All Flashcards
How do you calculate the change in momentum (Δp)?
- Determine the final momentum (p). 2. Determine the initial momentum (p₀). 3. Subtract the initial momentum from the final momentum: Δp = p - p₀.
How do you calculate impulse (J) using the average force and time interval?
- Determine the average force (F_avg) acting on the object. 2. Determine the time interval (Δt) over which the force acts. 3. Multiply the average force by the time interval: J = F_avg * Δt.
How do you determine the net external force from a momentum-time graph?
- Find the slope of the momentum-time graph at the desired point. 2. The slope represents the net external force at that instant: F_net = Δp/Δt.
How do you determine the impulse from a force-time graph?
- Plot Force vs time on a graph. 2. Calculate the area under the force-time graph. 3. The area represents the total impulse delivered.
How can Newton's Second Law be derived from the Impulse-Momentum Theorem?
- Start with the Impulse-Momentum Theorem: J = Δp. 2. Substitute J with F_net * Δt and Δp with m * Δv. 3. Rearrange the equation to get: F_net = m * (Δv/Δt) = ma.
How do you calculate impulse using a force-time graph?
The impulse is equal to the area under the force-time graph between the initial and final times.
How do you determine the net external force from a momentum-time graph?
The net external force is equal to the slope of the momentum-time graph at a given point in time.
What are the steps to calculate the change in momentum?
- Determine the initial momentum (). 2. Determine the final momentum (). 3. Subtract the initial momentum from the final momentum:
How to calculate impulse when the force is a function of time?
- Identify the net force as a function of time, . 2. Determine the time interval . 3. Integrate the force function over the time interval: .
How do you apply the impulse-momentum theorem to solve a problem?
- Identify the impulse acting on the object. 2. Identify the initial and final momentum of the object. 3. Set the impulse equal to the change in momentum: . 4. Solve for the unknown quantity.
What are the differences between Impulse and Momentum?
Impulse: Change in momentum due to force acting over time, measured in N⋅s. | Momentum: Mass in motion, measured in kg⋅m/s.
What are the differences between a large force over a short time and a small force over a long time in terms of impulse?
Large force, short time: Results in a large impulse if the product of force and time is significant. | Small force, long time: Can also result in a large impulse if the product of force and time is significant.
What are the differences between a force-time graph and a momentum-time graph?
Force-time graph: Area under the curve represents impulse. | Momentum-time graph: Slope represents net external force.
What are the differences between positive and negative change in momentum?
Positive change in momentum: Indicates an increase in momentum (object speeds up in the positive direction). | Negative change in momentum: Indicates a decrease in momentum (object slows down or changes direction).
What are the differences between Newton's Second Law and the Impulse-Momentum Theorem?
Newton's Second Law: F = ma, applies when mass is constant. | Impulse-Momentum Theorem: J = Δp, more general and applies even when mass is not constant.