Physics 9/30
Presentation
•
Physics
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9th - 12th Grade
•
Easy
Standards-aligned
Bryan Hood
Used 6+ times
FREE Resource
11 Slides • 3 Questions
1
Physics 9/30
Acceleration and Forces
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Open Ended
Chop Wood, Carry Water
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How can you exert a constant unbalanced force?
Spring Scale
Low-resistance Cart
Pull the spring scale and cart with a constant Force reading on the spring scale.
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What are the results?
If you perform this investigation and measure the cart's velocity for a period of time, you could construct a graph
What if we repeat with a larger constant force?
What if we repeat with an even larger constant force
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Fill in the Blanks
Type answer...
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What does the data show us?
If we calculate the slope of each line and plot the results for each force to make an acceleration-force graph we will see that acceleration and force have a linear relationship.
Because it is linear, we can apply the equation for a straight line:
y=kx + b
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y=kx + b
The y intercept is 0 so we can simplify the equation to y=kx
y is acceleration
x is force
Therefore acceleraction equals the slope of the line times the applied net force.
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What is the physical meaning of the slope of the acceleration-force graph?
To see change the object. What would happen if we added a second cart on top of the first, and then a third? The spring scale would be pulling two carts and then three. Let's look at this graph.
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Mass
The same force is applied in each case, with 2 carts the acceleration is 1/2 the acceleration of 1 cart. With 3 carts the acceleration is 1/3 of 1 cart. As the number of carts increases, the acceleration decreases. In other words, a greater force is needed to produce the same acceleration.
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A new equation
All of this leads us to a the equation a=Fnet/m
Recall that forces are measured in units called Newtons. Because Fnet=ma, a Newton has the units of mass times the units of acceleration. So one Newton is equal to on kg.m/s2.
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Open Ended
Exit Ticket - What is the net force on an object that has an acceleration of 0 m/s2?
Physics 9/30
Acceleration and Forces
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