Sci - Physics Flashcards
Motion
Objects move from one point of space to another over time
Stationary
Objects remain at the same point of space over a period of time
Speed
A measure of the distance travelled over the time taken
Distance
Used to describe how far an object has travelled from the starting point
Time
Used to describe how long a journey has taken
Formula for Speed
V = d/t
Formula for Acceleration
a = v/t
Acceleration
Change of speed over time
How Acceleration occurs
- If an objects speed changes per second
- Unbalanced force is applied to an object
- If an object changes direction
Friction
The force which always opposes the direction
Drag
Friction that occurs in a fluid or gas
Useful instances of Friction
Walking - Grip
Cycling - Grip
Driving - Grip + Brakes
Air Resistance
When an object falls through air this type of friction occurs
Pressure
How much force is put onto a particular area
Forumula for pressure
P = F/A
Conservation of Energy
Energy cannot be created or destroyed only transformed or transferred
Energy
The ability to do work
Types of Potential energy
- Gravitational potential energy
- Elastic potential energy
- Chemical potential energy
Types of Kinetic energy
- Kinetic Energy
- Heat, sound, radiation, light energy
Potential energy equation
Ep = mgh
Kinetic energy equation
Ek = 1/2mv2
Newtons first law of Motion
An object cannot start, stop, or change direction all by itself
Newtons second law of Motion
The force applied on an object is equal to the product of its mass and accelertation
Newtons third law of Motion
For every action, there is an equal and opposite reaction