Average Acceleration
What is the formula for average acceleration?
Final Velocity - Initial Velocity / Time
What does instantaneous velocity mean?
The velocity at a specific moment in time.
What does the slope of a position time graph represent?
Velocity
Define average speed.
Total distance / total time.
Why can displacement be zero even if distance is not?
Because you can return to your starting point.
A car goes from 10 m/s to 30 m/s in 5 s. What is its acceleration?
4 m/s squared
How is instantaneous velocity different from average velocity?
Instantaneous is at one moment, average is over a time interval.
A flat line means what about Motion?
No movement. object is at rest.
Define velocity.
Speed with direction.
Explain why velocity is positive in one direction and negative in another.
Direction determines the sign of velocty.
If acceleration is zero what does that mean about velocity?
Velocity is constant
On a graph, how do you find instantaneous velocity?
By finding the slope of the tangent line.
If a line slopes downward, what does that mean?
The object is returning towards the starting point.
A car goes 120 km in 2 hours. What is the velocity?
60 km/h
How can a car accelerate if its speed stays the same?
By changing direction (turning)
A train slows from 40 m/s to 10 m/s in 15 s. Fins the acceleration.
-2 m/s squared
A runner's position time graph shows a steep slope at 3 seconds. What does this mean about velocity?
The runner was moving quickly at that moment.
A line goes from (0,0) to 5,25). What is the velocity?
5 m/s
A plane travels 400 km north in 2 hours. What is the velocity?
200 km/h north
Give an example of negative acceleration in everyday life
Pressing the brakes in a car.
Why is acceleration a vector not a scalar?
Because it incudes both magnitude and direction.
What a real world example of where instantaneous velocity is more useful than average velocity?
A car's speedometer reading.
Explain how you can tell if an object is accelerating just by looking at a position time graph.
The slope curves (not straight) - it gets steeper or shallower over time.
Compare how speed and velocity would describe running around a circular track.
Speed stays constant, velocity changes because direction changes.
If two cars have the same acceleration but different starting velocities, what happens?
Their velocities change at the same rate, but they may not be equal at the same time.