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# Introduction to 4th grade force unit

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## Shannon Hatton

on 23 October 2012

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#### Transcript of Introduction to 4th grade force unit

Force The Way Things Move How long it takes something to move over a period of time Speed A change in distance over time Speed You need to know how far something moved,and how long it took it to do so. If my car moves 52 miles per hour or 52 mph what does that mean? How to find speed First find the distance traveled Then how long it took to get that far Then divide the distance by the time In one hour you ride your bike
7.5 miles. What is your speed? This is not only have fast something moves but its direction Velocity So it is speed + direction For vacation I am going on a cruise, to South America.
The boat travels at 75 mph.
What is the boats velocity? 75 mph south A girl runs 50 meters north. Then she runs 50 meters west. Her speed does not change. Does her velocity change? Critical Thinking Pendulum Describe it's movement in terms of velocity and speed Force Acceleration Newton's Laws The law of Inertia First Law the tendency of an object in motion to stay in motion and an object at rest to stay at rest. In other words: Things will not move unless a force moves them. They also do not stop moving until some force stops them. Based on this Law what do we know about this ball? The other two laws Second Law Third Law The heavier something is the more force you'll need to move it For every action there is an equal but opposite reaction If you punched a wall what would happen? A force that works against motion. Friction The force that makes moving things stop.
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