Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the aroma of the food to come out through the holes
To allow the heat to get into the food through the hole
To prevent the steam pressure from bursting open the pouch
To allow the microwaves to get into the food through the holes

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled
more surface area of the barrel is in contact with the road when it is pulled

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