Linear Motion Flashcards
What is a scalar quantity?
When measurements are only described in terms of size or magnitude. Mass, distance and speed.
What is a vector quantity?
When measurements are described in terms of magnitude and direction. Weight, Acceleration, displacement, velocity and momentum.
In vector diagrams what do the arrows represent?
The length of the arrow shows magnitudethe longer the arrow the bigger the size.
The direction of the arrow shows the line of application.
Calculate the average speed and the average velocities for the components of the triathlon.
1.5km Swim, Time 30mins 30secs, Displacement 1.5km
40km Cycle, Time 90mins, Displacement 0.0km
10km run, Time 45mins Displacement 0.2Km.
Swim Average speed 0.82 m/s Av Velocity 0.82m/s
Cycle Av Speed 7.41m/s, Av Velocity 0.0m/s
Run Av Speed 3.7 m/s, Av Velocity 0.07m/s
Define Mass and how is it measured
The quantity of matter the body pocesses. Measured in KG
Define weight and how is it measured
Weight is the force on a given mass due to graviity. Measured in Newtons (N)
Mass x Gravity = weight (N)
What is the difference between Distance and displacement?
Distance is the path a body takes as it moves form starting to the finishing position Measured in Metres. Displacemnet is the shortest route in a staright line between the starting and finishing point. Measured in Metres.
How do you calculate the following? Speed Velocity Acceleration Momentum
Speed (m/s) = Distance covered (m) Divided by time taken(s)
Velocity(m/s) = Dispalcement(m) divided by time taken (s)
Acceleration= Change in velocity(m/s) divided by tiema taken(s)
Momemtum= mass x velocity
What is a force and what are the two types acting on a performer during linear motion. Give an example of both
A force changes a bodies state of motion
Internal - aplied when skeletal muscale contract. EG. The force generated as the quadricep concentrically contracts to extend the knee.
External - Comes form outside the body. EG Friction, air resistance, weight, Gravity.
Which forces are Horizontal forces?
Weight and Reaction force
Which forces are vertical forces?
Frictional force and air resisitance
What is a net force?
This is the resultant force acting on a body when all other forces have been considered
For a High Jumper explain in terms of internal and external forces can be reparesented in a vector diagram?
In the High Jump the performer uses a large internal muscular force from the leg muscle ( quadriceps) to create a big reaction force in order to achieve as much vertical dispalcement(height) as possible. The relation ship between the amount of vertical force and horizontal force provided by the muscles will lean towards the vertical component.
