prallen
to rebound
To hit a surface or obstacle with force and bounce back or glance off it.
Der Ball prallte von der Wand ab und rollte ins Aus.
The ball rebounded off the wall and rolled out of bounds.

to rebound / bulge
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to rebound
To hit a surface or obstacle with force and bounce back or glance off it.
Der Ball prallte von der Wand ab und rollte ins Aus.
The ball rebounded off the wall and rolled out of bounds.

The subject of the sentence reveals the meaning: a moving object (ball, car) rebounds or crashes into something. A container (bag, suitcase) is 'prall gefüllt' (filled to bursting). The sun beats down on a surface.
Das Auto prallte gegen einen Baum.
The car crashed into a tree.
In this meaning, 'prallen' (to rebound / crash) is often used with prepositions that indicate a direction or point of contact. 'gegen' (against) or 'auf' (onto) with the accusative are typical.
Die Wellen prallten mit voller Wucht gegen die Klippen.
The waves crashed against the cliffs with full force.
In this meaning, the participle form 'prall' is often used like an adjective, frequently in the fixed phrase 'prall gefüllt sein' (to be filled to bursting).
Die Äste des Apfelbaums waren prall mit Früchten.
The branches of the apple tree were heavy with fruit.
When talking about intense sunshine, the subject is almost always 'die Sonne' (the sun). This use is often figurative and describes great heat.
Wir suchten Schatten, weil die Sonne so stark auf die Terrasse prallte.
We looked for shade because the sun was beating down so strongly on the terrace.
to shine / seem
'scheinen' and 'prallen' can both describe sunlight falling on something. 'scheinen' is the normal word for light: the sun, a lamp, or the moon can shine. In this context, 'prallen' is used almost only with the sun and means that it shines very strongly, hotly, and directly onto a surface. The words can be confused because both occur with the sun. Remember: 'scheinen' is general, while 'prallen' sounds strong and often unpleasantly hot.

Mittags prallt die Sonne auf den Balkon, deshalb bleibt die Tür zu.
At midday, the sun beats down on the balcony, so the door stays closed.
Am Morgen scheint die Sonne durch das Küchenfenster.
In the morning, the sun shines through the kitchen window.