Combined Physics - 6.5
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What are physical quantities with only magnitude (and no direction)?
Scalar quantities
What are physical quantities with magnitude and direction?
Vector quantities
Give some examples of scalar quantities
• Speed • Distance • Mass • Temperature • Time
Give some examples of vector quantities
• Force • Velocity • Displacement • Acceleration • Momentum
What does the arrow for a vector quantity show?
The length of the arrow shows the magnitude and the direction of the arrow shows the direction of the vector quantity
What is a force?
A push or pull acting on an object due to the interaction with another object
What are forces between objects classified as?
Contact or non-contact forces
Describe contact forces
Forces between objects that are physically touching
Describe non-contact forces
Forces between objects that are physically separated
Give some examples of contact forces
• Friction • Air resistance • Tension • Normal contact force
Give some examples of non-contact forces
• Gravitational force • Electrostatic force • Magnetic force
What type of quantity is force?
A vector quantity
What is weight?
The force acting on an object due to gravity
What cause the force of gravity close to the Earth?
The gravitational field around the Earth
If mass it constant, what can affect the weight of an object?
The gravitational field strength at the point where the object is
How can the weight of an object be calculated?
What are the units for gravitational field strength?
Gravitational field strength, g, measured in N/kg
What is an object’s centre of mass?
The weight of an object acting at a single point
What does W ∝ m mean?
The weight and mass of an object are directly proportional
How is weight measured?
A calibrated spring-balance (newton meter)
What is a ‘resultant force’?
A single force, replacing a number of forces, acting upon an object
What has happened if a resultant force moves an object?
Work is done
What is the equation for work done?
When a force causes an object to move through a distance what has happened?
Work is done on the object so a force does work on an object when the force causes a displacement of the object