2.1- Forces And Their Effects Flashcards
When will an object remain stationary?
When the resultant force is 0
What happens when the resultant force is not 0?
The object accelerates in the direction of the resultant force
What represents speed in a distance-time graph?
Gradient
Velocity
Speed in a given direction
What does gradient on a velocity-time graph represent?
Acceleration
What forces are acting on an object at a steady speed?
Resistive and driving, which are equal
What affects a drivers reaction time? (3)
> alcohol… Rowdy?
tiredness
drugs
What happens when brakes are applied?
Kinetic energy of vehicle is reduced but heat of wheels increases because of the work done by the friction force between the wheels and the brakes
How can braking distance vary? (4)
> icy roads
wet roads
bad brakes
bad tyres
The faster an object moves through a fluid…
The greater the frictional force acting on it
How does a parachute reduce terminal velocity? (2)
> increase in surface area
>therefore an increase in air resistance
Newtons =
Mass x gravitational field strength
When an object is stretched…
Elastic potential energy is stored
