Linear Kinetics Flashcards
Newton’s 2nd law can be expressed as an equation. State this equation.
F = ma
What is the equation used to calculate linear momentum?
State the units too.
Linear momentum = mass x velocity
kg/m/s = kg x m/s
Linear momentum is important in collision sports such as rugby? Why is this identified as an important component?
Higher the mass, higher the velocity = higher the linear momentum.
More momentum in collision sports means you are more likely to win possession/attack better.
What is the equation used to calculate impulse?
State the units of each component.
Impulse = force x time
Ns = N x s
Considering F = ma and a = (v - u)/t, what is impulse equivalent to?
F = ma F = m(v - u)/t Ft = mv - mv
Hence, impulse = change in momentum.
On a force/time graph, if the positive impulse and negative impulse area is the same underneath the curve, what can be said about the change in velocity and momentum?
- Change in velocity = 0
2. Change in momentum = 0
Using impulse and mass, how can we calculate change in velocity?
Change in velocity = impulse / mass
In order to calculate vertical impulse of a human, what must be subtracted from the the total force (Fz) to give the net impulse?
Body weight.
Define energy.
The quantitative property that must be transferred to a body or physical system to perform work on the body.
1 joule is the energy required to accelerate 1kg of mass at what speed and for a distance of what?
1m/s^2 through a distance of 1m.
Mechanical energy can be classified into two groups, what are these?
- Potential energy
2. Kinetic energy
Define potential energy.
The energy that a body possesses due to its position relative to the earth’s surface.
What equation can be used to calculate potential energy (PE)?
PE = mgh
Define kinetic energy.
The energy that a body possesses due to its movement.
What equation can be used to calculate kinetic energy (KE)?
KE = 1/2 mv^2
