Scalars and vectors.

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Presentation transcript:

Scalars and vectors

What is a force? A force is a push, pull or twist. This is a FLASH animation. Please click on the arrows to show the force.

Say if the following are pushes, pulls or twists: Writing on paper Typing on a keyboard Tug-of-war Unscrewing the top off a bottle Posting a letter through a door Putting on a pair of socks Turning a door handle Push Pull Twist Push Pull Twist

Types of force you need to know…… Gravity Friction Air resistance Magnetism Tension Electrostatic Nuclear Compression

Describing the forces Magnetism Friction Compression Tension The force you get when two material rub together The force you get when a material is being stretched The force you get when a material is being squashed The force that enables compasses to work Magnetism Friction Compression Tension

Describing the forces Gravity Nuclear Air resistance Electrostatic The force that holds the particles in a nucleus together The force you get when an object moves through air The force that exists between all objects with mass The force you get between two charged objects

Contact and non-contact If two objects or materials need to be touching for the force to have an effect then it is a C________ force. Examples: If two objects or materials do not need to be t______ for the force to have an effect then it is a NON CONTACT force. ONTACT Friction Air resistance ouching Gravity Electrostatic Magnetic

Gravity Gravity is an attractive f____ that exists between all m_____. Gravity is always a_______. The l____ the mass is, the greater the gravitational attraction. The f_____ away a mass is, the less the gravitational attraction. Your w____ is the pull of the Earth’s gravity on your body. If you stood on the M___ you would weigh less than on Earth. This is because the Moon has less mass than Earth, so the Moon’s g_________ pull is weaker than the Earth’s. orce asses ttractive arger urther eight The Moon is kept in orbit around the Earth due to gravity. oon ravitational

Supplement Demonstrate an understanding of the difference between scalars and vectors and give common examples Add vectors by graphical representation to determine a resultant Determine graphically the resultant of two vectors

A scalar quantity only has Magnitude Scalar quantities A scalar quantity only has Magnitude

Scalar quantities Energy Time Mass Volume Area Temperature Charge Distance Speed Pressure Density Power

Vector quantities A scalar quantity has Magnitude And direction

Vector quantities Displacement Velocity Acceleration Force Momentum

To do P46 & 47 Answer all questions