Question

1. what is impulse?

a. change in velocity
b. change in momentum
c. rate of change of velocity
d. rate of change of momentum

1. in which equation of newtons second law is mass assumed to be constant?

a. (mathbf{f}=m a)
b. (mathbf{f}=\frac{delta mathbf{p}}{delta t})
c. (mathbf{f}=delta mathbf{p} delta t)
d. (mathbf{f}=\frac{delta m}{delta a})

1. what is the si unit of momentum?

a. (mathrm{n})
b. (mathrm{kg} cdot mathrm{m})
c. (mathrm{kg} cdot mathrm{m} / mathrm{s})
d. (mathrm{kg} cdot mathrm{m} / mathrm{s}^{2})

1. what is the equation for linear momentum?

a. (mathbf{p}=m mathbf{v})
b. (mathbf{p}=m / mathbf{v})
c. (mathbf{p}=mathrm{mv}^{2})
d. (mathbf{p}=\frac{1}{2} mathrm{mv}^{2})

Explanation:

1. Impulse is defined as the change in momentum. According to the impulse - momentum theorem, \(J=\Delta p\).
2. Newton's second law in the form \(F = ma\) assumes mass \(m\) is constant. When mass is not constant, the more general form \(F=\frac{\Delta p}{\Delta t}\) is used.
3. Momentum \(p = mv\). The SI unit of mass \(m\) is \(kg\) and of velocity \(v\) is \(m/s\). So the SI unit of momentum is \(kg\cdot m/s\).
4. The formula for linear momentum is \(p=mv\).

Answer:

1. b. Change in momentum
2. a. \(F = ma\)
3. c. \(kg\cdot m/s\)
4. a. \(p = mv\)