The bullet will strike below the mark.
Why will the bullet strike below the mark?
Because the force of gravity draws it towards the earth, while it is going from the gun to the mark.
When a ball attached to a string is whirled around, as in [Fig. 38], what is the tendency of the ball?
The tendency of the ball is to fly off in a straight line.
Fig. 38.
What is the force tending to make the ball fly off called?
It is called centrifugal force.
What keeps the ball from flying off?