What is a true statement about the force of static friction on a block of mass m at rest on an inclined plane that makes an angle of 30 degrees with the horizontal?
1) The force of static friction is equal to the weight of the block.
2) The force of static friction is greater than the weight of the block.
3) The force of static friction is less than the weight of the block.
4) The force of static friction is zero.