When you hit a baseball with a bat, the force of the bat on the ball only lasts for a moment. What would happen to the motion of the ball if the bat were to apply a constant force to the ball the entire time the ball is moving? It would continually positively accelerate. (remember the carts and rulers outside? Forces cause accelerations.) Why is it beneficial to run with a ball prior to throwing it in order to increase its range? The velocity of the runner will be combined with the velocity of the ball, and it will go faster. As the result of a serve, a tennis ball (mb=58 g) accelerates at 430 m/s2 for the very brief time it is in contact with the racket. How much force was required to cause this acceleration? M=58 g F=ma F=58 (430) a=430 m/s2 F=24,940 N F=? What affects momentum? How much momentum does a 68 kg person running at 5 m/s have? Mass and velocity. P=MV P=68 kg (5 m/s) P=340 kgm/s What is Newton's first law of motion? Objects in motion stay in motion, and objects at rest stay at rest unless acted on by an unbalanced force. Explain why people who get rear get whip lash using Newton's first law. The people in the car are at rest. When they get hit, their car suddenly accelerates forward. If their headrest isn’t adjusted properly, the seat will push the torso forward and the head will be left behind (at rest), causing whip lash. What is Newton's second law?
When you hit a baseball with a bat, the force of the bat on the ball only lasts for a moment. What would happen to the motion of the ball if the bat were to apply a constant force to the ball the entire time the ball is moving? It would continually positively accelerate. (remember the carts and rulers outside? Forces cause accelerations.) Why is it beneficial to run with a ball prior to throwing it in order to increase its range? The velocity of the runner will be combined with the velocity of the ball, and it will go faster. As the result of a serve, a tennis ball (mb=58 g) accelerates at 430 m/s2 for the very brief time it is in contact with the racket. How much force was required to cause this acceleration? M=58 g F=ma F=58 (430) a=430 m/s2 F=24,940 N F=? What affects momentum? How much momentum does a 68 kg person running at 5 m/s have? Mass and velocity. P=MV P=68 kg (5 m/s) P=340 kgm/s What is Newton's first law of motion? Objects in motion stay in motion, and objects at rest stay at rest unless acted on by an unbalanced force. Explain why people who get rear get whip lash using Newton's first law. The people in the car are at rest. When they get hit, their car suddenly accelerates forward. If their headrest isn’t adjusted properly, the seat will push the torso forward and the head will be left behind (at rest), causing whip lash. What is Newton's second law?
quarter_4_final_study_guide_physics_answers_2013.docx