Speed Velocity Acceleration Chapter 39 Speed The speed

Speed • The speed of an object is the distance it travels in unit

Different speeds • Below are some examples of different speeds: · Speed of a

Velocity • Velocity is speed in a given direction. i. e. 10 m/s due

Acceleration. • Acceleration is the change in velocity per second. (Units m/s 2) The

Draw a graph of the following table i. iii. iv. v. Which walker is

Answers. (i) Walker A (ii) 5. 5 sec (iii) 2. 5 m (iv) The

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Speed, Velocity, Acceleration Chapter 39

Speed • The speed of an object is the distance it travels in unit time(units : m/s). Speed = Distance Time

Different speeds • Below are some examples of different speeds: · Speed of a common snail = 0. 0036 km/h (0. 0023 mph) · A brisk walk = 6 km/h (3. 75 mph) • Olympic sprinters = 36 km/h (22. 5 mph) (average speed over 100 metres) · Speed limit on a French autoroute = 130 km/h (80 mph) · Top cruising speed of a Boeing 747 -400 = 913 km/h (567 mph) · Official air speed record = 3, 529 km/h (2, 188 mph) · Space shuttle on re-entry = 28, 000 km/h (17, 500 mph

Velocity • Velocity is speed in a given direction. i. e. 10 m/s due south.

Acceleration. • Acceleration is the change in velocity per second. (Units m/s 2) The velocity of a car changes from 9 m/s to 27 m/s in 6 s. What is its acceleration? Answer: Acceleration = Final velocity – Initial velocity Time taken = 27 m/s - 9 m/s 6 s = 3 m/s/s.

Draw a graph of the following table i. iii. iv. v. Which walker is going faster? How long does it take for walker B to 11 m? How far apart are the walkers after 2. 5 Is the speed of walker A constant? What is the speed of each walker? travel sec?

Answers. (i) Walker A (ii) 5. 5 sec (iii) 2. 5 m (iv) The graph for walker A is a straight line. Therefore A’s speed is a constant. (v)Walker A Speed = Distance 21 Time 7 = 3 m/s Walker B Speed = Distance 12 Time 6 = 2 m/s

Distance time Graph