Newton's first law of motion states that an object will maintain its current state of motion unless acted on by an unbalanced net force.
Which of the following statements is not a proper application of this law to an object's motion?
Dave cannot throw a bowling ball as high in the air as a golf ball.
When Alex slams on the brakes in his car, his body flies forward until stopped by the seatbelt.
The air hockey puck struck by Brian moves in a straight line until it hits a wall.
A rock remains motionless on the ground until Jacob kicks it.
