Motion Flashcards
(19 cards)
The steeper the line?
The greater speed it represents
Speed equals?
D/t
What’s the speed of a runner who covers 400m in 50s?
8m/s
Distance and time are on what axis?
Distance- y
Time- x
If an object is stationary the line on the DT graph is?
Horizontal
If the velocity of an object changes we say that it ………?
Accelerates
The velocity of an object is…?
It’s speed in a given direction
What’s the difference between speed and velocity?
Velocity is speed in a particular direction
What’s the unit for acceleration ?
m/s2
If the value calculated for acceleration is negative what does that mean?
The body is decelerating - same as negative acceleration
If the line on a velocity time graph is horizontal the acceleration is?
Zero
What does the area under the line on a velocity time graph represent?
The distance travelled in the given time
On a VT graph is the object is decelerating what will the line look like?
Negative
How do you calculate the acceleration of an object on a VT graph?
Work out the gradient of the line
How do you calculate the speed of an object on a DT graph?
Work out gradient
What does an upwardly curving line represent on a
DT graph
VT graph
?
Increasing velocity
Increasing acceleration
How can an object travelling at a steady speed be accelerating?
By changing it’s direction
A car accelerates from rest to a speed of 40m/s in 10s. What’s its acceleration?
4m/s2
What does the gradient on a DT graph represent?
An objects speed
