Linear Motion Flashcards
Define linear motion
Motion in a straight or curved line with all body parts moving at the same speed in the same direction at the same time (eg - skiing)
How is linear motion created
Linear motion is created by a direct force which is passed through the centre of mass of the body
Define distance and what its measured in
- The length of the path taken by a body moving from one position to another
- Measured in metres (m)
Define displacement and what it is measured in
- The shortest straight line route between two positions
2. Measured in metres (m)
Define speed and what is it measured in
- The movement of a body per unit of time (no reference to direction)
- Measured in metres per second (m/s)
What is the calculation for speed
Speed = distance / time
Define velocity and what it is measured in
- The rate of change in displacement
2. Measured in metres per second (m/s)
How do you work out velocity
Velocity = displacement / time
Define acceleration/deceleration and what it is measured in
- The rate of change in velocity
2. Measured in metres per second squared (m/s^2)
What is the calculation for acceleration/deceleration
Change in velocity / time taken
On a distance time graph, what does a horizontal line show
A stationary body
On a distance time graph, what does a straight line with a positive gradient show
Constant velocity
On a distance time graph, what does a curved line with a decreasing gradient show
A decrease in speed
On a distance time graph, what does a curved line with an increasing gradient show
Increasing speed
Which axis does time go on velocity time and distance time graphs
Speed goes along the x axis
On a distance time graph, which axis does distance go on
Distance goes on the y axis
On a speed/velocity time graph, which axis does speed go on
Speed goes on the y axis
On a speed/velocity time graph, what does a line with no gradient show
Constant speed
On a speed/velocity time graph, what does a line with a positive gradient show
Acceleration
On a speed/velocity time graph, what does a strength line with a decreasing gradient show
Deceleration
On a speed/velocity time graph, what does a line with a positive to no gradient line show
Acceleration to a constant speed
On a velocity time graph, what does a line with an increasing negative velocity show (below 0)
Acceleration in a different direction
On a velocity time graph, what does a line with a decreasing negative velocity show (below 0)
Deceleration in the opposite direction
