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### 43 Cards in this Set

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 What is the name of the scientists who discovered the laws of motion? SIR ISAAC NEWTON What is necessary to change motion? (LARGE ENOUGH) FORCE If a force is not applied to an object at rest then... IT WILL STAY AT REST. If a force is not applied to a moving object then... IT WILL CONTINUE MOVING IN THE SAME DIRECTION AT THE SAME SPEED A push or a pull is a FORCE Any action that has the ability to change motion is a FORCE An English unit for force is a POUND A metric unit for force is the NEWTON Which is larger, a pound or a Newton? POUND A Newton is equal to... 1 KILOGRAM-METER PER SECOND SQUARED (kg.m/s^2) A metric unit for mass is... GRAMS The amount of matter is an object is its... MASS What property of matter resists the action of forces? MASS How does mass resist the action of forces? MAKING IT HARDER TO ACCELERATE OBJECTS A force caused by the effect of gravity on mass is WEIGHT A metric unit for weight is NEWTONS Which property will change on the Moon - mass or weight? WEIGHT (less gravity) Newton's first law of motion is INERTIA The property of an object to resist change in motion is INERTIA The amount of intertia an object has depends on the object's... MASS The Law of Inertia states that objects with greater mass are... HARDER TO CHANGE THE MOTION OF Newton's second law of motion is F = ma According to Newton's second law of motion, what causes accleration? FORCE According to Newton's second law of motion, what resists accleration? MASS According to Newton's second law, what ratio is equal to accleration? FORCE/MASS Change in speed or direction refers to ACCELERATION Is force necessary to keep an object in motion at a constant speed? NO Is force necessary to change an object's direction of motion? YES Is force necessary to slow an object down? YES Is force necessary to speed an object up? YES Is force necessary to make an object at rest move? YES The symbol for force is F The symbol for acceleration is a The symbol for mass is m The total of all forces is called the NET FORCE In a value for force, such as -60 N, the positive or negative sign indicates RELATIVE DIRECTION OF THE FORCE If forces are balanced and the net force is zero, the object is in EQUILIBRIUM If two equal forces pull in opposite directions they are called __ forces. BALANCED If a force pulling in one direction is greater than a second force pulling in another direction, the forces are called UNBALANCED What types of forces are required for an object to accelerate? UNBALANCED (or NET FORCE) If two objects have the same mass and they are pushed with the same force, their acceleration will be... THE SAME If two objects have the same mass and one is pushed with a greater force, the acceleration of that object is GREATER If one object has a greater mass than the other and both objects are pushed with the same force, the less mass will accelerate... FASTER