Forces and Motion…. Everyday pushes and pulls (that we never think about). Everyday Forces. Which two forces have we studied this year?. Gravity: the pull between all objects (the greater the mass, the harder the pull!!!). Discovered by Sir Isaac Newton when an apple fell upon his head….
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Everyday pushes and pulls
(that we never think about)
Which two forces have we studied this year?
The rough surface of the mountain causes friction and gives us a grip on the side of the mountain when we rock climb.
Friction keeps us from sliding off the skateboard.
The tread on our shoes causes friction, and keeps us from ending up like this guy on icy roads.
When forces are balanced, no change in motion occurs.
When forces are unbalanced, a change in motion occurs.
I need to know an object’s starting position to be able to tell it has moved over a distance!
Time = 1 hour
Distance = 55 miles
Formula: Distance/Time = Speed
Ex: 55 miles/1 hour = 55 miles per hour
Leroy is the fastest. He completed the race in 3 hours.
What is the difference between speed and velocity?
Speed is just distance/time. Velocity includes direction as well.
When an object’s motion changes by slowing down, we call this deceleration.
How can a car be accelerating if its speed is a constant 65 km/h?
If it is changing directions it is accelerating
The faster an object is moving, the more momentum it has.
Ex: It’s harder to stop a car going 50 miles an hour than a car going 10 miles an hour.
The more mass an object has, the more momentum it has.
Ex: It’s harder to stop a 200 lb. linebacker than a 100 lb. ballerina