# Science Exam: Physics

Flashcards by Sarah Eberle, updated more than 1 year ago Created by Sarah Eberle over 3 years ago 10 0

### Description

Study Set: Physics ## Resource summary

 Question Answer Speed -Formula: D/T: -Distance over time -The measure of how fast an object is moving Velocity - Formula: v=d/t - Velocity = distance over time - a description of both speed and direction - Unit=m/s Acceleration -Formula: A=Vfinal-Vinitial/Time - Vfinal-Vinitial over time - measures how much an object's velocity changes over time Vector direction Scalar no direction needed Distance how far an object moves in total Displacement the distance an object moves from a starting position Friction Types -rolling -sliding -fluid/air -static Rolling Example: bowling Sliding Example: Ice Skating Fluid/Air Example: air or water resistance Static initial friction when moving an object Forces balanced vs. unbalanced Balanced Force Two forces acting in opposite directions on an object Unbalanced Force gravity or air/fluid friction Action something that occurs Reaction The result of an action or what happens because of the action Newton's Laws there are three of them Newton's 1st Law "An object in motion stays in motion, an object at rest stays at rest with the same speed and velocity unless acted upon by an unbalanced force(Gravity)" - inertia is the tendency of an object to resist change in its velocity: whether in motion or motionless Newton's 2nd Law the acceleration of an object depends on the force acting on the object and the object's mass Newton's 3rd Law Image: Hamilton (image/jpeg) For every action, there is an equal and opposite reaction Kinetic Energy - Formula: KE=1/2m X v^2 -energy in motion/being used to create an action of some kind - measured in Joules Potential Energy Formula: PE=mgh M= Mass G=acceleration of gravity(M/s^2) H= Height - Energy that is not being used - stored energy -the higher something is from Earth's surface the more potential energy it has Momentum Formula: P=mv M=Mass V=Velocity -depends on objects mass and velocity - Newton called it the "Quantity of motion" Conservation of Momentum -states that any time objects collide, the amount of momentum stays the same, but can be transferred between the objects - conservation means that thing is not changing - So in the "Conservation of Momentum", the momentum is not changing it is constant

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