Dynamics Exam Extra Credit Name:____________________ Class:__________ 1. Define each of the following terms, and give units where appropriate: Mass Inertia Net force Weight equilibrium 2. A young girl slides down a rope. As she slides faster and faster, she tightens her grip, increasing the force exerted on her by the rope. What happens when this force is equal in magnitude to her weight? Explain. Felicia, the ballet dancer, has a mass of 45.0 kg. a) What is Felicia’s weight on b) What is Felicia’s mass on 3. Jupiter, where the acceleration due to gravity is 25.0 m/s2? c) What is Felicia’s weight on Jupiter? 4. Suppose you jump from the cliffs of Acapulco and perform a perfect swan dive. As you fall you exert an upward force on the earth equal in magnitude to the downward force the earth exerts on you. Why, then, does it seem that you are the one doing all the accelerating? 5. An object falling through the sky at a constant speed of 15 m/s experiences two forces: gravity and air resistance. Which force is greater? How do you know? 6. A 30.0-g arrow is shot by William Tell through an 8.00-cm-thick apple sitting on top of his son’s head. If the arrow enters the apple at 30.0 m/s and emerges at 25.0 m/s in the same direction, with what force has the apple resisted the arrow? 7. The following forces act on an 10kg object: 10 N north, 50 N south, and 40 N west. a) Draw a free-body diagram. b) Determine the net force. C) Determine the acceleration of the object.
Dynamics Exam Extra Credit Name:____________________ Class:__________ 1. Define each of the following terms, and give units where appropriate: Mass Inertia Net force Weight equilibrium 2. A young girl slides down a rope. As she slides faster and faster, she tightens her grip, increasing the force exerted on her by the rope. What happens when this force is equal in magnitude to her weight? Explain. 3. Felicia, the ballet dancer, has a mass of 45.0 kg. a) What is Felicia’s weight on b) What is Felicia’s mass on Jupiter, where the acceleration due to gravity is 25.0 m/s2? c) What is Felicia’s weight on Jupiter? 4. Suppose you jump from the cliffs of Acapulco and perform a perfect swan dive. As you fall you exert an upward force on the earth equal in magnitude to the downward force the earth exerts on you. Why, then, does it seem that you are the one doing all the accelerating? 5. An object falling through the sky at a constant speed of 15 m/s experiences two forces: gravity and air resistance. Which force is greater? How do you know? 6. A 30.0-g arrow is shot by William Tell through an 8.00-cm-thick apple sitting on top of his son’s head. If the arrow enters the apple at 30.0 m/s and emerges at 25.0 m/s in the same direction, with what force has the apple resisted the arrow? 7. The following forces act on an 10kg object: 10 N north, 50 N south, and 40 N west. a) Draw a free-body diagram. b) Determine the net force. C) Determine the acceleration of the object.