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