AP Physics: Force-Time Graphs and Impulse

Mr. Andersen explains force-time graphs using the Saturn 5 rocket as an example. He discusses how the area under the graph represents impulse, which is equivalent to the change in momentum. The video includes a detailed calculation of the change in velocity for the Saturn 5 rocket, considering constant mass. It also covers how to calculate impulse using geometric shapes on a force-time graph. The video emphasizes the equivalence of impulse and momentum change, both in units and direction.

What is the force applied by the first stage of the Saturn 5 rocket?

• 10 million newtons

• 1 million newtons

• 4 million newtons

• 34 million newtons

How is impulse represented in physics?

• As a vector quantity

• As a constant value

• As a scalar quantity

• As a unitless number

What is the relationship between impulse and change in momentum?

• Impulse is twice the change in momentum

• Impulse is unrelated to change in momentum

• Impulse is half of the change in momentum

• Impulse is equal to the change in momentum

In the example of the Saturn 5 rocket, what is the calculated change in velocity for the first stage?

• 2000 meters per second

• 1500 meters per second

• 2756 meters per second

• 1900 meters per second

Why does the actual change in velocity differ from the calculated value in the Saturn 5 example?

• The force applied was incorrect

• The mass of the rocket changes as fuel is used

• The time of force application was miscalculated

• The rocket's trajectory was altered

In AP Physics problems, what assumption is made about the mass of objects?

• Mass is infinite

• Mass is negligible

• Mass is constant

• Mass is variable

How do you calculate impulse from a force-time graph?

• By counting the number of peaks in the graph

• By calculating the area under the graph

• By finding the slope of the graph

• By measuring the height of the graph

What is the impulse if a 30 newton force is applied for 30 seconds?

• 1500 newton seconds

• 1200 newton seconds

• 900 newton seconds

• 600 newton seconds

What geometric shape is used to calculate impulse in the example provided?

• Square

• Trapezoid

• Circle

• Rectangle

If the change in momentum is 1500 kg m/s and the mass is 0.5 kg, what is the change in velocity?

• 500 m/s

• 750 m/s

• 1500 m/s

• 3000 m/s