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### 55 Cards in this Set

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 What happens when two forces act in the same direction? Add together The tendency for an object to resist a change in its motion is known as this. Inertia The greater the __________ of an object, the greater its inertia. Mass The force of gravity on a person or object on the surface of a planet is called this. Weight What should you do to increase acceleration? Decrease mass, Increase mass, or both Decrease mass The force that one surface exerts on another when the two rub against each other is called this. Friction When the only force acting on a falling object is gravity, the object is said to be this. In free fall Air resistance is a type of ________. Friction Product of an object's mass and velocity is called it this. Momentum The momentum of an object is is in the same direction as its this. Velocity To increase momentum you should: Increase mass Increase velocity Increase mass and velocity Increase acceleration Increase mass and velocity The force that pulls falling objects toward Earth is called ____________. Gravity The SI unit for force. Newton A unit of pressure is called this. Pascal Air pressure decreases as elevation ______________. increases Pascal's principle deals with this type of substance. Fluids True or False Buoyant force acts in a downward direction. False Amount of matter in an object is called this. Mass True or False According to Newton's third law of motion, when a hammer strikes a nail and exerts a force, the nail disappears into the wood. False True or False Balanced forces on an object always change the object's motion. False True or False Air pressure exerted equally on an object from different directions is balanced pressure. True Water pressure increases as depth ______________. increases True or False If an object floats, the volume of displaced water is equal to the volume of the entire object. False, only submerged portion This rule states that the buoyant force on an object is equal to the weight of the fluid displaced by the object. Archimedes' Principle When water fills a submarine's flotation tanks, the overall density of the submarine _________. Increases True or False A ship stays afloat as long as the buoyant force is less than the ship's weight. False Mass per unit volume of a substance is its _____________. Density An object that is more dense than the fluid in which it is immersed will do this. Sink A material that can easily flow is called this. Fluid When an object's distance from another object is changing, it is in ______________. Motion Speed equals distance divided by ____________. Time When you know both the speed and direction of an object's motion, you know this about the object. Its velocity If one of Earth's plates moves 5 cm every year, how far will it move in 500 years? 25 meters The rate at which velocity changes is called this. Acceleration To determine the acceleration rate of an object, you must calculate the change in speed during each unit of ____________. Time True or False Average speed is the total distance traveled multiplied by the total time False, Divided A place or object used for comparison to determine if an object is in motion is called this. A reference point On a graph showing distance versus time, a horizontal line represents an object that is: moving at a constant speed or not moving at all Not moving If you know the distance an object has traveled in a certain amount of time, you can determine this. Speed of object Changing direction is an example of a kind of _______________. Acceleration If Jared travels 30 km in two hours, his average speed is this. 15 km/h If you know a car traveled 200 km in 2 hours, you can find its: Velocity Acceleration Average Speed Average speed In an acceleration graph showing speed versus time, a straight line shows the acceleration is: Constant Decreasing Increasing Constant The overall force on an object after all the forces are added together is called this. Net force A person traveling in a car that stops suddenly keeps moving forward due to this. Inertia This acts in a direction opposite to an object's direction of motion. Fricton The pressure resulting from a force of 50 N exerted over an area of 5 meters squared is ___________. 10 Pascals This force acts in the direction opposite the force of gravity Buoyant A penny sinks in water because the penny is more _________ than the water. dense When riding a bike past a building, you are not moving relative to this. Bike The statement that the motion of a storm is 10 km/day in an easterly direction is a description describing the storm's this. Velocity Acceleration is the rate of change in ____________. speed This occurs when an object slows down. Deceleration If a train traveling at 30 m/s brakes to a stop in 1 minute, its acceleration is _____________. 0.5 m/s/s Unscramble the term teeeandoiclr Deceleration