Final Exam Flashcards
If a scientist studies new ways to make batteries for electric cars, it is considered…
Technology
According to the textbook, what question is answered by science?
How?
For scientific study, which of these must occur?
a. testing and logic
b. philosophy and psychology
c. understanding and wisdom
d. observation and testing
d. observation and testing
In science, facts ______ _________.
can change
What can be used to explain many phenomena within a particular area of science?
Theories
If pulled rapidly, a tablecloth can be pulled out from under a table full of dishes without the dishes moving. This is because the dishes have…
inertia.
A car and a truck are speeding down I-24 at 75mph. The ______ has more inertia because it has more ______.
Truck; mass
If you go to the moon, your mass would…
be the same as on earth.
What is defined as a push or a pull?
Force
A book is sitting on a table without moving. What is true of the force on the book?
The net force on the book is zero.
the only difference between speed and velocity is…
velocity includes direction and speed does not.
If a car is driving towards the south and the net force on the car is toward the north, the car will…
Slow down
A rock is dropped from a tall cliff under free fall conditions. How far will the rock fall in 4 seconds?
80m
d=1/2gt^2 = 1/2 (10)(4)^2 = 80m
A rock is dropped from a tall cliff under free fall conditions. How fast will the rock be falling 3 seconds after it is dropped?
30m/s
v = gt = 10(3) = 30m/s
Which of these is not true about free fall (on earth)?
a. acceleration is 10m/s
b. an object will reach terminal velocity if it falls far enough.
c. the only force is gravity.
d. all objects fall at the same rate.
b. An object will reach terminal velocity if it falls far enough.
Newton’s Laws of Motion indicate that if an object is in motion and the net force is zero, the object will…
continue in a straight line at the same speed.
what is the weight of a box whose mass is 20kg?
200 N
w = 20(10) = 200N
If a feather and a rock are dropped under free fall conditions,
the rock and the feather will hit the ground at the same time.
If a feather and a rock are dropped and they fall through the air,
the rock will hit the ground first.
Which of these is not true about terminal velocity?
a. acceleration is zero.
b. all objects fall with the same velocity
c. velocity is constant
d. weight = air resistance
b. all objects fall with the same velocity
True or false, if a ball is rolling down a ramp, the support force will be straight up.
False, the support force will be perpendicular to the surface of the ramp - at an angle.
True or false, if a ball is rolling down a ramp, the gravitational force will be straight down.
True
If a ball is rolling down a ramp, the frictional force will be ____________________.
up the ramp.
A box is sitting on a table with a force of 25N to the left and 5 N to the right. What is the net force on the box?
20N to the left.