Transcript 100

Vocabulary
Multiple
Choice
Describe
Critical Thinking/
graphs
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Motion
Any change in position over
time is an example of
______________________.
Vocab 100
D. Reference Point
What is an object that appears to stay in
place that helps you detect motion in
another object?
a. a newton
b.a black hole
c. a lubricant
d. a reference point
M.C. 100
Mass is the amount of matter in an object, and weight is a measure of
gravitational force experienced by the object. Mass is constant, while
weight may change with location
Describe two differences between
mass and weight.
Describe
100
Sample Answers
Reducing: 1. use oil to grease hinges
2. Soap to take rings off 3.
use a cart to move heavy objects
Helpful: 1. Brakes on cars 2. the static friction of your shoe on a
bicycle pedal
3. Warm hands when cold
List three ways of reducing friction
in everyday life. Then list three
examples of friction being helpful in
everyday life.
CT & Graphs
100
Force
The newton is the
SI unit of
______________________.
Vocab 200
b. friction between car tires and the road that moves a car
forward
Which is an example of friction that is helpful?
a. friction that causes engine parts
to wear out
b. friction between car tires and
the road that moves a car forward
c. friction that wears holes in your
socks
d. wind causing soil erosion
M.C. 200
To determine average speed, divide the total distance by the total time
taken to travel that distance.
Describe how to determine
average speed
Describe
200
The gravitational force between me and the Earth is large. The
gravitational force of the sun affects me much less than it affects the
Earth. The gravity between the sun and planets is large because the
objects have large masses.
Discuss how the gravitational force
of Earth affects you.
Include a description of how
the gravitational force of the
sun affects you as compared to
how it affects Earth.
CT & Graphs
200
Velocity
The speed of an object in a
particular direction is
_____________________.
Vocab 300
C. starting velocity, final velocity, and time it takes to change
velocity.
To calculate an object’s acceleration, you need
to know
a. distance traveled and total time.
b. starting point, endpoint, and the object’s mass.
c. starting velocity, final velocity, and time it
takes to change velocity.
d. average speed and direction traveled.
M.C. 300
Speed is distance over a period of time, and velocity is speed with
direction. The difference between speed and velocity is that speed does
not have direction, while velocity does have direction.
Describe both speed and velocity,
and state the difference between
the two.
Describe
300
The student’s weight on the moon would be 70 N, which is
1/6  420 N.
A student has a weight of 420 N on Earth.
Assume that the moon’s
gravitational force is exactly 1/6 the
gravitational force on Earth.
What would be the student’s weight in
newtons on the moon?
Explain your calculations.
CT & Graphs
300
Friciton
A force that always acts
to oppose motion is
______________________.
Vocab 400
a. Have greater masses.
The force of gravity is greater between
two objects that
a.
b.
c.
d.
have greater masses.
have rougher surfaces.
are farther apart.
are moving at greater speed
M.C. 400
Unbalanced forces produce change in the motion of objects. In
moving objects, unbalanced forces can change the motion. In nonmoving objects, unbalanced forces can start motion.
Describe how unbalanced forces
affect both moving objects and
nonmoving objects.
Describe
400
Kyle achieved the greatest average speed during the interval between 5
minutes and 10 minutes. The distance traveled during this interval (2 km)
was greater than the distance covered in any other 5-minute interval.
During which 5minute interval
did Kyle achieve the
greatest
average speed?
CT & Graphs
400
Weight
An object’s
______________________
can change with its location.
Vocab 500
d. 5 N north.
Two forces act on an object. One force has a
magnitude of 10 N and is directed toward the
north. The other has a magnitude of 5 N
directed toward the south. The object
experiences a net force of
a.
b.
5 N south.
15 N north.
c.
d.
50 N north.
5 N north.
M.C.500
Subtract 1.8 m/s from 1.5 m/s. Divide that by the 180 seconds that it took
the hiker to get to the top of the hill. We know the answer will be
negative, because the final speed is slower than the initial speed.
A hiker’s initial speed at the bottom
of the hill is 1.8 m/s and 1.5 m/s
when the hiker reaches the top.
It took the hiker 180 s to climb the hill.
Explain how to calculate the
hiker’s acceleration, including whether it
would be positive or negative.
Describe
500
Kyle probably stopped. He did not travel any distance in this interval.
What may have
happened in the time
period between 10
and 15 minutes?
CT & Graphs
500