Prologue and Chapter 1 Homework
What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s?
0 m/s^2
The net force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
You're driving in a car at 50 km/h and bump into the car ahead traveling at 48 km/h in the same direction. The speed of impact is
2 km/h
A 50 N object falling in air experiences 30 N of air resistance. The amount of net force on the falling object is
20 N
An object in free fall has a speed of 60 m/s. One second later its speed is
70m/s
the scientists to first introduce the concept of inertia was
Galileo
In Science a theory is
a synthesis of a large body of well-tested knowledge
When you stand at rest on a pair of bathroom scales, the readings on the scales will always
add to your equal weight
A tutor will be correct in saying that velocity and acceleration are
different concepts
A parachutist falling at constant velocity is in a state of
dynamic equilibrium (rest)
The scientific method is most effective in
gaining, organizing, and applying new knowledge
Science is a body of knowledge that extends back to
humankind's beginnings
During each second of free fall, the speed of an object
increases by the same amount
Whenever the net force on an object is zero, its acceleration
is zero
Aristotle believed that natural laws could be understood by
logic
On the surface of the moon where acceleration due to gravity is less, a person's hang time would be
longer
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
mass, inertia, and volume
In science facts
may change
According to Galileo, inertia is a
property of all matter
An object is pulled with two forces, 10 N northward and 15 N southward. The direction of the net force is to the
south
An object in mechanical equilibrium is an object
that is moving at constant velocity, that has no acceleration, and that is at rest
A truly educated person is knowledgeable about
the arts, religion, and science
An object weighs 30 N on Earth. A second object weighs 30 N on the moon. The object with the greater mass is the one on
the moon
What did Galileo incorporate in his study of motion that Aristotle overlooked?
the role of time
Compared with the mass of a certain object on Earth, the mass of the same object on the moon is
the same
When you push a crate across a level floor at constant speed, friction between the crate and the floor is
the same amount as your pushing force
As an object freely falls, its
velocity increases
If you toss a ball straight upward at 40 m/s with no air resistance, 6 seconds later its speed is
zero
The speed of a vertically thrown ball at the top of its path is
zero
