2024 WA1 Physics Ch 1-2

• Explain average speed for an athelete whose average speed is 9.12m/s?

  -There are durations where the athlete is running faster than 9.12 m/s

  -There are some durations where he is running slower than 9.12 m/s

  -But for the whole journey, he is running 9.12 m/s as the average
• Explain uniform speed of 50 m/s

  When the change in the distance of 50 m travelled by the object per second is the same throughout...
• What does it mean when the velocity is negative?

  When the object moves in the opposite direction for (value) m/s, assuming the initial direction was positive
• When does an object undergo acceleration?

  object undergoes acceleration when:

  -its speed/direction changes

  -both its speed and direction changes
• What is non-uniform acceleration?

  When change in velocity of an object for every unit of time is not the same
• What does the gradient of a displacement-time graph give?

  velocity
• What does the gradient of a velocity-time graph give?

  acceleration
• Describe the motion

  at rest

  
• Describe the motion

  constant velocity of (value)

  
• Describe the motion

  moving with constant velocity of (value)

  
• Describe the motion

  moving with constant acceleration from rest

  
• Describe the motion

  moving with increasing velocity of (value)

  
• Describe the motion

  moving with an increasing acceleration from rest

  
• Describe the motion

  moving with decreasing velocity of

  
• describe the motion

  moving with decreasing acceleration

  
• describe the motion

  moving with constant velocity of (value)

  
• describe the motion

  moving with constant deceleration of (value)

  
• describe the motion

  moving with decreasing velocity

  
• describe the motion

  moving with decreasing deceleration

  
• Describe the motion

  moving with increasing velocity

  
• describe the motion

  moving with increasing deceleration

  
• how can displacement be found?

  by area of graph:

  -area of triangle

  
• How can displacement be found?

  by area of graph:

  -area of trapezium

  
• How can displacement be found?

  acceleration on gradient are the same

  
• describe the motion

  -From 0 to 5 seconds, the object returns to start point from 100 m at a constant velocity of 14 m/s

  -At 5 seconds, the object is at start point

  -From 5 to 7 seconds, the object crosses the start point and moves away from start point in same distance and same constant velocity for -50 m

  
• Describe the motion

  -From 0 to 5 seconds, the object returns to start point from 100 m at a constant velocity of 14 m/s

  -At 5 seconds, the object creates a u-turn at the start point

  -From 5 to 7 seconds, the object moves away from start point in the opposite direction with a constant velocity of 14 m/s for 100 m

  
• An object is thrown vertically upwards, what does it represent when velocity reaches 0m/s?

  The object reaching maximum height

  
• The higher the height, the lower the velocity
• What is the acceleration of free fall?

  10 m/s^2