# EJSS Projectile Motion Model for Primary School

EJSS Projectile Motion Model for Primary School

 http://weelookang.blogspot.sg/2014/05/ejss-projectile-motion-model-for.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_projectile/projectile_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_projectile.zip authors: lookang author of EJS 5: Paco.

## Model

Projectile motion is a form of motion in which an object or particle (called a projectile) is thrown near the earth's surface, and it moves along a curved path under the action of gravity only. The only force of significance that acts on the object is gravity, which acts downward to cause a downward acceleration. There are no horizontal forces needed to maintain the horizontal motion – consistent with the concept of inertia.

δxδt=vx

δvyδt=ax=0

δyδt=vy

δvyδt=ay=9.81

## Energy Equations:

PotentialEnergy=mgy

where
m is the mass of the object = 1 kg,
g is the gravitational acceleration in y direction = 9.81ms2
y is the position in the upward direction

KineticEnergy=12mv2
where
m is the mass of the object = 1 kg,
v is the velocity of the object

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Labels: ejss NEWTONIAN MECHANICS