3. motion Flashcards
What is speed?
Rate of change of distance, ms-1
What is displacement?
Distance an object has travelled in a given direction
What is velocity?
Rate of change of displacement, or speed in a given direction, vector, ms-1
What is acceleration?
Rate of change of velocity, vector, ms-2
What does a straight horizontal line represent on a displacement-time graph?
Stationary object
What does a line with a constant, non-zero gradient represent on a displacement-time graph?
Moving with constant velocity
What does a curved line represent on a displacement-time graph?
Acceleration or deceleration
What does a straight horizontal line represent on a velocity-time graph?
Object moving with constant velocity
What does a line with a constant non-zero gradient represent on a velocity-time graph?
Acceleration or deceleration
What does the area under a velocity-time graph represent?
Displacement
What does the area under an acceleration-time graph represent?
Velocity
How can terminal velocity of an object be determined using light gates?
Set up light gates vertically and measure distance between them. Connect them with a data logger and release object from rest, measuring time taken to travel between two gates. Usually the time and the known distance, you can calculate the velocity of the falling object.
What is ‘g’?
Acceleration of free fall, acceleration of an object in response to gravitational attraction
Describe an experiment to calculate the value of g.
Electromagnet holds a steel ball suspended at a measured distance above a surface. Start timer when the electromagnet is deactivated, stop when the surface is hit. u=0 and distance and time is known so use SUVAT equation s = ut + 1/2 at2
Does horizontal velocity change in projectile motion?
No
What is vertical acceleration in projectile motion?
Gravitational field strength downwards
