Motions physics Flashcards
What is the formula for speed?
Speed = distance/time
What’s the difference between speed and velocity?
Speed is scaler and velocity is a vector because it includes direction
What is distance?
Length of the path
Si unit is meters (m)
What is the formula for velocity?
Velocity = displacement/time
What is average speed?
Total distance traveled/total time taken
In a distance time graph, what does the gradient represent?
Gradiant represents speed
We calculate it with the formula
Y2-Y1/X2-X1
What does it mean in a distance time graph when: Gradient is increasing Gradient is decreasing Gradient doesn't change Gradient = 0
When the gradient is increasing it shows accelaration
What gradient decreases it means deceleration
When gradient is constant is shows constant speed
If gradient 0 then speed also = 0
How do you find accelaration?
V-U/T
final velocity-initial velocity/time = acceleration/deceleration
How do you find change in velocity?
V-U
final velocity - initial velocity = change in velocity
What does the gradient of a speed time graph represent?
It shows us accelaration.
What does the area underneath the graph represent?
It shows us the distance travelled
What can different gradients mean in a speed time graph?
A straight positive/negative line shows constant/uniform accelaration/deceleration
A horizontal line shows constant speed
And a curved line can show reducing accelaration etc.
How do you identify if an object is stationary on a speed time vs distance time graph?
In speed time the line should be horizontal at 0 and for a distance time it can be horizontal at any point
What is terminal velocity?
When an object continues to fall at constant speed due to weight being equal to air resistance
- Not comeplete What is acceleration due to free fall?
What is a vacuum?
A space that doesn’t contain any particles
What happens when we drop items in a vacuum?
The objects accelerate due to free fall and accelerate at constant speed as weight is the only factor that affects it
What is mass?
The amount of matter in an object
What is the SI unit of mass
kg
What is weight, and what is its SI unit
A force determined by mass and gravitational field strength
SI unit is Newtons (N)
What is the formula for weight?
Weight = Mass * Gravity
