What kind of acceleration is being demonstrated speeding up or slowing down? Is the acceleration positive or negative?

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Presentation transcript:

What kind of acceleration is being demonstrated speeding up or slowing down? Is the acceleration positive or negative?

Newton’s 2 nd law lab whiteboard questions: Sketch the graph of acceleration vs. force. What is held constant? What is the relationship (direct or inverse)? Is the relationship different when a different cart mass is used? When calculating the slope of the line we are finding ∆ / ∆, which has the units ____. Sketch the graph of acceleration vs. mass. What is held constant? What is the relationship (direct or inverse)? When calculating the slope of the line we are finding ∆ / ∆, which has the units ____.

Where are the places in this lab that would cause incorrect results? If it was possible to run an experiment to keep acceleration constant, what do you think the relationship would be between force and mass?

According to Newton’s 2 nd Law If the force is held constant If the mass is held constant If the acceleration is held constant the relationship between mass and acceleration is direct/inverse. the relationship between force and acceleration is direct/inverse. the relationship between mass and force is direct/inverse. In this situation... ∑F = ma

Explain each situation using Newton’s 2 nd law A truck loaded with sand has an acceleration of 0.5 m/s 2 on the highway. If the driver doesn’t change how he is pressing on the gas pedal, what happens to the truck’s acceleration if sand leaks at a constant rate from a hole in the truck bed? The two hockey players are the same size but #22 is speeding up at a greater rate. Compare the forces

Slope = Δa / Δf Σ f am So... If the slope is flipped over ( Δf / Δa ) we will find the mass of the cart in kg

Slope = Δa / Δm Σ f am

Slope = Δa / 1/ Δ m Slope = Δa * Δm Σ f am