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Physical Science Final Exam
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Gravity
Terms in this set (104)
Acceleration can involve any of the following except
Change in measurement units
A measurement of 0.00364 grams is same as
3.64 mg
A vector has what 2 properties
magnitude and direction
When a speed of 65 mph is converted to m/sec
29.1 m/sec
A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground
At the same time
The metric prefix that means 1/100 is
Centi-
The acceleration due to gravity at sea level is numerically equal to
9.8 m/sec^2
A car is moving down a freeway in a straight line at a constant rate of 23 m/s for 4.0 sec. Its acceleration is
0 m/s^2
The metric prefix that means one thousand (1000) is
Kilo
One microgram contains how many grams?
10-6
Density describes
Mass per unit volume
distance divided by time
velocity
The metric prefix that means one million is
mega
Which of the following is NOT an example of a vector quantity
Time
Which of the following is not a standard SI unit
Gram
The standard SI unit for time
Second
An automobile's acceleration may be changed by using the
Steering wheel
Velocity properly has units of
m/sec
In projectile motion in two dimensions, which of the following is not constant
Vertical Velocity
The metric prefix that means one-thousandth (1/1000) is
milli
One megabyte contains how many bytes
10^6
After conversion, 126 meters is equal to how many feet
413
The rate at which an object's velocity changes is called its
Acceleration
A car's speed changes from 35 m/sec to 8 m/sec in 5 seconds. Its acceleration is
-5.4 m/sec
One kilogram is the same as
1000 grams
When Bad Data is obtained in an experiment, good assumptions and interpretations can help generate good science
False
Ignoring air resistance, an object falling toward the surface of Earth has a velocity that increases as it falls
True
The tendency of an object to resist changes in motion
Inertia
The SI unit of force is
Newton
Newtons second law of motion uses
F=ma
The common definition of the weight of an object is
The gravitational force between the object and earth
A car accelerates from 5 m/sec to 30 m/sec in 14 seconds. The force that is felt by a 70 kg passenger in the car
125 newtons
In the expression F= Gm1m2/d^2, the d in the equation is the distance between
the center of mass of the two objects
Which of the following has the largest momentum
A pickup truck speeding down a highway at 20 m/sec
A 1000 kg car moving at 10 m/sec brakes to a stop in 5 seconds. The average braking force required for this stop is
2000 N
A 4 kg ball has a momentum of 12 kg m/sec. What is the balls velocity
3 m/sec
A girl pulls on a 10 kg wagon with a constant force of 30 Newtons. What is the wagons acceleration
3
A car that is about to go around a curve encounters a patch of ice and continues straight forward. Why does this occur?
Newtons first law
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in m/s??
3
Which of the following does mass not affect?
acceleration due to gravity
Newton's Equation to describe Universal Gravitation is believed to apply:
everywhere
What is necessary for a change in velocity? an
unbalanced force
When a floor holds up a person who is standing on it, the explanation is due to which Law?
Newton's Third Law of Motion
As an object moves further away from the earth, its mass does what?
remains the same
A mass of 30 kg has how much weight at sea level?
294 N
A mass of 2 kg moving in a circular path of radius 0.5 m at a speed of 8 m/sec has how much angular momentum?
8 kg*m/sec
Far out in deep space where gravitational forces are negligible, a space probe fires its rocket motor and accelerates. After the motor is shut off, what happens to the rocket?
The rocket will move at a constant speed
What is true about the parameter "G" used in Newton's Law of Universal Gravitation?
a It is a very small quantity
Which way does friction act on a moving object?
O Opposite the direction of motion
In outer space in the absence of air or gravity, an astronaut (who has his own air) pushes with a force of 12 newtons on a 4 kg rock and on a 2 kg rock. Which of the following is true?
Each rock will push back with a force of 12 newtons on the astronaut
An object simultaneously experiences a +40 N force (to the right) and a -10 N force (to the left). What is the net force experienced by the object?
30 N
If Object A has twice as much mass as Object B. which of the following for Object A would not be higher?
acceleration if the same force was exerted on both
Friction is always undesirable in any system.
