Physics ( forces) Flashcards
What’s the equation of weight
Weight=mass x gravitational field strength
What is weight proportional to
Mass and weight are directly proportional
What is the resultant force of an object
The overall force acting on an object in a direction
What’s the equation of work done
Work done= force x distance
Stretching, bending and compressing does what
Transfers energy
What’s the equation of force when relating to springs
Force= spring constant x extension
What’s the equation of elastic potential energy
Elastic potential energy= 1/2 x spring constant x extension’2
What’s a moment
The turning effect of a force
What’s the equation of the moment of force
Moment of force= force x distance
What’s fluid pressure
When particles in a fluid collide with the walls of a container. Exerting a force
What’s the equation of pressure
Force normal to surface
Pressure =————————————
Area of that surface
What does the pressure of a liquid depend on
Depth and density
What do objects in fluids experience
Upthrust. However if upthrust and weight = the same. The object floats
What’s speed
How fast your going but with no regard to direction
What’s velocity
How fast your going in a given direction
Speed is an example of a
Scaler
Velocity is an example of a
Vector
What’s the equation of acceleration
Change in velocity
Acceleration = —————————
Time
What’s acceleration
How quickly your speeding up( change in velocity in an amount of time)
Whats uniform speed also mean
Constant acceleration
What’s the equation of final velocity
V’2 - u’2= 2 as
What’s stopping distance
The distance needed for a car traveling at a given speed to stop. Depends on: • thinking distance
• Braking distance
What’s thinking distance
Distance traveled before our brain reacts to danger
Depends on: •alcohol
• tiredness
What’s braking distance
Distance traveled by the car after brakes have been pressed. Depends on: • initial speed
• weight of car
• quality of brakes
• condition of tires
What’s the equation for mass
Weight
Mass = —————————————
Gravitational field strength
What can the equation
Ee = 1/2 x spring constant x extension 2
This equation can also be used to find the energy stored
