P2.1: Motion Flashcards
What is distance?
a measure of how far an object moves
What does distance not take into account?
Direction
What can be more effective than a timer?
Light gate - a timer starts and stops when an object interrupts a light beam
Why is a timer less effective than a lightgate?
greater precision
continuous measurements
What is speed?
The distance travelled per unit time
What type of quantities are distance and speed?
Scalar quantities
Why is velocity more useful?
Considers speed and direction
What are scalar quantities?
Only numbers
What are vector quantities?
Numbers and direction
What are examples of scalar quantities?
Speed
Distance
Mass
Time
What are examples of vector quantities?
Velocity
Displacement
Force
Acceleration
What is the formula involving speed, distance and time?
Distance = speed x time
How can you convert km into m?
Multiply by 1000
How many metres are there in a mile?
1609
How many seconds are there in an our?
3600
What is used to represent a vector quantity?
An arrow, the length depending on magnitude and direction depending on direction
What is displacement?
The difference in distance between your start point and end point
15m/s south
Is this a vector or scalar?
Vector, it accounts for direction
15m/s
Is this a vector or scalar?
Scalar, does not account for direction
What happens if a velocity is in the opposite direction?
Negative
What is acceleration?
The change in velocity per second
What can a change in velocity be?
A change in speed OR a change in direction
How do you calculate average speed?
Total distance (m) / total time (s)
What is the formula for acceleration?
Change in velocity (m/s) / time (s)
What does m/s2 mean?
M/s per second
An acceleration of 5m/s2 means that the speed increases by 5m/s each second
What SHOULD you say rather than deceleration?
Negative acceleration
How do you calculate change in velocity?
Final velocity (m/s) - intial velocity (m/s)
What does a distance time graph tell you?
The speed of an object throughout its journey, or how much distance is covered as time goes on
What does the gradient on a Distance time graph tell you?
Speed
What is the gradient of the line equal to on a velocity time graph?
Acceleration of the object
How can you calculate displacement from a velocity time graph?
Counting squares
Using triangles or rectangles
What equation is applied to objects with a uniform acceleration?
(Final velocity)2 - (intial velocity)2 = 2 x acceleration x distance
What is the formula of kinetic energy?
Kinetic energy = 0.5 x mass x speed
How can you calculate distance from a velocity time graph?
Area beneath the graph
What is the usual gravity acceleration?
10m/s
