Acceleration Velocity Time Graphs Acceleration l Rate at

Acceleration Velocity – Time Graphs

Acceleration: l Rate at which the velocity increases or decreases l Units: m/s 2 or km/h/s

• Constant velocity • Increasing velocity 2 • Acceleration = 0 m/s Velocity-Time • Acceleration constant Graphs: • Uniform Motion • Non-uniform Motion v (m/s) t (s) Area Under the Curve = Displacement Slope = Acceleration t (s)

The following shows the motion of a car. v (m/s) 40 30 20 10 5 10 15 20 t (s) What is the displacement of the car? What is the acceleration of the car? Is this an ex. of uniform motion? No 400 m 2 m/s 2

What is the displacement of the runner? 132 m The following graph shows the motion What is acceleration of the of a cross-country runner training for a race. 2 runner from 4 s to 10 s? 0 m/s What is acceleration of the runner from 10 s to 16 s? -2 m/s 2 Slows down/deceleration OR Acceleration in opposite direction

– 60 m The graph below represents the velocity of a What is the displacement of the cyclist from cyclist. the 12 th to 20 th second? 20 m 80 m

A Camaro can go from 0 km/h [N] to 100 km/h [N] in 5. 3 s. What is the acceleration?

Jamaican sprinter Usain Bolt ran the 100 m at an average velocity of 37 km/h in 9. 69 s at the Beijing Olympics. What was his average acceleration?

A boy rolls a ball up a hill giving it a velocity of 4. 5 m/s[N]. Five seconds later the ball is Must rolling down the hill with a velocity of consider 1. 5 m/s[S]. direction!!! What is the ball’s acceleration?