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1. UNIT 3. MOTION IN ONE DIMENSION

2. How fast you can run?
Research suggest that human being could run as fast 40 mile/hour. But
the speed average to closer to 12-25MPH
LET’S WATCH LIST OF THE FASTEST ANIMAL ON EARTH
List the animals run fastest that you know.
Do you know which animal is the fastest?

3. UNIT 3. MOTION IN ONE DIMENSION
1.What is the motion, distance?
2.Speed and velocity
3.Average velocity and Instantaneous velocity
4.Acceleration
5.Equation of motion
6.Description of motion

4. 1. What is the motion and distance?
The motion is any physical movement or change in position
or place.
Distance = how far an object has moved.
The popular measurement of distance is meters or kilometers.
Displacement = the distance of a body’s change in position
from a starting point.
What is the difference between distance and displacement?

5. 2. What is the difference between speed and velocity?
Speed = the distance an object travels per unit time
Speed equation = [distance]÷[time] ( 𝑣 =
𝑠
𝑡
)
EX1: A car travels a distance of 50m in 10sec. What is the
scar’s speed? 5 m/s
EX1: An elevator travels from the first floor to the 26th
floor of a building in 40seconds. the distance of each floor is
4 meters. What is the elevator's speed?
2,5 m/p

6. Velocity is a measure of the speed of an object and the direction it is
moving in space.
On the escalator, passengers are
moving at the same constant
speed, but they are moving in
different directions.
Velocity can change even if speed
is remaining constant (you just
change direction).

7. EX3. If a person is working at 4m/s,
how far can he travels in one a half
minutes?
EX5. A chicken runs across the street at a speed
of 12m/s. If the road is 36 meters across, how
long does it take for the chicken to cross the
road?
EX4. A spaceship can move 100 meters in
2seconds. What is the ship's velocity?
50 m/s
3 seconds
360 meters

8. 3. Average speed and Instantaneous speed
Average speed = [total distance traveled]÷[time taken]
Instantanneous speed = [ distance traveled]÷[time taken]
( the time taken is very short)
Constant speed means that the speed stays the same throughout the entire
distance.
Changing speed means that the speed changes in the processing moving object.
Constant speed VS Changing speed
Basic on the definition as above, let’s me know what
is the average velocity?

9. Graphs present the speed of bus
1. Between what points is the
bus accelerating? _____ & ____
2. Between what points is the
bus moving at a constant speed?
_____ & _____
3. Between what points is the
bus stopped? __________
4. Between what points it the
bus decelerating? _________
OA DE
AB EF
CD
BC

10. 3. Accelaration Acceleration = the rate of change of velocity

11. How many kind of acceleration ?
Change in Velocity = final velocity (Vf) - initial velocity (Vi)
acceleration = [Vf - Vi]÷[time]
Change in velocity is often written as the triangle indicates "change" :
The formula: 𝒂 =
𝜟𝒗
𝜟𝒕
* If a car moves at a constant velocity, then its acceleration is zero
 Positive acceleration = speeding up
 Negative acceleration = slowing down

12. 0 m/s
80 m/s
0 m/
a =
80−0
20
= 4𝑚/𝑠2
Practice Calculations
Problem 1. A plane travels in a single
direction on a runway. It reaches the
end of the runway in 20 seconds
and its velocity is 80 m/s. What is its
acceleration?
What is the Vf? _____
What is the Vi? _____
Time taken 20 s
Have you ever been on a plane yet ?

13. 4 m/s
0 m/s
0 m/
a =
0−8
4
= −2𝑚/𝑠2
Problem 2. A skateboarder is traveling at
8 m/s. He slows and comes to a stop in 4
sec. What was the acceleration?
(hint: it is a negative number)
What is the Vf? _____
What is the Vi? _____
Time taken 4s
Do you want to play skateboard ?

14. 12 m/s
18 m/s 0 m/
a =
18−12
10
= 0,6𝑚/𝑠2
10s
Problem 3. A sailboat is moving at
12m/s when a gust of wind
changes its velocity to 18 m/s. The
wind lasts 10 seconds. For that 10
sec, what was its acceleration?
What is the Vf? _____
What is the Vi? _____
Time taken
Where is the landscape in this picture ?

15. 1. Motion indicates a change in _____________
2. Motion is relative to a ______________________
3. Acceleration is a change in ____________
4. Speed = distance / ?
5. Acceleration = ?
5. Velocity is a measure of an object's speed and
Its __________________
7. The triangle in the equation represents ________
8. If you are slowing down, then you have a ____________
9. A boat moves 100 meters in 25 seconds. What is the
boat's velocity

16. THINK ABOUT THIS…..
1. What are three ways to change the velocity of a car?
2. Why do highways have speed limits and not velocity limits?
3. What are three ways to change the velocity of a car?

17. Position
Speed
Time

18. MOTION IN ONE DIMENSION
PHYSICS 10 GRADE