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# Section 1-3 Test

### Scence Unit 1 Chapter 1 Section 1-3 TEST

Speed Speed is the distance of an object traveled divided by the total time
Velocity Velocity is the speed of an object in a particular direction
Acceleration The rate at which velocity changes over time an object accelerates if it's speed, direction, or both change.
Motion Change in position relative to a reference point
Two factors that determine speed? Distance and time
Force A push or pull exerted on an object
Net Force The combination of all of the forces acting on an object
Friction A force that opposes motion between two surfaces that are in contact
Balance Force When the forces on an object produce a net force of 0N, the forces are balanced. No change in motion.
Unbalanced Force When the net force of an object is greater than 0N, the forces on the object is unbalanced. A change in motion.
How is friction helpful? Friction between your feet and the floor helps you walk. Rock climbers needs friction between their feet and the rock to prevent slipping.
How is friction harmful? When sliding an object more friction makes it more difficult to move. Friction in a car engine can wear out engine parts.
Ways to increase friction? Make surfaces rougher, Slide an object instead of rolling it, and increase the force pushing two surfaces together.
Ways to decrease friction? Make surfaces smoother,reduce force pushing two surfaces together, roll an object instead of sliding it, and use a lubricant (oil/grease/wax). Wax on skis makes it go faster.
What are two factors that determine the amount friction? The amount of force pushing two surfaces together, more force= more friction. The roughness of the surface, rougher surface= more friction.
To calculate a net force: When forces are in opposite directions YOU Subtract the smaller from the larger.
To calculate a net force: When forces are in the same direction YOU Add them together.
Static Friction Friction created between two surfaces that are not moving. As soon as an object starts moving, static friction is changed to Kinetic Friction.
Kinetic Friction: Rolling Friction? Rolling Friction is usually smaller than sliding friction. It's easier to pull a child in a wagon than to slide a child.
Kinetic Friction: Sliding Friction? Sliding an object usually creates more friction than rolling.
Formula for Calculating Average Speed? Average Speed= total distance over total time
To make a velocity you? Add a direction
When one speed changes it is called? Acceleration Speed up= positive acceleration Slow down= negative acceleration or deceleration or changes directions
Reference Point Non moving/moving objects. For determining motion, the surface of the earth is a common reference point.
Created by: EmilyEmily