Physics Level 2 - Mechanics

Level 2 external, demonstrate understanding of mechanics

Velocity (v) - unit

Meters per second

Acceleration (a) - unit

Meters per second ²

If traveling in a circle, what direction is acceleration?

Towards the middle of circle.

Resulting in force tension (fc)

If traveling in a circle, what factors can change an objects trajectory?

Decrease in Friction, - e.g ice, gravel oil.

How to decrease the force (and damage) of a collision?

Increase collision time Delta P = F x Delta T

Two requirements for an object to be in equilibrium

All torques and forces are balanced.

Distance (D) - unit

Meters - M

Time (t)- unit

Second - S

Force (F) - unit

Newtons - N

Momentum (p) -unit

kg/ms^-1 or N-s

Potential Energy (unit)

Joule (J)

Kinetic Energy (Unit)

Joule (J)

Work (W) unit

Joule (J)

Power (P) unit

Watts

Spring Constant (k) Unit

Typical N/M^-1

Gravity

9.8ms^-1

Vertical velocity is…

Always changing

Horizontal Velocity…

Remains constant

In order to travel at the same speed (in a circular instance) and object must be…

Constantly accelerating

Newtons first Law

An object at rest will stay at rest and an object in motion will stay in motion unless acted upon by a external force.

Newtons Second Law

Force equals Mass x acceleration.

Newtons Third Law

For every action there is a equal and opposite reaction.

Assumption we make when calculating momentum.

Momentum is conserved & there are no external forces acting.

Elastic collision

Momentum is conserved because no losses due to friction.

Vector (Definition)

Has size and direction

Principal of energy conservation

Energy can not be created or destroyed, but can be transformed from one type to another.