#### Transcript 3rd quarter study guide

rd 3 quarter study guide Acceleration. a. The rate at which velocity changes is called b. Distance traveled in a unit of time c. Traveling from point A to point B To determine the acceleration rate of an object, you must calculate the change in ________ during each unit of time a. b. c. d. speed. velocity. motion. deceleration. Law of Interia a.Newton’s third law b.Newton’s first Law c.Newton’s second law The amount of matter in an object is called its a. b. c. d. inertia. mass. force. balance. Air resistance is a type of a. b. c. d. motion. acceleration. velocity. friction. Which of the following is an example of decreasing friction intentionally? a. waxing skis b. throwing salt on an icy driveway Acceleration is a. Changing direction only b. Changing direction or speed c. Changing time A bus that travels 250 kilometers in 5 hours is traveling at what average speed? a. b. c. d. 50 km/h 100 km/h 2 km/h 25 km/h Write next to each if rolling, fluid, or sliding friction a. b. c. d. your sneakers on a basketball court tires to a skate board a grease on a door hinge two hands rubbing together Write next to each if rolling, fluid, or sliding friction a. your sneakers on a basketball court Sliding b. tires to a skate board Rolling c. a grease on a door hinge Fluid d. two hands rubbing together Sliding ______ equals mass times acceleration a. b. c. d. speed. motion. force. inertia. The balloon rocket lab we preformed in class can be explained by a. b. c. d. Newton’s first law. Newton’s second law. Newton’s third law. the law of conservation of momentum. Force is a . a. inertia. b. acceleration. c. Push or pull The force of gravity on a person or object at the surface of a planet is known as a. b. c. d. mass. inertia. air resistance. weight. When a person jumps off the diving board the only force acting on them is: a. b. c. d. stationary. decelerating. in free fall. a projectile. The law of universal gravitation states a. all objects attract each other. b. all objects repel each other. c. all objects combine to provide a balanced force. d. all objects create friction. The greater the mass of an object, a. the easier the object starts moving. b. the greater its inertia. c. the more balanced it is. d. the more space it takes up. Velocity a. You know acceleration of the object. b. You know distance the object has traveled. c. You know both the speed and direction of an object’s motion. According to Newton’s third law of motion, when a ball bounces and exerts force on a floor, the floor a. b. c. d. creates a friction with the ball. bounces higher. exerts an equal force back on the ball. moves at a constant speed. What happens when two forces act in the opposite direction? a. They work against each other. b. The stronger one prevails. c. They add together. d. Their sum divided by two is the total force. Friction a. The force that one surface exerts on another when the two rub against each other b. Change in velocity over time d. Amount of force put on an area An example of deceleration? a. a bird taking off for flight b. a baseball released by a pitcher c. a bike approaching a stop sign d. an airplane following a straight flight path When an object’s distance from another object is changing a. b. c. d. it it it it is in motion. is speeding. has a high velocity. is accelerating. Momentum a. Distance÷Time b. Mass X velocity c. Mass X acceleration Speed equals a. Distance÷Time b. Mass X velocity c. Mass X acceleration According to the law of conservation of momentum a. velocity increase. b. velocity decreases. c. momentum is not lost. A place or object used for comparison to determine if something is in motion is called a. b. c. d. a constant. a reference point. a position. velocity. The momentum of an object is in the same direction as its a. b. c. d. force. acceleration. velocity. inertia. The force that pulls falling objects toward Earth is called a. b. c. d. freefall. gravity. acceleration. air resistance.