Physics 10 Quiz Questions
An apple weighs 1 N. The net force on the apple when it is in free fall is
1N
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, what is the sack's acceleration?
0 m/s/s
A falling skydiver of mass 100 kg experiences 600 N air resistance. What is her acceleration? (For this problem, g = 10 m/s2)
0.4 g
A 10 N object moves at 1 m/s. Its kinetic energy is
0.5 J
An apple weighs 1 N. When held above your head, the net force on the apple is
0N
The mass of a dog that weighs 100 N is about
10 kg
If a freely‑falling object were somehow equipped with a speedometer, its speed reading would increase each second by about
10 m/s
If you drop an object, it will accelerate downward at a rate of 10 meters per second squared. If you instead throw the object downward its acceleration is...
10 m/s/s
A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is
10 times as much as the force on the 1 kg book.
A man falling through the air with a parachute on weighs 500 N. When he opens his chute, he experiences an initial air resistance force of 800 N. The net force on the man is
300 N upward
Which has greater kinetic energy, a car traveling at 20 km/hr or a half‑as‑massive car traveling at 40 km/hr?
40 km/hr car
An object is in free fall moving in the vertical direction only. At one instant, it is traveling at a speed of 55 meters per second. Exactly one second later, its speed is about
45 m/s
A person is attracted towards the center of the earth by a 500 N. gravitational force. The force that the earth is attracted toward the person is
500 N
A man weighing 800 N stands on two bathroom scales; one foot on each scale. The reading on one scale is given to be 200N, so the reading on the other scale is....
600N
A car accelerates at 3 meters per second per second. What is its speed 3 seconds after the car starts moving from rest?
9 m/s
No work is done...
if the force is perpendicular to the displacement
Mass is a measure of an object's
inertia
One object has twice as much mass as another object. The first object also has twice as much
inertia
Momentum is....
inertia in motion
A car travels in a circle with constant speed. The net force on the car
is directed towards the center of the curve.
An object is tossed straight upward. When the object gets to the top of its path, at that instant.....
its velocity is zero, but its acceleration is g, down.
Compared to its weight on Earth, a 10 kg object on the Moon will weigh
less
When an object is projected straight up and eventually falls back down, if you include air resistance, then the time it take for the object to travel upward compared to its time to make the same distance trip downward is...
longer time on the way down, shorter on the way up
An object maintains its state of motion because it has
mass
If the velocity of a body is zero, then its acceleration
may be zero but only if the velocity is zero not for an instant but for an extended time.
The best units for acceleration would be...
meters per second squared
A 1 N apple falls to the ground. The apple hits the ground with a force of about
not enough information to say
What is required to keep an asteroid moving for billions of years out in deep space?
nothing
When a very massive object collides with a small mass...
on impact the masses experience the same force
Newton's third law say that
only an even number of total forces (occurring in pairs) exist in the universe.
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work, but different amounts of
power
Temperature is ....
related to the average kinetic energy of all the particles in a body.
Compared to its mass on Earth, the mass of an object on the Moon is
same
There is a connection between momentum conservation and Newton's
second and third law
Two bodies in thermal contact will eventually have the same.....
temperature
In which case would the bottom of a paper bag carrying groceries be most likely to be ripped open?
the bag is accelerated upward
If a body is speeding up, then you know that
the body's velocity is parallel to its acceleration.
Internal energy is.....
the combination of the temperature of a system and the number of atoms it contains.
Kinetic energy is...
the energy a body has because it is moving.
The unit of energy in the SI system (e.g. meters, seconds, kilograms, etc...) is
the joule
At absolute zero....
the motion of all atoms would be zero
Momentum is conserved when....
the net external force on the system is zero.
An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?
the one on the Moon
As a ball falls, the action force is the pull of the earth's mass on the ball. What is the reaction to this force?
the pull of the ball's mass on the earth.
A feather and a coin will have equal accelerations when falling in a vacuum (no air resistance) because
the ratio of each object's weight to its mass is the same.
Two systems are in thermal contact. One system has a large internal energy and the other has a small internal energy. Thermal energy (i.e., heat) will flow from ...
the system with high temperature to the system with low temperature
Heat is ....
the transfer of thermal energy because of a difference in temperature between two systems..
Newton's second law says that if the acceleration of a body is zero then
the vector sum of all the forces acting on the body must be zero.
The unit of power in the SI system (e.g. meters, seconds, kilograms, etc...) is
the watt
"The net external work done on a system equals the change in the energy of the system" is a statement that tells you...
what the work-energy theorem is.
