Today i went to my grandma's house for dinner and tossed a tennis ball around with my cousin Caiden. When he threw me the ball i saw that it was spinning and realized that it has rotational motion. Rotational motion means that the axis is within the object. There is a distinct difference between rotational and circular motions. Rotational motion is like spinning around in place, and circular motion is like walking around a track. Rotational motion has torque. Torque is defined as a force that causes or opposes rotation. The equation for torque is τ = rF when the force is perpendicular to the lever arm. The lever arm is the distance between the force and the hinge/axis. τ is torque, r is the lever arm distance and F is the force. With the tennis ball, the lever arm distance is the radius of the ball, the axis is the the center of the ball, and the force is Caiden's fingers when he tosses the ball in the air.