Write Newton’s second law in component form. Explain impulse with an example.
Answers
Answer:
The vector equation can be written as three component equations: ∑→Fx=m→ax,∑→Fy=m→ay,∑→Fz=m→az.
Explanation:
Impulse in Physics is a term that is used to describe or quantify the effect of force acting over time to change the momentum of an object. It is represented by the symbol J and usually expressed in Newton-seconds or kg m/s.
A cricket player lowers his hand just before catching the ball. This increases the time of impact and decreases the effect of force.
When someone falls from the bed on a floor receives more injuries when compared to falling on a heap of sand. This happens because of the sand yields more than the cemented floor, therefore, increasing the impact time and lowers the impact of force.
Calculation:
We will look at a calculation where the impulse for a ball hits an object and comes to a halt. Here, the object weighs 3.0 kg and has a velocity of 5 m/s before colliding with the object. Find the impulse.
Δ J = p2 – p1
Δ p = m v 2 – m v 1
Δ p = (3.0 kg)(0 m/s) – (3.0 kg)(5 m/s) = -15 kg m/s