Additional Physics 40 flashcards Jack Young's
What will happen if the resultant force acting on a stationary object is zero?
The object will stay stationary.
What is the unit of mass?
Kg
How are force, mass and acceleration linked?
force=mass*acceleration
Unit for force?
Newtons (N)
Unit for acceleration?
metres per second squared
Velocity units?
Metres per second (m/s)
what does a horizontal line on a distance on a distance-time graph represent?
the object is stationary.
what is the different between speed and velocity?
the velocity of an object is its speed in a given direction.
what does the gradient of a velocity-time graph represent?
acceleration.
What are the units for acceleration?
Metres per second squared
what does a horizontal line on a velocity-time graph represent?
the object is moving at a constant velocity.
how do you calculate the acceleration from a velocity-time graph?
use a = (v-u)/t where a=acceleration (m/s^2), v=final velocity (m/s), u=initial velocity (m/s) and t=time (s).
what happens to the forces when a vehicle travels at a steady speed?
the resistive forces balance the driving force.
which force are most of the resistive forces acting on a vehicle caused by?
air resistance.
how is the breaking force affected by speed?
the bigger the speed the greater the breaking force required to stop it in a certain distance.