Transcript Unit 7 Bell Ringers - Trimble County Schools

What
is Newton’s 1st Law of
motion?
What equation is related to
Newton’s 2nd law of motion?
Calculate
the net force
acting on the box
Calculate
the force on a 25
kg rock moving with an
acceleration equal to 18.2
m/s2.
 Calculate
the acceleration of a 50 kg
rock with a 100 N force acting on it.
Why
is your weight less on
the Moon than on Earth, but
your mass is the same?
Calculate
the force on
an object that has a
mass of 12 kg and an
acceleration of 4 m/s2.
A
10-kg wagon has a
speed of 25 m/s. What is its
momentum?
Sally
sits on a rock. Her
weight is an action force.
Describe the reaction force.
Masses
Racquetball
= 20 grams
Tennis Ball = 57 grams
Baseball = 145 grams
Softball = 178 grams
 Velocity
= distance (centimeters)
divided by time (seconds)
 Momentum = mass x velocity
According
to Newton's
second law of motion, a
larger force acting on an
object causes a greater
________ of the object.
A
3,000-N force acts on
a 200-kg object. The
acceleration of the
object is ____.
 Two
objects that have the same
mass are dropped from a tall
building. One object is larger and
flatter than the other. Explain why
the larger, flatter object hits the
ground last.
True or False
Momentum is a property
of an object and can be
transferred from that
object to another object.
If gravity did NOT affect the path of a
horizontally thrown ball, the ball
would ____.
a. go straight up
b. travel horizontally
c. fall straight down
d. follow a curved path
 Bell
Ringer: Calculate the force on an
object that has a mass of 20 kg and an
acceleration of 15 m/s2.
 The
statement "to every action there is an
equal and opposite reaction" is ____.
 Bell
Ringer: A ball is attached to a string
and swung. If the string breaks at Point A,
in which direction will the ball be traveling
an instant later?