C.Booklet # 30
Name
Period
Unit # 2
Date
Nov 10, 2015 (Tuesday)
Topic: Essay Writing Activity at Library.
Items
Points
Do-now
25%
Taking note
25%
Assessment
25%
Homework
25%
You have earned
Your score
#1
Do
Now
(9:05-9:15)
Independent research: Write the properties of Kinematics
#
Name
1
Definition & Example
Change of position of an object with respect of time
Motion
2
Distance
Distance is a numerical description of how far
apart objects is. It’s a scalar quantity which SI
unit is (meter)
The shortest distance between two points. It’s a vector
quantity which SI unit is: Meter
3
Displacement
4
Time
5
Time in physics is defined by its measurement: time is
What a clock reads. It’s a scalar quantity and SI unit is
Second
Speed
In everyday use and in Kinematics, the speed of an object is
the Magnitude of its Velocity. it is thus a Scalar quantity
6
Velocity
The velocity of an object is the Rate of change of its position with
respect to a Reference Point and is a function of time.
7
Acceleration
Acceleration is the Rate of change Velocity of an object.
1
#2
Write the properties of Dynamics
Library activity
# IV
(9:15 to 9:20)
#1
Properties
Definition and example
Force
A force can cause an object with Mass to change
its Velocity
Torque
Just as a force is a push or a pull, a torque can be
thought of as a twist to an object. Loosely speaking,
torque is a measure of the turning force on an object
such as a bolt. For example, pushing or pulling the
handle of a wrench connected to a nut or bolt produces
a torque (turning force) that loosens or tightens the
nut or bolt.
#3
Newton 3 Laws of Motion & examples
2
Law 1:
An object at rest will remain at rest unless acted on by an unbalanced
force. An object in motion continues in motion with the same speed and
in the same direction unless acted upon by an unbalanced force.
This law is often called
"the law of inertia".
Law #2:
Acceleration is produced when a force acts on a mass. The greater the
mass (of the object being accelerated) the greater the amount of force
needed (to accelerate the object).
Law # 3
This means that for every force there is a reaction force that is equal in
size, but opposite in direction. That is to say that whenever an object
pushes another object it gets pushed back in the opposite direction
equally hard
#4
Four Kinematics Equations
3
#5
Worksheet # 1
Return to #238
Alex is approaching a stoplight moving with a velocity of +30.0 m/s. The light
turns yellow, and Alex applies the brakes and skids to a stop. If Alex
acceleration is -8.00 m/s2, then determine the displacement of the car during
the skidding process. (Note that the direction of the velocity and the
acceleration vectors are denoted by a + and a - sign.)
Diagram:
Given:
Find:
vi = +30.0 m/s
vf = 0 m/s
d = ??
a = - 8.00 m/s2
vf2 = vi2 + 2 • a • d
4
(0 m/s)2 = (30.0 m/s)2 + 2 • (-8.00 m/s2) • d
0 m2/s2 = 900 m2/s2 + (-16.0 m/s2) • d
(16.0 m/s2) • d = 900 m2/s2 - 0 m2/s2
(16.0 m/s2)*d = 900 m2/s2
d = (900 m2/s2)/ (16.0 m/s2)
d = (900 m2/s2)/ (16.0 m/s2)
d = 56.3 m
#6
Assessment:
5
Joan is waiting at a stoplight. When it finally turns green, Joun accelerated from rest at
a rate of a 6.00 m/s2 for a time of 4.10 seconds. Determine the displacement of Joun
car during this time period.
Diagram:
Given:
Find:
vi = 0 m/s
t = 4.10 s
a = 6.00 m/s2
d = vi • t + ½ • a • t 2
d = (0 m/s) • (4.1 s) + ½ • (6.00 m/s2) • (4.10 s)2
d = (0 m) + ½ • (6.00 m/s2) • (16.81 s2)
d = 0 m + 50.43 m
d = 50.4 m
6
#7
Homework: Solve the problem below
Alex is approaching a stoplight moving with a velocity of +40.0 m/s. The light turns
yellow, and Alex applies the brakes and skids to a stop. If Alex acceleration is -10.00
m/s2, then determine the displacement of the car during the skidding process. (Note
that the direction of the velocity and the acceleration vectors are denoted by a + and a
- sign.)
7