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Speed, Velocity, Acceleration. BY: BRIANNA SHIELDS. DO NOW- Get hmwk out!. Complete the physics handout on front counter. GOAL. To interpret graphs and solve word problems involving speed, velocity, acceleration and momentum. Motion. Change in position during a time period

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do now get hmwk out
DO NOW- Get hmwk out!
  • Complete the physics handout on front counter
  • To interpret graphs and solve word problems involving speed, velocity, acceleration and momentum

Change in position during a time period

3 types of motion





1. Definition: Rate at which an object moves

2. Formula: Distance divided by time (d/t)

3. Units: m/s or km/s


4. Constant speed - speed that doesn’t change

5. Average speed- add speeds, divide by total number


6. Graphs:

Time: x-axis

Distance: y-axis

Constant speed

Changing speed

Copy samples of these into your notebook

cheetah speed graph
Cheetah Speed Graph
  • In one second how far had the cheetah run?
  • In three seconds how far had the cheetah run?
  • What was the cheetah’s average speed?
bicycle graph
Bicycle Graph
  • After one hour how far had she traveled?
  • Two hours?
  • Three hours?
  • Four hours?
  • Is she traveling at a constant speed? Why/why not
  • During which hours was her speed the greatest?
  • What does the flat line on the graph indicate?
calculating speed example
Calculating Speed: Example
  • If 2 runners ran the same distance (10km) but one completed it in 3600 seconds and the other in 2800 seconds, what were each of their average speeds?
  • 1: d/t 10km/3600 sec .00278 km/sec
  • 2: d/t 10 km/ 2800 sec .00357 km/sec
  • Runner 2 has greatest average speed!
calculating speed example13
Calculating Speed: Example
  • Spirit of Australia, a hydroplane boat, made speed records by traveling 239 miles in 0.75 hours (45 minutes). What is it’s record breaking speed?
  • d/t 239 miles/ 0.75 hr

1. Definition: Describes speed plus direction (n, s, e, w)

2. Formula: D/T plus direction

3. Units: m/s or km/s, north, south, east or west


4. Velocities can be combined

Add velocities when in same direction

Velocities in opposite direction= subtract


5. Graphs:

Time: x-axis

Distance: y-axis

(same as speed graphs but also has direction)

calculating velocity example
Calculating Velocity: Example
  • If a runner is running east at 10 m/s sec, what is her velocity?
  • 10 m/s east
calculating velocity example18
Calculating Velocity: Example
  • If you’re rowing a boat downstream at 16 km/hr, and the curren is moving at 10 km/hr. How fast does the boat “look” like it’s going to someone on shore? (Draw a picture too!)
  • 16 + 10
  • 26 km/hr downstream
calculating velocity example19
Calculating Velocity: Example
  • If you’re rowing a boat upstream at 15 km/hr, against a current moving at 8 km/hr. What is you’re actual velocity to an observer on the shore?
  • 15-8
  • 7 km/hr upstream
calculating velocity example20
Calculating Velocity: Example
  • If you are running up an escalator at 2 steps per second and its moving downward at 3 steps per second, what is the total velocity? In what way are you moving?
  • 3-2
  • -1 (you are actually moving backwards, down the escalator, although you’re running up it)

1. Definition: Rate of change in velocity

Speeding up, slowing down, changing direction

2. Formula: Final velocity minus original velocity, divided by time

3. Units: m/s/s or km/s/s


4. Increasing velocity - positive acceleration

5. Decreasing velocity - negative acceleration- deceleration


6. Graphs

X- axis- time

Y-axis- distance

Object must be changing velocity

Line, is smooth and curved (not straight)- “changing line”

acceleration graph race car
Acceleration Graph- Race Car
  • 1. From 0-1 sec how far did the race car go?
  • 2. From 1-2 sec?
  • 3. From 2-3 sec?
  • 4. Is the car accelerating or decelerating? Explain.
calculating acceleration example
Calculating Acceleration: Example
  • A roller coaster’s velocity at the top of a hill is 10m/s. Two sec later it reaches the bottom of the hill with a velocity of 26 m/s. What is the acceleration of the roller coaster?
  • Vf-Vo




8 m/s/s

calculating acceleration example30
Calculating Acceleration: Example
  • A roller coaster’s velocity at the bottom of a hill is 25 m/s. Three seconds later it reaches the top of the next hill, moving at 10 m/s. What is the deceleration of the roller coaster?
  • A = Vf-Vo


A = 10-25 = -7.5 m/s/s


calculating acceleration example31
Calculating Acceleration: Example
  • A car is traveling at 60 km/hr. It accelerates to 85 km/hr in 5 seconds. What is the acceleration of the car?
  • A = Vf-Vo


A = 85-60 = 5.0 m/s/s



1. Definition: Depends on object’s mass and velocity

Related to force upon impact

2. Formula: Mass x velocity

3. Units: Kg.m/s

calculating momentum examples
Calculating Momentum: Examples
  • If 2 football players are running at the same velocity towards an opponent. Player 1 weighed 170 lbs, player 2 weighed 250 lbs. Who is going to move the opponent farther? Why?
  • Since both players were traveling at the same velocity, the larger player will have more momentum, thus, moving the opponent farther
calculating momentum examples37
Calculating Momentum: Examples
  • Why would it be harder to stop a car traveling at 65 miles/ hr than it is to stop one traveling at 35 miles/hr? Explain
  • If they have approximately the same mass, the faster car will gather more momentum, according to the equation: momentum = mass x velocity
calculating momentum examples38
Calculating Momentum: Examples
  • What is the momentum of a 0.3 kg bluejay running into a window while flying at 17 m/s?
  • momentum = mass x velocity
  • = 0.3 x 17 = 5.1 kg m/s
  • Fear of Physics
  • Write the homework assignment into your agenda:
    • Practicing Motion