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# Chapt 1 and 2 Motion

### Assessment Review

QuestionAnswer
What determines how difficult it is to stop an object? momentum
The rate of change in velocity is called acceleration
What is used for a comparison when motion is described? Frame of Reference
The rate at which an object moves is its speed
Change in position in a certain amount of time is motion
Speed in a given direction is velocity
A negative acceleration is called deceleration
The velocity of an object changes if speed or direction changes
When deceleration occurs, velocity decreases
An example of constantly changing velocity is circular motion
Even when slowly moving a train cannot stop suddenly because of its large momentum
Speed that does not change is called constant speed
The Law of Conservation of Momentum states that momentum cannot be lost or gained
A distance-time graph for acceleration is always a curved line
When an object slows, it's velocity, speed, and momentum change
Force is necessary to stop, start, or change the direction of an object
When forces are balanced, the motion of the object does not change
What can be used to reduce friction? oil, wheels, ball bearings
Example of fluid friction? oil
Friction produced by wheels or ball bearings is called rolling friction
What friction has the highest resistance? sliding
An object at rest will remain at rest is explained in Newton’s First Law
Newton’s Second Law of Motion relates to force, mass, and acceleration
Kg x m/s/s = force
When working with force, weight is measured in Newtons
Newton’s Third Law of Motion describes for every action there is an equal but opposite reaction
Forces act in pairs falls under Newton’s Third Law
What is the value of gravitational acceleration? 9.8 m/s/s
As an object increases speed, the air resistance increases
Created by: huizenga

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