That work changes energy is a statement that tells you...
what work does
QUIZ SET 3: WRONG
When an object is in free-fall, it's weightless, and the only force that's acting upon it is gravity -- and the force of gravity is dependent on the mass and acceleration of the object; mass and acceleration are independent here.
A moving object has
all the other ones
Among other things, Newton's third law says that
force is an interaction between two bodies
Your weight is a measure of your
gravitational attraction to the earth.
An object following a straight‑line path at constant speed
has zero acceleration.
Two billiard balls having the same mass roll toward each other (each having 10kg*m/s of momentum) and are about to make a head-on collision, each moving at the same speed. What is the combined momentum of the two balls?
0 kg*m/s
Why does the weight of a body not make it accelerate faster in free fall?
Because the ratio of a body's weight to its inertial mass is the same for all bodies
What is inertia?
Inertia is a property that describes a body's disposition to resisting acceleration (maintaining a constant velocity)!
As an object falls, is momentum conserved?
It depends on the system
Intensity is....
Power over an area
In terms of Newton's second law, if the acceleration of a body is zero then you know...
That without exception the vector sum of all the forces acting on it must be zero.
Why is a longer barrel on a gun sometimes desired, what does it give you?
The longer barrel causes the bullet to have a greater velocity, because the work done will be greater due to the longer distance that the bullet will travel for in the barrel; hence, causing the bullet's greater velocity and energy.
Concerning gravitational mass and inertial mass....
They are the same numbers, but different ideas.
Concerning gravitational mass and inertial mass....
They are the same numbers, but totally different ideas.
Heat is...
a transfer of thermal energy
A calorie is a ...
a unit of energy
The temperature of space is
about 3K
Disregarding air resistance, objects fall at constant
acceleration
If you punch a hole in a metal sheet and then heat the sheet increasing its temperature then, the sheet gets bigger and the hole gets...
bigger
The two ways you can change the energy of a system are...
by doing work on it or by heat transfer to or from it.
If an object has a constant acceleration, the velocity of the object must
continually change by the same amount each second
Suppose a particle is accelerated through space (no gravity) by a 10 N force. Suddenly the particle encounters a second force of 10 N in the opposite direction of the first force while the first force is still present. The particle
continue at the same speed at had when the second force started to act on it.
Suppose a particle is accelerated through space (no gravity) by a 10 N force. Suddenly the particle encounters a second force of 10 N in the opposite direction of the first force while the first force is still present. The particle
continues moving at the same speed it had when encountering the second force.
Two billiard balls having the same mass roll toward each other about to make a head-on collision, each moving at the same speed. What is the combined momentum of the two balls?
0 kg*m/s
If you drop an object, it will accelerate downward at a rate of 10 meters per second squared. If you instead throw the object downward, after it leaves your hand, its acceleration is...
10 m/s/s
A bullet is dropped from the top of a very tall skyscraper while another bullet is fired downward from the same place. Neglecting air resistance, acceleration is greatest for the
10 m/s/s for each
A package falls off a truck that is moving at 40 m/s, horizontally. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
40 m/s
Two people pull on a rope in a tug‑of‑war. Each pulls with 400 N of force. What is the tension in the rope?
400N
A 10 N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
6N
What is an example of a body moving where its velocity is opposite its acceleration?
When an object is in thrown up into the air, in free fall, the direction of the object's velocity is UP, but is slowing down, which means that the acceleration is DOWN.
What are the conditions for when a body slows down?
When the velocity is opposite the acceleration
When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, the time of the impact is about 10 times more what it would be in a stiff‑legged landing. In this way the average force your body experiences is reduced by
about 10 times
When an object falls through the air, its velocity increases and its acceleration
decreases
The temperature of a system
does not depend on the number of atoms in the system
An object at rest may have
energy
When work is a negative value then...
energy will decrease
The force that accelerates a rocket in outer space is exerted on the rocket by the
exhaust gases.
When a person holds a gun so that the gun never accelerates and then fires the gun such that the gun still does not accelerate, the force of the gun on the bullet (via the expanding gases in the barrel of the gun)
is equal to the force of the gun on the person's hand.
If the speed of a moving object doubles, then what else doubles?
momentum
A large truck and a tiny Prius traveling have a head‑on collision. The vehicle to undergo the greatest change in velocity will be the
the Prius
Energy is...
the ability to do work
The Richter Scale, used in measuring earthquakes, uses a number to describe...
the accumulated potential energy released by an earthquake
A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because
there is still a net force acting on the wagon.
Energy is conserved ...
when no net external work is done on the system.
