# Science 3q test

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1. What is acceleration?
The rate at which velocity changes. Acceleration happens when:

a. Speed increases (thus acceleration increases)

b. Speed decreases (called negative acceleration)

c. Direction changes ( ex. Seats on a ferris wheel are constantly accelerating because the are constantly changing direction.)
2. What is the acceleration formula for an object traveling in a strait line?
final speed - initial speed / time
3. Force definition
A push or pull. Like acceleration, force is described by it's strength and by the direction in which it acts.
4. Strength
Strength is measured in newtons (N)
5. Direction (of force)
Represented by an arrow pointing in the direction of the force. The longer the arrow, the greater the force.
6. Combined (or net) forces
All the forces acting on an object
7. Balanced forces (definition)
Equal forces acting on one object in opposite directions. Balanced forces do not change the object's motion.
8. Unbalanced Forces
When they act on an object they result in a net force and cause a change in the object's motion.
9. Friction (definition)
A force that resists motion. Produced by surfaces or materials rubbing together.
10. Static friction
acts on objects that are not moving
11. sliding friction
happens when two solid surfaces slide over eachother
12. Rolling Friction
Happens when an object rolls across a surface.
13. Fluid friction
Happens when a solid object moves through a fluid
14. Gravity (definition)
A force that pulls objects toward each other. It depends on mass and distance. The greater the distance, the weaker the force. The greater the mass, the greater the force. Weight changes based on the gravitational force of the planet. Mass does not.

### Card Set Information

 Author: Anonymous ID: 76406 Filename: Science 3q test Updated: 2011-03-31 11:12:36 Tags: science Folders: Description: These are the study cards for the third quarter science test. Show Answers:

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