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### 23 Cards in this Set

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 What is Newton's first law of motion? An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. What is an unbalanced force? A force that changes the state of motion of an object If an unbalanced force is applied to a non-moving tennis ball, what happens? The tennis ball will move in the direction according to the area affected by the unbalanced force. Scenario A: "Have you ever observed the behavior of coffee in a coffee cup filled to the rim while starting a car from rest or while bringing a car to rest from a state of motion? Coffee 'keeps on doing what it is doing.'" Is this an example of an everyday situation applying to Newton's 1st law? Why? Yes because the unbalanced force (the car starting) causes the car to move, therefore causing the coffee inside the cup to move. How is Newton's first law applied when Jimmy rides a skateboard? The skateboard is the object in a state of motion (being still). When Jimmy pushes off the ground, the act of pushing off acts as the unbalanced force which changes the state of motion of the object. This causes the skateboard to move either forwards or backwards. How can he use this knowledge to ride his skateboard more safely? He can be prepared since he knows small bumps and cracks can act as unbalanced forces and change the direction of his skateboard. This can lead to more safety precautions gear like helmets, elbow guards, and knee guards. What is inertia? Inertia is the tendency for objects to resist changes in a state of motion. Why is Newton's first law also called inertia? Newton’s first law of motion of also commonly known as the law of inertia because in order for the object to change the state of motion, inertia is involved How is mass related to inertia? Mass is related to inertia because the tendency of an object to hold back from modifications in the states of motion has a lot to do with the amount of mass. The more mass the object has more resistant to changes of the states of motion. What is Newton's second law of motion? The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. What is acceleration? Acceleration is the change of velocity in a moving thing. What is speed? The pace (how fast or how slow) an object is going What is velocity? Velocity can tell you both the speed and the direction How are velocity and speed different? Speed only tells you how fast the object is going but velocity tells you both the speed and direction of the object (velocity is a vector). What is a vector? Something having direction as well as magnitude, especially as determining the position of one point in space relative to another. How can arrows (vector arrows) be used to represent velocity? Long arrows represent the speed and the direction of the arrow represents the direction. What is momentum? Momentum= Mass x VelocityIt is the property of a moving object that makes it harder to stop. What is mass? the quantity of matter in a body regardless of its volume or of any forces acting on it. What is the scientific unit for momentum? kg * m/s If a skateboarder's mass is 60 kg and his velocity is 1.5m/s, what is his momentum? Momentum= Mass x VelocityMomentum = 1.5 x 60Momentum= 9090kg*m/s What is Newton's third law of motion? For every action, there is an opposite reaction. What is Newton's cradle? A device that demonstrates conservation of momentum and energy via a series of swinging spheres. What is an example of Newton's third law? Why? If Roland and Andrew are on roller skates, and they push off forwards to each other, they will go backwards. This is because the action (them pushing off each other) created a reaction (going backwards).