Chapter 8 Flashcards
What do vector quantities both have?
Magnitude(size) and direction
Name 3 vector quantities :
- velocity
- acceleration
- force
When do vector quantities change?
- magnitudes change
- direction changes
- magnitude and direction change
What do scalar quantities only have?
- Magnitude (size)
Name 3 scalar quantities?
- distance
- speed
- time
When do scalar quantities change?
When their magnitude changes
Name 3 contact forces?
- frictional
- air resistance
- spring force
Name 3 non-contact forces?
- gravitational force
- magnetic force
- nuclear force
What is weight?
The force acting on an object due to gravity
What does the weight of an object depend on?
The strength of the gravitational field at the location of the object
How do you calculate the weight of an object if you know its mass and the strength of the gravitational field?
Weight = Mass (kg) x gravitational Field Strength (N/kg)
What does the amount of work done depend on?
The size on the force of an object and the distance an object moves
What is the equation for work done?
Work Done (J) = Force (N) x Distance (M)
What is a joule?
A measurement for work done or energy
What is a joule derived from?
It’s equal to the energy transferred to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre.