1: Speed, Distance & Time

    Cards (44)

    • What is the difference between speed and velocity?
      Velocity includes direction; speed does not
    • How are speed and velocity measured?
      Both are measured in m/s, km/h, or mph
    • Can an object have constant speed and changing velocity?
      Yes, if it changes direction while maintaining speed
    • What is the formula for average speed?
      Average speed = Distance moved / Time taken
    • How do you calculate the average speed of a cat that moves 20 m in 35 s?
      Average speed = 20/35=20/35 =0.57 m/s 0.57 \text{ m/s}
    • How long does it take for the cat to skulk 75 m at 0.57 m/s?
      Time = 75/0.57=75/0.57 =132 s 132 \text{ s}
    • What is acceleration?
      Acceleration is how quickly velocity is changing
    • What units are used for acceleration?
      Acceleration is measured in m/s²
    • What does a negative acceleration value indicate?
      It indicates the object is slowing down
    • What is the formula for acceleration?
      Acceleration = Change in Velocity / Time taken
    • How do you calculate acceleration if an object changes from 2 m/s to 6 m/s in 5.6 s?
      Acceleration = (62)/5.6=(6-2)/5.6 =0.71 m/s² 0.71 \text{ m/s²}
    • What is the formula relating final velocity, initial velocity, acceleration, and distance?
      = + 2as
    • What is the final speed of a van decelerating from 23 m/s at 2.0 m/s² over 112 m?
      Final speed = 9 m/s9 \text{ m/s}
    • What does a distance-time graph show?
      It shows how far something has travelled
    • What does the gradient of a distance-time graph represent?
      The gradient represents the speed of the object
    • What do flat sections on a distance-time graph indicate?
      Flat sections indicate the object is stopped
    • What does a steeper graph on a distance-time graph indicate?
      A steeper graph indicates the object is going faster
    • What do curves on a distance-time graph represent?
      Curves represent acceleration of the object
    • How do you calculate average speed from a distance-time graph?
      Average speed = Total distance / Total time
    • What does a velocity-time graph show?
      It shows how an object's velocity changes over time
    • What does the gradient of a velocity-time graph represent?
      The gradient represents acceleration
    • What do flat sections on a velocity-time graph indicate?
      Flat sections indicate steady speed
    • What do uphill sections on a velocity-time graph represent?
      Uphill sections represent acceleration
    • What do downhill sections on a velocity-time graph represent?
      Downhill sections represent deceleration
    • What does the area under a velocity-time graph represent?
      The area represents the distance travelled
    • What is gravity?
      Gravity is the force of attraction between masses
    • How do you calculate the distance travelled in a time interval from a velocity-time graph?
      Distance = Area under the graph
    • What effect does gravity have on objects on a planet's surface?
      It makes all things accelerate towards the ground
    • What is the acceleration due to gravity on Earth?
      About 10 m/s²
    • How does weight differ from mass?
      Weight is caused by gravity; mass is not
    • Does an object's mass change on the Moon?
      No, mass remains the same everywhere
    • How is mass measured?
      Mass is measured in kilograms (kg)
    • How is weight measured?
      Weight is measured in newtons (N)
    • What is the formula relating weight, mass, and gravitational field strength?
      Weight = Mass x Gravitational field strength
    • What is the weight of a 5 kg mass on Earth?
      Weight = 5×10=5 \times 10 =50 N 50 \text{ N}
    • What is the weight of a 5 kg mass on the Moon?
      Weight = 5×1.6=5 \times 1.6 =8 N 8 \text{ N}
    • What are the key differences between mass and weight?
      • Mass is the amount of "stuff" in an object
      • Weight is the force of gravity on an object
      • Mass is constant; weight varies with gravity
      • Mass is measured in kg; weight in N
    • What are the effects of gravity on objects near a planet?
      • Causes objects to accelerate towards the ground
      • Gives objects weight
      • Keeps celestial bodies in orbit
    • What are the characteristics of distance-time graphs?
      • Gradient indicates speed
      • Flat sections indicate stopping
      • Steeper graphs indicate faster speeds
      • Curves indicate acceleration
    • What are the characteristics of velocity-time graphs?
      • Gradient indicates acceleration
      • Flat sections indicate steady speed
      • Uphill sections indicate acceleration
      • Downhill sections indicate deceleration
      • Area under the graph indicates distance travelled
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