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### 45 Cards in this Set

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 What is a force? A push or pull When describing a force, what are three things that I must give? an amount, a unit, and a direction What units do I use for force? Newtons What are some examples of different types of forces? gravity; momentum What is meant by the term "net force"? Overall force acting on an object What does it mean to say that the net forces on an object are balanced? equal weight on each side What does it mean to say that the net forces on an object are unbalanced? unequal weight on each side Calculate net force on blocks as pictured on study guide. See study guide What is inertia? a property of matter by which it remains at rest or in uniform motion in the same place unless touched by an outside force What determines the amount of inertia of an object? gravity What is Newton's First Law of Motion? An object will remain at rest until an outside force acts upon it. What is the mathematical equation for force? f = m x a What factors affect the strength of gravitational attraction? mass and friction Why do astronauts float in space? Why do planets orbit the sun? because the pull of the earth is faint on the moon. Also because the sun has a gravitational pull on the planets. What is the difference between mass and weight? mass: how much matter is in an object weight: how strong the gravitational pull pulls the object What will the mass of an 85 kg astronaut be on the moon? not answered in study guide What units do I use for mass? For weight? for mass: grams for weight: Newtons What is the forumula used to calculate weight? W = m x g What is the acceleration due to gravity on Earth? terminal velocity What is air resistance? resistance of an object to gravity while falling What two factors affect the amount of air resistance on an object? velocity cross-sectional area How do I calculate air resistance (think about the parachute lab)? velocity and speed act in opposite direction of an object's motion What is meant by the term "terminal velocity"? final speed Why does an ojbect reach terminal velocity? because the object has to stop someplace How do parachutes work? they use air resistance and take up as much space as possible while having a small weight What is friction? a foce that opposes motion between two touching surfaces What are the three types of friction? sliding rolling fluid What does the coefficient of friction tell us? not answered in study guide What is Newton's Third Law of Motion? for every action there is an equal and opposite reaction Does the Third Law mean that all forces are balanced? Why or why not? yes, because there is an opposite reaction for every action How do rockets work? they use newton's third law: the hot gas is the action, causint it to shoot forward, which is the reaction What is momentum? when an ojbect picks up speed How do we calculate momentum? p = m x v What units do we use for momentum? m/s What does the Law of Conservation of Momentum state? nothing changes unles there is an outside force What does Newton's Law of Universal Gravitation state? most objects in th euniverse are too small to have a gravitational pull Make sure you know how to calculate all problems in study guide (items 39-47) See study guide What is formula for Speed/Velocity? s = v = d / t d = s x t t = d / s What is formula for acceleration? a = (vf - vi) / t t = (vf - vi ) / a vf = (a x t) + vi What is formula for force? F = m x a a = F / m m = F / a What is formula for momentum? p = m x v v = p / m m = p / v What is formula for weight? W = m x g g = W / m m = W / g g = 9.8 m/s squared on Earth What is gravity on Earth? 9.8 m/s squared what is the weight of a 5 gram pencil on earth? 5 grams What is Newton's Second Law of Motion? The acceleration of an object is related to the net force acting on it and the mass of the object