3.1-3.8 Motion Quizlet Cards Flashcards
What is displacement?
The distance of an object from a point in a specific direction (vector)
What is velocity?
Rate of change of displacement (vector) ∆s/∆t if constant
What is speed?
Change in distance travelled per unit time (scalar)
What is acceleration?
Rate of change of velocity (vector) ∆v/∆t if constant
What are the units of acceleration?
ms⁻²
What is meant by constant velocity/uniform motion?
Speed and direction of motion don’t change
What is represented by the gradient of a distance-time graph?
Speed
What is represented by the gradient of a displacement-time graph?
Velocity
What is represented by the gradient of a velocity-time graph?
Acceleration
What is represented by the area under a velocity-time graph?
Change in displacement
What is represented by the area under an acceleration-time graph?
Change in velocity
When can the SUVAT equations by used?
When there is constant acceleration and motion along a straight line.
What is the effect of mass on the acceleration for an object in free-fall?
None
What is the relationship between displacement and time for an object falling freely from rest?
Displacement is proportional to time squared (sαt²)
What is a projectile
An object acted upon only by the force of gravity
What shape is the path of a projectile?
Parabolic
What is the initial vertical velocity of an object projected horizontally?
Zero
What angle of projection that results in maximum range
45°
Ignoring air resistance what is the acceleration of a projectile?
Always g downwards
How does horizontal velocity vary in projectile motion?
It is constant
If a projectile returns to its starting height
Initial and final velocities have the same magnitude
What equation used for the horizontal component of projectile motion?
Displacement = Velocity x time (since horizontal velocity is constant)
What aspect links the vertical and horizontal motion of a projectile
Time taken to fall
Why can SUVAT equations can be used for the vertical component of projectile motion
Since the motion is in a single direction with a constant acceleration
What is the vertical velocity at the peak of projectile motion?
Zero
