at rest
He slides in the opposite direction and at the same velocity as the girl
He slides in the same direction and at half the girl's velocity
41
The result of a measurement is considered:
Measurement
Standard unit
Physical magnitude
Physical quantity
42
The product of the force acting on a body and the time during which it does so is called:
Impulse
Power
Kinetic energy
Potential energy
43
Potential energy is a physical quantity:
Fundamental
One-dimensional
Scale
Vectorial
44
The amount of movement (momentum) of a body does not change if the body...
falls freely.
keeps its speed constant.
slows down its speed.
increases its speed.
45
When a body falls freely, its amount of movement:
Increases
Remains constant
Is zero
Decreases
46
Examples of first-class levers:
Bread tongs, hammer, fishing rod
Scale, pliers, scissors & tongs
Wheelbarrow, nutcracker, bottle opener
Wheelchair, book and gun
47
A man twice a child's weight... would move with a velocity:
Of the same magnitude and sense as the child's velocity
Half the magnitude and in the opposite direction to the child's velocity
Half the magnitude and the same sense as the child's velocity
It is of equal magnitude but opposite to the child's velocity
48
A moving object accelerates at a rate of 4 m/s², this means that the object:
Takes 4 seconds to travel 1 m.
Its speed changes by 4 m/s every second.
Travels 4 m every second.
Travels 4 m every second.
49
The units of measurement for the impulse in the IS are:
kg·m²/s²
N·s
N·m
kg·m
50
It is the product of the force by the distance along which the force acts:
Kinetic energy
Power
Potential energy
Work
51
In Physics concepts, what is the difference between mass and weight?
Mass is the amount of matter, and weight is what that matter weighs.
There is no difference, the two magnitudes express the same concept.
Weight is the force of attraction, and mass is the measure of inertia.
Mass is the force of attraction, and weight is the amount of matter.
52
The one that represents the relationship between impulse and the change in the amount of movement (momentum) is:
Ft = ma
F = Δp
F = m − vi
Ft = mvf − mvi
53
He is considered the father of the scientific method for the contributions he made to the study of science:
Isaac Newton
Galileo Galilei
Socrates
Aristotle
54
The J/s unit is called...
dina
newton
erg
watt
55
The Work done in the time unit, or how quickly the Work is done, is known as:
Power
Kinetic energy
Potential energy
Mechanical energy
56
When comparing a property or physical quantity with another of the same class that is taken as a reference, it is:
Physical magnitude
Physical quantity
Standard unit
Measurement
57
Examples of third-class levers:
Wheelchair, book and gun
Wheelbarrow, nutcracker, bottle opener
Scale, pliers, scissors & tongs
Bread tongs, hammer, fishing rod
58
Which of the following contains only fundamental units?
Mass, distance, time, and temperature
Force, acceleration, area, and volume
Mass, speed, time, and temperature
Time, distance, force, and speed
59
A cue ball collides with a red ball at rest... white comes to rest. Red ball’s velocity is:
Less than the white one before the collision
Same as white's before the collision
Equal to zero
Greater than the white one before the collision
60
It is the mathematical expression of kinetic energy:
½mv²
mgy
Wt
wy
61
If the net or resultant force acting on a body is non-zero, the object is caused to:
An impulse
All of the options
A change in their amount of movement
A change in velocity
62
The kinetic energy of a body is related to its:
Movement
Temperature
Position
Electric charge
63
Newton's first law is also known as:
The principle of universal gravitation.
The principle of conservation of energy.
The principle of conservation of mass.
The principle of inertia.
64
When the total kinetic energy before and after a collision is the same...
Deformative
Inelastic
Plastic
Elasticity
65
The energy possessed by a body due to its position concerning other bodies is called:
Potential
Static
Calorific
Kinetics
66
A person would have higher kinetic energy being...
pushing against a wall
floating in a pool
running down a street
walking down a street
67
If the net or resultant force acting on a body is zero, the object manifests:
A change in their amount of movement
An impulse
A change in velocity
None of them
68
The action and reaction forces do not cancel each other out because:
They have different magnitudes
They act on different bodies
They act in the same direction
They act in opposite directions
69
Which of the following measurements is considered a derived unit?
3 h
3 km
3 m/s
3 km/h
70
The unit to measure the energy in the IS is...
kg · m/s²
kg · m³/s³
g · cm²/s²
kg · m²/s²
71
Kinetic energy is a physical quantity:
Vectorial
Fundamental
Scale
Dimensionless
72
It is the mathematical expression of the amount of movement (momentum):
mv
mgh
mv^2
Ft
73
What would happen to the box if you jumped on top of it
It would move to one side.
It would not be affected.
It would be crushed.
It would also jump.
74
Machine A lifts a weight of 2000 N to a height of 2 m in 30 seconds; machine B does the same as A in 20 seconds.
B develops more power than A
B does more Work than A
A does more Work than B
A develops more power than B
75
When a net force of 1 N acts on a body of 1 kg, the body acquires:
a speed of 9.8 m/s
an acceleration of 9.8 m/s^2
speed of 1 m/s
an acceleration of 1 m/s^2
76
For the amount of movement or momentum of a body to change, it must be met that...
the net or resultant force on the body is zero
the initial velocity of the object is zero
the net force on the body is different of zero
the final velocity of the object is zero
77
Type of lever where the point of application of the effort force is between the fulcrum and the load.
Third-class lever
All of them
Second-class lever
First-class lever
78
The idea that Newton's laws of motion did not apply to objects moving at speeds close to the speed of light comes from:
Isaac Newton
Galileo Galilei
Stephen Hawking
Albert Einstein
79
When lifting a body after it has been thrown vertically upwards, its amount of movement:
Remains constant
Is zero
Decreases
Increases
80
Of the following statements, the correct one is:
Work is done, you hold an object, and walk at a constant speed horizontally
Work is done if a person pushes a wall of their house for a certain time
Work is done if a person at rest holds a heavy object for a specific time
Work is done when you pushe a stroller, then moves some distance above grnd
81
The gravitational potential energy of a body is related to its:
Position
Movement
Temperature
Electric charge
82
It is the ability of a body or system to perform Work:
Momentum
Power
Work
Energy