False
The reason that astronauts away for earth's gravity to affect them. on the space station are weightless as they orbit the earth is because they are too far
False
The total momentum after a collision is always less than the momentum before the collisto.
False
A 1000 kg car traveling at 5 m/sec has more momentum than a 0.005 kg bullet traveling at 500 m/sec.
True
The best way to decrease the force required to stop an object is to decrease the contact time with the object.
False
At greater altitudes, the weight of objects increases proportionately.
False
It is impossible to have acceleration without a force being applied.
True
How many classes of levers are there?
3
Energy CANNOT be
created
The SI unit for work is the
joule
A 600 newton load is placed on a first class lever at a distance of 0,5 meters from the fulcrum. If the applied force is to be equal to 50 newtons, how far from the fulcrum must it be placed to lift the load?
6 m
A 5-kilogram mass at height of 2 meters has how much gravitational potential energy?
98 joules
When an object is raised to a particular height, it has gravitational potential energy. What is the source of this energy?
work required to lift the load
The energy associated with an object's motion is called its:
kinetic energy
Which of the following does not involve converting gravitational potential energy to kinetic energy?
A car that decelerates
What is the kinetic energy of a 2000 kg car that is moving at 30 m/sec?
900,000 joules
A frictionless 4-pulley system is used to lift a load. If the applied force is 40 N, then the load must weigh:
160 N
Which of the following is a second-class lever? (AF=applied force; L=load; F=fulcrum)
Wheelbarrow
Which of the following sources of electricity involves converting kinetic energy to electrical energy
Hydroelectric waterwheel
is the ability to do work
energy
A student weighing 500 newtons climbs a flight of stairs 3 meters high in 4 seconds. How much power is required for this task
375 watts
When the height of an object is increased, the gravitational potential energy:
increases
If a 10 kg mass falls from a height of 4 meters, how much kinetic energy does it transfer to the ground when it hits?
392 J
Work requires:
motion
As shown below, a wheelbarrow is an example of what class lever?
second class
The kinetic energy of a pendulum is least:
at the top of its swing
Power is:
Energy divided by time
Of the following choices, the smallest horsepower gasoline engine that could possibly power a 10,000-watt electric generator is what value? (1 horsepower=746 watts)
20
The equation for work is W=F/d
(False
Work and energy have the same units.
False
It is impossible to generate electricity without having some amount of environmental harm.
True
It is possible to get more energy out of a machine than is put into the machine.
False
Which of the following equations is not valid for performing electricity calculations?
V=I/R
The SI unit of electric current is the:
ampere
The SI unit of resistance is the:
ohm
The SI unit of power is the:
watt
Electric current in a wire is the flow of which particle?
clectrons
A light bulb with a resistance of 10 ohms is connected to a power supply with a potential difference of 36 volts. The electric current flowing through the bulb is:
3.6 A
8. A machine uses 50 watts of power for 600 seconds. The total energy consumed during that time is:
30,000 joules
Which of the following would cost the most money to operate?
1200-watt microwave for 10 minutes
Assuming a normal household voltage of 110V, how much current does a 1200-W hair dryer use?
10.9 A
A circuit breaker in a particular home circuit is rated for 20 A. Assuming a normal household voltage of 110 what value of equivalent resistance would be sufficient to trip the breaker?
5.5 ohms
Two light bulbs are hooked together in series. One bulb has a resistance of 5 ohms and the other has a resistance of 10 ohms. The total resistance of these bulbs is:
15 ohms
Two light bulbs are hooked together in parallel. One bulb has a resistance of 5 ohms and the other has a resistance of 10 ohms. The total resistance of these-bulbs is:
3.3 ohms
Which of the following typically consumes the least amount of electrical power in a typical home?
lights
Adding more resistances in parallel to a circuit causes the total current to:
increase
In a parallel circuit, when one load is removed disabled, the entire circuit is disabled.
False
All other things being equal, an electric circuit with less resistance consumes more current.
True
The primary electric circuits in our homes are wired in parallel.
True
When additional resistors are added to a series circuit, the total resistance decreases.
False
A circuit breaker is used in our homes as a safety device to break the flow of electric current.
True
Voltage, not current, is the primary electrical shock hazard.
False
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