8 Newton's Laws of Motion Flashcards
What is Newton’s first law of motion?
Objects either stay at rest or moves with constant velocity unless acted on by a force
What is Newton’s second law of motion?
F is proportional to m a
or F = ma
what is g?
the acceleration of a falling object acted on by gravity
or
the gravitational field strength at a given position (force of gravity per unit mass of a small object at that position)
what is weight?
the force of gravity acting on an object
what is the formula for weight?
W = mg
what is inertia?
resistance of an object to change its motion
what is the formula for the thrust of a rocket?
T = mg + ma
what is drag force?
the force of fluid resistance on an object moving through the fluid
what is drag force dependent on?
- shape of object
- speed
- viscosity of fluid
what is terminal speed?
the maximum speed reached by an object when the drag force on it is equal and opposite to the force causing the motion of the object
what is thinking distance?
the distance travelled by a vehicle in the time it takes the driver to react
what is the formula for thinking distance?
s = speed x reaction time
what is the formula for braking distance?
s = u²/2a
what is braking distance?
the distance travelled by a car in the time it takes to stop safely from when the brakes are first applied
what is stopping distance?
thinking distance + braking distance
