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Kinematics ( Definitions)

Kinematics ( Definitions). Aims Be able to recall the definitions of displacement, instantaneous speed, average speed, velocity & acceleration. Be able to describe the difference between displacement and distance. 3) Compare and contrast average speed cameras and GATSOs.

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Kinematics ( Definitions)

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  1. Kinematics ( Definitions) Aims Be able to recall the definitions of displacement, instantaneous speed, average speed, velocity & acceleration. Be able to describe the difference between displacement and distance. 3) Compare and contrast average speed cameras and GATSOs

  2. Kinematics ( Definitions) Displacement The distance travelled in a certain direction. Scale Drawings 100m ( 1cm) 300m ( 3cm)

  3. Kinematics ( Definitions) Instantaneous Speed Instantaneous speed is the speed at an instant in time. Distance Time

  4. Kinematics ( Definitions) Average Speed Average speed is the distance travelled by an object divided by the time taken to travel that distance. S = d/t

  5. Kinematics ( Definitions) • Find the definitions for Velocity & Acceleration. • What is the difference between average speed cameras & GATSO’s ?

  6. Kinematics ( Graphs) Aims • Be able to apply graphical methods to represent displacement, speed, velocity and acceleration; • Be able to determine velocity from the gradient of a displacement against time graph; • Be able to determine displacement from the area under a velocity against time graph; • Be able to determine acceleration from the gradient of a velocity against time graph.

  7. Kinematics ( Graphs)

  8. Kinematics ( Equations of Motion) Aims 1)Derive the equations of motion for constant acceleration in a straight line from a velocity against time graph. 2)Be able to select and use the equations of motion for constant acceleration in a straight line. 3) Apply the equations for constant acceleration in a straight line.

  9. Kinematics ( Equations of Motion) V U 0 0 t

  10. Kinematics ( Equations of Motion) 10m/s Slope = ? 0 4s t 0 Slope = 3m/s2 0 5s t 0

  11. Kinematics ( Equations of Motion) v = u + at When do we use this to solve problems ? 1) A car starts from rest and accelerates at 2m/s2 for 4 seconds . What will its final velocity be ? 2) A car accelerates from 15m/s to 25 m/s in 10 seconds . What is its acceleration? 3) How long will it take a car to accelerate at 5m/s2 from 10m/s to 32m/s ?

  12. Kinematics ( Equations of Motion) s =½(u + v)t When do we use this to solve problems ? 1) How far will a car travel when it accelerates from 8m/s to 20m/s in 8 seconds. ?

  13. Kinematics ( Equations of Motion) v2 =u2 + 2as When do we use this to solve problems ? 1) A car starts from rest and accelerates at 2m/s2 for 4 seconds, it covers 120m in this time . What will its final velocity be ? 2) A car decelerates from 30m/s to 10 m/s .It covers a distance of 150m whilst doing this . What is its deceleration? 3) How far will a car travel when it accelerates at 2m/s2 and increases its velocity from 17m/s to 34m/s.

  14. Kinematics ( Free Fall) 1) Apply the equations for constant acceleration to examine the motion of bodies falling in the Earth’s uniform gravitational field without air resistance; 2) Explain how experiments carried out by Galileo overturned Aristotle’s ideas of motion. 3) Describe an experiment to determine the acceleration of free fall g using a falling body;

  15. Kinematics ( Free Fall) What does this image tell us about an object in Free Fall ? What graphs could we plot ? What calculations could we do ?

  16. Kinematics ( Free Fall) Use the data below to plot 3 graphs. What do the graphs show?

  17. Kinematics ( Free Fall)

  18. Aristotle and Galileo Explain how experiments carried out by Galileo overturned Aristotle’s ideas of motion. Include a description of the inclined plane experiment. Galileo Aristotle

  19. What we have Covered Kinematics

  20. What we have Covered Linear Motion

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