Distance, speed and acceleration

• Scalar quantities have magnitude size only.
• Vector quantities have both magnitude and direction
• Force is a vector quantity
• Speed is a scalar quantity
• Displacement is a vector quantity
• Velocity is a vector quantity
• Distance is a scalar quantity
• Distance travelled is a scalar quantity
• Acceleration is a vector quantity
• The formula to calculate the average velocity is distance/time
• Distance travelled = displacement + distance travelled along path
• The formula for distance travelled = average velocity x time taken
• Time is a scalar quantity
• Average velocity = total displacement / number of intervals
• The average velocity is the total displacement divided by time taken to travel that displacement
• Mass is a scalar quantity
• speed = time/distance ​
• velocity= time / displacement​
• acceleration = change in velocity / time taken to make that change​
• Acceleration is measured in m/s2
• What can be predicted by analyzing the forces acting on an object?

  The motion of the object
• What is the effect of balanced forces on an object?

  They have no effect
• What can unbalanced forces lead to?

  A change in acceleration
• What can forces change about an object?

  Position, shape, or motion
• What does the direction of movement differentiate between?

  Scalar and vector measurements
• What is a scalar quantity?

  A quantity requiring only size
• What is a vector quantity?

  A measurement with size and direction
• What is speed a measure of?

  How fast something is travelling
• How is speed calculated?

  Distance travelled in unit time
• What are the units for speed?

  m/s or km/h
• How can speed, distance, and time be calculated using the DST triangle?

  Cover the letter to find the formula
• If a car travels 24 m in 2 seconds, what is its speed?

  12 m/s
• What is the difference between velocity and speed?

  Velocity has a direction
• What is the formula for velocity?

  $\text{velocity}=$$\frac{\text{displacement}}{\text{time}}$
• What is displacement?

  The distance moved in a straight line
• What is the formula for speed?

  $\text{speed}=$$\frac{\text{distance travelled}}{\text{time taken}}$
• If a car travels 24 m east in 3 seconds, what is its velocity?

  8 m/s east
• What is your speed if you walk around the house in 20 seconds?

  2 m/s
• Why is your velocity zero after walking around the house?

  Your displacement is nothing
• What are scalar measurements?

  Measurements with magnitude only