# Shared Flashcard Set

## Details

Science - Physics
Year 10 Science Physics
29
Physics
02/27/2016

Term
 what is a force?
Definition
 a push, pull or twist on an object resulting from the object's interaction with another object
Term
 forces only exist..
Definition
 as a result of an interaction
Term
 effects of forces
Definition
 -change in shape-start moving/stop moving-accelerate/decelerate
Term
 difference between contact and non-contact force
Definition
 contact: forces that are exerted through the direct contact of two or of two or more surfaces. EG pushing a trolley non-contact: do not require any physical connection. EG gravity pulling down an object
Term
 unit used to measure force
Definition
 newton (N) -> the composite of mass and acceleration
Term
 equipment used to measure force
Definition
 -a force meter, otherwise known as a newton spring balance-a dynometer
Term
 How to represent forces in a diagram
Definition
 -Gravity: F(G) the magnitude is usually 9.8m/s2-Normal: F(N) the magnitude when balanced is equal to gravity-Tension: F(T) the magnitude is any (up to breaking load)-Friction: F(Fr) the direction is opposed to relative motion
Term
 vector quantity
Definition
 a quantity that has both magnitude and direction. for example if you throw a ball TWICE AS HARD and to the LEFT. A force is a vector quantity because to fully describe it you must describe both the magnitude and direction.
Term
 force equilibrium
Definition
 a state in which all influences acting on an object cancel each other out so that a balanced equation results.
Term
 what happens to an object when forces are not in equilibrium?
Definition
 an objects motion will change in the direction of the superior force
Term
 Newton's First Law of Motion
Definition
 An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Often referred to as the law of inertia.
Term
 Inertia
Definition
 The tendancy of an object to resist any changes to its motion
Term
 Example of Newton's First Law of Motion
Definition
 A stationary object will resist changes to its motion by remaining stationary.
Term
 Newton's Second Law of Motion
Definition
 The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Term
 F=ma calculations
Definition
 The force acting on an object is equal to the mass of the object times its acceleration. The force is measured in Newtons, the acceleration is measured in m/s/s and the mass is measured in kilograms.
Term
 Newton's Third Law of Motion
Definition
 For every action, there is an equal and opposite reaction.
Term
 Examples of Newton's Third Law of Motion
Definition
 When you sit on a chair your body acts on the chair with one force and the chair reacts with another force on you.
Term
 Define mass and weight
Definition
 The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. The mass of an object is the quantity of matter in an object.
Term
 Define work and give examples
Definition
 Work is done when a force acts on an object over a distance. It is also done when energy is transformed.
Term
 How do you find the work done?
Definition
 Work=force x distance (or displacement)
Term
 Define power
Definition
 The rate at which work is done.
Term
 How do you find the power?
Definition
 Power= work รท time
Term
 Define kinetic energy
Definition
 The energy an object possesses due to its motion.
Term
 Define potential energy
Definition
 The energy an object has due to its position in a force field or that a system has due to its configuration.
Term
 Formula for kinetic energy
Definition
 Ek= 1/2 mv2 (squared)
Term
 Formula for potential energy
Definition
 Ep= mgh
Term
 Types of potential energy
Definition
 Gravitational potential energy, chemical potential energy or elastic potential energy
Term
 What is the net force
Definition
 The sum of all the forces acting on an object
Term
 Define matter
Definition
 A substance that has inertia and occupies physical space
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