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Transcript
What is Newton’s 1st Law of motion? What equation is related to Newton’s 2nd law of motion? Calculate the net force acting on the box Calculate the force on a 25 kg rock moving with an acceleration equal to 18.2 m/s2. Calculate the acceleration of a 50 kg rock with a 100 N force acting on it. Why is your weight less on the Moon than on Earth, but your mass is the same? Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s2. A 10-kg wagon has a speed of 25 m/s. What is its momentum? Sally sits on a rock. Her weight is an action force. Describe the reaction force. Masses Racquetball = 20 grams Tennis Ball = 57 grams Baseball = 145 grams Softball = 178 grams Velocity = distance (centimeters) divided by time (seconds) Momentum = mass x velocity According to Newton's second law of motion, a larger force acting on an object causes a greater ________ of the object. A 3,000-N force acts on a 200-kg object. The acceleration of the object is ____. Two objects that have the same mass are dropped from a tall building. One object is larger and flatter than the other. Explain why the larger, flatter object hits the ground last. True or False Momentum is a property of an object and can be transferred from that object to another object. If gravity did NOT affect the path of a horizontally thrown ball, the ball would ____. a. go straight up b. travel horizontally c. fall straight down d. follow a curved path Bell Ringer: Calculate the force on an object that has a mass of 20 kg and an acceleration of 15 m/s2. The statement "to every action there is an equal and opposite reaction" is ____. Bell Ringer: A ball is attached to a string and swung. If the string breaks at Point A, in which direction will the ball be traveling an instant later?