Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
32 Cards in this Set
- Front
- Back
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?
|
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?
|
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.
|