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32 Cards in this Set
- Front
- Back
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When does motion occur?
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When an object changes position
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What do you need to know if motion has taken place?
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A reference point
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What is relative motion?
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When you're not moving relative to your desk , but you are moving relative to other planets.
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What is distance?
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How far an object moves.
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What is displacement?
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The distance and direction of an objects change in position from the starting point.
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What is speed?
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The distance an object travels per unit of time.
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What is the difference between distance and displacement?
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Distance is how far an object has moved. Displacement is how far an object has moved and what direction it has moved from a starting point.
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What is rate?
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Any change over time
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How do you calculate speed?
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Distance
Speed = __________ Time |
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What is average speed?
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Total distance traveled divided by the total time traveled.
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What is instantaneous speed?
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Speed at a given point in time.
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If an object is moving at a constant speed, does the instantaneous speed change?
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NO
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What is an exmple of instantaneous speed?
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Speed shown on a speedometer
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What does a distance time graph show?
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The motion of an object over a period of time.
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On a distance time graph what does the slope of the line representing the objects motion represent?
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The speed. The faster the speed the greater the slope.
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On a distance-time graph where can you find the velocity?
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The slope
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What is velocity?
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the speed of an object and the direction of its motion.
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What's the difference between speed and velocity?
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Speed describes only how fast something is going. Velocity describes how fast and the direction of its motion.
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What is acceleration?
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The rate of change of velocity
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When does acceleration take place?
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When an object changes its speed, its direction, or both.
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What is positive acceleration?
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1) When the speed increases
2) When the acceleration is in the same direction as the velocity |
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What is negative acceleration?
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1) When the speed slows down.
2) When the acceleration is in the opposite direction of the velocity. |
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What is the formula for Acceleration?
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change in velocity
Acceleration =__________________ time |
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What is force?
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A push or pull that one body exerts on another
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What is net force?
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The combined forces when two or more forces act on an object at the same time.
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What is balanced forces?
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Forces on an object that are equal in size and opposite in direction.
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What is inertia?
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The tendency of an object to resist any chang in motion.
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What is the inertia of an object related to?
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Its mass . the greater the mass the greater the inertia.
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What are Newton's laws of motion?
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rules that dscribe the effects of forces on the motion of objects.
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What is Newton's first law of motion?
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An object at rest stays at rest unless acted upon by a net force.
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What is another name for Newton's first law of motion?
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Law of Inertia
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What is an unbalanced force?
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Forces resulting in a net force that changes the motion of a body.
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