P8 Flashcards
What is a scalar quantity?
A quantity that only has a magnitude and isn’t direction dependent.
What is a vector quantity?
A quantity that has both a magnitude and an associated direction.
How is a vector quantity represented?
As an arrow. The length of the arrow represents the magnitude, and the arrow points in the associated direction.
What is force?
A push or pull acting on an object due to an interaction with another object.
What are the categories of forces?
- Contact forces (objects touching) 2. Non-contact forces (objects separated)
What are examples of contact forces?
- Friction 2. Air resistance 3. Tension
What are examples of non-contact forces?
- Gravitational forces 2. Electrostatic forces 3. Magnetic forces
Is force a vector or scalar?
Vector. It has both a magnitude and an associated direction.
What are examples of vector quantities?
- Velocity 2. Displacement 3. Force
What are examples of scalar quantities?
- Temperature 2. Time 3. Mass 4. Speed 5. Distance 6. Energy
What is weight?
The force that acts on an object due to gravity and the object’s mass.
What is the formula for weight?
Weight = mass x gravitational field strength.
What depends on weight?
The object’s mass and the gravitational field strength at the given position in the field.
What is the unit of weight?
The Newton (N).
What is the centre of mass?
The single point where an object’s weight can be considered to act through.
