5 forces acting on a performer during linear motion
Gravity
Frictional force
Air resistance
Internal muscular force
Weight
describe the force of gravity/ weight
a downwards acting force. weight is gravitational force that earth exerts on the body
describe frictional force
the force that resists motion when the surface of one object comes into contact with the surface of another
describe air resistance
a force which opposes the motion of a body moving through air
describe internal muscular force
force applied by contraction of muscles in body
Define weight
the gravitational force that earth exerts on the body
define velocity
the rate of change of displacement
define displacement
the shortest route between starting and finishing point
define acceleration
the rate of change of velocity
define momentum
the quantity of motion of a body
equation for weight
mass x acceleration due to gravity
equation for velocity
displacement/ time
equation for displacement
measuring straight line between two points
equation for acceleration
(final velocity- initial velocity)/time taken
equation for momentum
mass x velocity
units of weight
N (newtons)
units for velocity
m/s
units for displacement
m (meters)
units for acceleration
m/s2
units for momentum
Kg m/s
5 vector measures
weight, velocity, displacement, acceleration, momentum
3 scalar quantities
mass, speed, distance
define speed
distance covered by a moving object in a unit time taken
define distance
length of space between two points