Forces and motion Flashcards
(26 cards)
is distance a scalar or vector quantity
scalar - as it doesn’t need a specific direction
is velocity a scalar or vector quantity
vector quantity - requires a direction
whats the equation which links speed distance and time
distance = speed x time
state newtons first law for a moving object
if the resultant force on a moving object is zero, the object will remain at constant velocity
what is inertia
the tendency of an object to continue in its current state at rest or in uniform velocity
whats the equation for Newton’s second law
Force = mass x acceleration
What’s Newton’s second law
An objects acceleration is directly proportional to the resultant force acting on it and inversely proportional to its mass
whats inertial mass
a measure of how difficult it is to change the velocity of an object
State newton’s third law
whenever two objects interact, the forces that they exert on each other are always equal and opposite
whats the stopping distance of a vehicle equal to
the sum of the thinking distance and the braking distance
three factors that affect a driver’s reaction time
alcohol, drugs, tiredness
two factors which can affect breaking distance
icy and wet road conditions
tyre / brake conditions
average speed of a person walking
1.5 m/s
What could you use to calulate acceleration
a ticker timer
what is a force
a push or pull that acts on an object due to the interaction with another object
all forces between objects are either… what?
contact: objects are physically touching
non-contact: objects are physically separated
examples of contact forces
friction, air resitstance, tension
examples of non contact forces
gravitational force, electrostatic force and magnetic
is force a vector or scalar quantity
vector
what is weight
weight is the force acting on an object due to gravity
what is the force of gravity close to earth cvaused by
gravitational field around the earth
equation linking gravity mass and weight
weight = mass x gravity (or gravitational field strength)
what is used to measure weight
a newtonmeter
whats a resultant force
a number of forces acting on an object replaced by a single force which has the same effect as all the original forces acting upon the object
