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23 Cards in this Set
- Front
- Back
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What is a force?
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The push or pull of one object on another.
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When describing a force, what are three things that I must give?
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An amount, a unit, and a direction.
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What units do I use for force?
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Newtons (N)
1 N = 1 kg m/s squared |
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What are some examples of different types of forces?
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- Frictional force (how strong friction is)
- Gravitational force (weight) - Torque (perpendicular force) |
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What is meant by the term "net force"?
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The forces acting on an object.
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What does it mean to say that the net forces on an object are "balanced"?
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Balanced forces keep an object in motion or at rest.
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What does it mean to say that the net forces on an object are "unbalanced"?
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An unbalanced force makes a moving object stop or an at rest object move.
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What is Newton's First Law of Motion?
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An object in motion will stay in motion and an object at rest will stay at rest unless an unbalanced force is acted upon it.
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What is inertia?
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The tendency of objects to resist any change in motion.
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What determines the amount of inertia of an object?
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The amount of inertia of an object is directly related to its mass (the more massive an object is, the more inertia it has).
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How many laws of motion is Newton responsible for?
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Three
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What else is Newton's first law of motion called?
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The law of inertia.
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What is inertia?
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The tendency of objects to resist any change in motion.
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The amount of inertia that an object has is directly related to its ______.
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Mass
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Force is a vector or scalar quantity?
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Vector -- which means you need an amount, a unit, and a direction to calculate force.
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What unit is used to calculate mass?
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kilograms (kg)
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What is frictional force?
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How strong friction is.
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What is gravitational force?
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weight
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What is torque?
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perpendicular force
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Force is either __________ or __________.
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balanced or unbalanced
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According to Newton, what do objects want to do?
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Maintain their motion; stationary objects will continue to not move and objects in motion will keep their same velocity until acted upon by a net force.
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Which has more inertia, a walking elephant or an eighth grader flying down Broad Street on a bike?
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The elephant has more inertia because it has more mass. The velocity of an object does not affect its inertia.
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What is the unit for force and where does it come from?
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The unit is the Newton (N) and it is made up of kilograms times meters per second squared.
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