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21 Cards in this Set
- Front
- Back
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What is a "force"?
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A push or a pull on an object. Forces have size and direction
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What is the SI unit for force?
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Newton (N)
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What do we mean by the term "net force"?
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Force that results from combining all the forces acting on an object.
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How do you find the net force if the forces are going in the same direction?
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Add them
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How do you find the net force if the forces are going in opposite directions?
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Subtract them
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What are "balanced forces"?
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Occurs when the net force on an object is zero. The object does not move in any direction, because all of the forces are balanced.
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What are "unbalanced forces"?
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Occurs when the net force on an object is NOT zero. The object moves because one or more of the forces are greater than the others.
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T/F: Unbalanced forces produce motion.
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True
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Name 5 relative directional terms
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to the right, forward, backward, to the left, upward, downward
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What is weight?
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the measure of how much gravity is pulling an object
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What is gravity?
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a force of attraction between two objects that is there just because there is matter there.
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What is friction?
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a force that opposes motion between two surfaces that are touching
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Name 4 types of friction
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Sliding, rolling, fluid, static
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Name 3 ways to reduce friction
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-Using Lubricant
-Making the surface smoother -Use wheels |
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Name 2 ways to increase friction
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-Switch from rolling to sliding
-Make the surface rough |
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What is motion?
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When an object changes its position over time
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Speed=
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Distance/Time
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Distance=
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Speed X Time
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Time=
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Distance/Speed
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What is "velocity"?
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The speed of an object in a particular direction
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What is acceleration?
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a change in velocity-either speed or direction,or both
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