Cards In This Deck

• $$\begin{gathered} \text{True or False? } \\ \text{A ball of mass }m\text{ hits a wall with speed }u\text{ and rebounds with speed }v\text{. The magnitude of the impulse exerted on the ball is }m(v-u)\text{.} \end{gathered}$$
  $$\begin{gathered} \text{❌ False} \\ \text{✅ Correct Answer: }m(v+u)\text{ (assuming }u\text{ and }v\text{ are speeds).} \\ \text{Momentum is a vector. If the initial velocity is }u\text{, the rebound velocity is }-v\text{. } \\ \text{Impulse = }m(-v)-mu=-m(v+u)\text{. The magnitude is }m(v+u)\text{.} \end{gathered}$$
• $\text{You are given a Force-Time graph. How do you calculate the Impulse from this graph?}$
  $\text{Calculate the area under the graph between the given time limits.}$
• $\text{Formula for Impulse (}I\text{) involving Force (}F\text{)?}$
  $$\begin{gathered} I=Ft \\ \text{(for a constant force)} \end{gathered}$$
• $$\begin{gathered} \text{True or False? } \\ \text{Impulse is a scalar quantity because it is calculated using mass and time.} \end{gathered}$$
  $$\begin{gathered} \text{❌ False} \\ \text{Impulse is a vector quantity. It has the same direction as the change in momentum (or the force applied).} \end{gathered}$$