1 Movement and position Flashcards
What kind of journey do distance-time graph represent?
An object travelling on a straight line.
Which axis is distance on?
y.
Which axis is time on?
x.
What does this represent?
Acceleration.
What does this represent?
Stationary.
What does this represent?
Deceleration.
What does this represent?
It has a negative gradient - it is travelling to the place where it first came from.
What does this represent?
Constant speed.
How do we find out the speed?
Using the gradient.
How do we find the gradient?
Distance travelled / time taken
What are the steps we take to find out the speed on a curved line?
- Put a dot on the speed that you want to find.
- Draw a tangent (should be as large as we can make it)
- Find the gradient (rise/run).
How do you calculate average speed (v)?
Distance moved / time taken
What is the triangle for average speed?
What is displacement?
The distance moved in a straight line, in a given direction, from the starting point.
How do you investigate the motion of everyday objects such as toy cars or tennis balls?
- Put a toy car on a table with a pulley at the end of the table.
- The toy car and slotted masses should be attached to the pulley with a string
- Time stop watch as the car moves.
- Repeat the experiment with different distances (0.2m, 0.4m, 0.6m)
- Repeat each distance at least three times to obtain 3 sets of timings.
- Get an average of the time and plot a graph.
- S = D / T
What is the equation used for acceleration?
Acceleration = final velocity - initial velocity /
time taken
What is the triangle for the equation for acceleration?
How do you use the equation for acceleration as deceleration?
Initial velocity: 0
Final velocity: x
Time taken: y
How can we tell that an object is accelerating when it is moving through timed intervals?
The distance travelled in equal time intervals increased, showing that the object was travelling faster as time passed.
What is non-uniform acceleration?
It means that it’s not steady as it changes from instant to instant.
What do velocity-time graphs show?
How an objects velocity changes over time.
Which axis is velocity on a velocity-time graph?
y
Which axis is distance on a velocity-time graph?
x
What tells you the acceleration on a velocity-time graph?
The gradient.
What does this represent?
The rate of acceleration is increasing.
What does this represent?
Constant acceleration.
What does this represent?
Constant deceleration.
What does this represent?
Constant velocity.
What is constant velocity?
There is no acceleration (Isn’t decreasing or increasing).
How do you find the velocity when the line is flat?
You look at the corresponding number on the y-axis.
How do you find the distance travelled on a v-t graph?
The area under the graph (line).
How do you find out the average velocity?
Initial velocity + Final velocity /
2
What is the equation of uniformly accelerated motion?
v^2 = u^2 + 2as
What is the initial velocity?
It is the velocity at which the object possesses a tthe start. = 0
What is the final velocity?
Measures the speed and direction of a moving body after it has reached its maximum acceleration.
