sled,slow,slide,steep.
One would need materials like wood or aluminum to mold into the shape of a sled. Also something on the bottom of the sled that will slide across the snow and not create friction to slow it down.
worn belt or your clutches need to be rebuilt
friction
Your Ford Explorer could be backfiring because of bad gas. You may want to have it looked at by a local professional.
well i would say a wrenchThe correct answer is of course a .......wrench
Adding sandpaper to the bottom of a sled to slow it down is an example of intentionally increasing friction.
If it is backfiring only when you kill the engine, allow the engine to idle a few minutes before you kill it. If it is backfiring while in use, check the intake gasket and bolts for wear or looseness.
a sled
They tend to live in there sled packs that they pull the sled in
To prevent backfiring make sure the belt is tight and in good working order. Also clean the air filters regularly.
If it is backfiring the timing is set incorrectly or the spark plug wires are not connected in the correct order.