Unit 1 Flashcards
Constant speed
Speed remains the same. It doesn’t decrease or increase.
Gradient
Represents speed on a distance time graph.
Flat gradient
Gradient is zero, speed is zero.
Straight gradient
Gradient is constant, speed is constant (steeper the gradient, greater the speed).
Curved gradient
Gradient changes, speed changes (accelerates/decelerates).
Average/constant speed equation
Speed= total distance travelled divided by total time taken. (m/s)
Acceleration and deceleration graph
Acceleration: curved line looking up.
Deceleration: curved line looking down.
Velocity
Speed in a given direction.
Constant velocity
An object moving at a constant speed along a straight line.
No constant velocity
An object moving steadily around a circle (no constant speed). Direction changes.
Can two moving objects have the same speed but different velocity?
Yes
Definition acceleration
An object with an increasing speed
Definition deceleration
Decreasing speed on an object
Acceleration equation
Acceleration = change in velocity divided by time taken for change. (m/s2)
What does the area under a graph represent?
Distance travelled
Acceleration of free fall
The acceleration of a freely falling body near to the Earth’s surface is constant.
Air resistance on objects on free fall is…
Negligible
Earth’s gravitational field decreases in…
Strength with increased height above the Earth’s surface.
What is the field strength of objects which their heights from falling are smaller than the Earth’s radius?
10m/s2
Air resistance in any falling objects…
Increases as it gains speed
If it continues to fall…
The increasing air resistance causes it to reach a constant speed (terminal velocity)
