No, a ball retriever does not count as a club in your bag.
the mass of the ball and club and the velocity of the club
The face of the club.
It is a device used to hit a golf ball in the game of golf or it is a member club in the grounds of which golf is played.
you hit it with a golf club on the ground or on a peg
A golf club
You use a club.
Golf! In golf, you use the tee, to set your ball on it, then you hit the ball with your selected club.
The problem with a golf ball is that you have to hit it with a golf club, one of the major drawbacks is that it occassionally doesn't go where you want it to.
The club may strike the ball in such a way as to induce it to spin. This affects the aerodynamics of the ball, and can cause its path to curve.
mass of the club
Its momentum is due to the amount of energy transfered from club to ball. There are a few factors in this transfer, the speed of the club head, the compression of the club face and most importantly the compression of the golf ball.