Physics Final Exam Matching & Multiple Choice (Canales) Lap 1 & 2
A car maintains a constant velocity of 100 km/h for 10 seconds. During this interval is acceration is
0
You use the same force to push two objects; If one has four times the mass, its acceleration will be ______.
1/4
The force of friction on a sliding object is 10N. The applied force needed to maintain a constant
10 N
An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about
10 m/s
An object in free fall has an acceleration of
10 m/s^2
A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is
20 km/h
What is Net Force of an object that is pulled 5N and 30N to the left?
25N to the left
A man weighing 800N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale would be...
400N
What is Net Force of an object that is pulled with 10N to the right and 15N ?
5N to the left
If a car increases its velocity from zero to 60 km/h in 10 seconds, it acceleration is
6 km/h/s
If a 12N falling object encounters 20N of air resistance, what is the Net force on it?
8N
A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second
9.8
Speed over a period of time
Average Speed
A well established belief
Fact
A car's speedometer shows the car's constant speed.
False
Air resistence on a falling object depends on the objects area and weight.
False
Equations are used to show connections between concepts in nature.
False
F is a scalar quantity.
False
Inertia is an objects willingness to change its motion.
False
Newton's 2nd Law: For every action there is an equal and opposite reaction.
False
You can hit a Kleenex hanging form a string with the same force as a watermelon from a rope.
False
A vector quantity has a direction only.
False (magnitude and direction)
What force slows down a moving object?
Ff (friction)
An air bag decreases the _____ of an impact by increasing the ____ of the impact.
Force; time
Speed at an exact moment
Instantaneous Speed
A proven theroy is a...
Law
Net Force of an object in Equilibrium
Net Force=0
An object that stays at rest...
Newtons 1st Law
Speed is a...
Scalar Quantity
A buzzing fly has a greater momentum than a ship in a harbor.
True
A cannon and a cannon ball have different accelerations because of their different masses.
True
A helicopter's blades push the air down, so the air pushes the helicopter up.
True
Ideas can be tested using the scientific method.
True
Inertia, F=ma, ma=ma : are Newton's 1st, 2nd, and 3rd laws in that order.
True
The earth pulls down on you with a force; and you pull up witht the same amount of force.
True
Using a Parallelogram method, the diagonal represents the sum of the vectors.
True
Velocity is a...
Vector quantity
To change the momentum of an object, you need to change the objects ________.
Velocity
In science, a theory is
a hypothesis that most agree with
In science, facts
can change
A baseball that is _____ has the greatest change in momentum.
caught and thrown back
If the foward force on a moving object is just as equal to the friction, its velocity will be ____.
constant
The two measurements necessary for calculating average speed are
distance and time
Pool balls bouncing off of each other is an example of a _____ type of collision.
elastic
Whereas Aristotle relied on logic in explaining nature, Galileo relied on...
experiment
If you push a crate and it doesn't move; what is canceling out the force of your push?
friction
Science and technology
fundamentally different from each other
When a scientist is dishonest and reports false information, he or she..
gets no second chance in the scientific community
In science, and educated guess is a
hypothesis
To change momentum of an object, a _____ is needed.
impulse
As you increase the F on an object, its acceleration will ______.
increase
A train car hits a car at rest, they lock numbers and move together. Their velocity after compared to before is ______.
less
To crash without feeling much force, decrease the momentum over a _____ period of time.
long
The inertia of an object descends on its _____.
mass
An objects weight depends on its:
mass and gravity
Twelve seconds after starting from rest, on object falling freely will have a speed of
more than 100 m/s
This is the law of conservation of momentum.
mv before=mv after
Of the sciences known as physics, chemistry, and biology, the most basic is...
physics
The same two cars above, but this time they bounce off of each other. The velocity of the car that was at rest is ______.
same
In karate, hit the object over a _____ period of time.
short
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates...
the milk carton has inertia
If an object is on the moon, its _____ is different.
weight