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Scalars and vectors

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**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.

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**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

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**Types of force you need to know……**

Gravity Friction Air resistance Magnetism Tension Electrostatic Nuclear Compression

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**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

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**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

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**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

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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

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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

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**A scalar quantity only has Magnitude**

Scalar quantities A scalar quantity only has Magnitude

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**Scalar quantities Energy Time Mass Volume Area Temperature Charge**

Distance Speed Pressure Density Power

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Vector quantities A scalar quantity has Magnitude And direction

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Vector quantities Displacement Velocity Acceleration Force Momentum

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To do P46 & 47 Answer all questions

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