motion Flashcards
What is a scalar
Measures only size
What is a vector
Measures both size and direction
What is distance
Is how far something is
Is distance a scalar or vector quantity
Scalar
What is displacement
Is how far something is from a particular point
Is displacement scalar or vector quantity
Vector
What is speed
How fast something is
Is speed a scalar or vector
Scalar
What is velocity
How fast something is in a given direction
Is velocity scalar or vector
Vector
What are the five vector quantities
Force ,acceleration,displacement,momentum,velocity
What is the equation for distance
Distance = speed divided by time
what is the equation for acceleration
a= v-u/t
what is acceleration measured in
m/s squared
what is the second equation for acceleration including distnace
v2-u2 = 2xaxd
What does v stand for in the second equation for acceleration
end velocity
what does the u stand for in the second equation for acceleration
Start velocity
what is the equation for force
force = mass x acceleration
What is force measured
newtons
wat is mass measured in
kg
what is the equation for weight
weight = mass x gravitational field strength
What is weight measured in
newtons
why is weight measured in newtons
because weight is a force
what is gravitational field strength measured in
n/kg
what is the equation for momentum
momentum =mass x velocity
what is momentum measured in
kgm/s
what is terminal velocity
wherethe ball is travelling at a constant speed
what is the law of conservation of momentum
The momentum before the collision =the momentum after the collision
What is a closed system
is where no external forces act on it
what is the crumple zone
if you crash into a car the car will crumple reducing the impact
In a distance speed time,what does a horizontal line mean
stationary
in a distance speed time graph ,a line on a slope mean
steady speed
in a distance speed time graph , what does a curved line mean
acceleration
what is deceleration
speeding down
what is the equation for a stopping distance
stopping distace = thinking distance + breaking distance
what four factors effect reaction time
tiredness,distrractions,alchol consumption,drugs
What is the average persons reaction time
0.7s
name three non contact forces
weight,electrostatic force,and magnetic
what is newtons first law
Newton’s first law states that if the result force acting upon an object is zero its acceleration is zero
what is the centripetal force
the force that goes towards the centre of the spinning object ,the bigger the circle then the smaller the force
what is netwon’s second law
the acceleration of an object is directly proportional to the resultant force in the same direction as the force ( and inversely proportional to the mass of object). f=ma
What is Newton’s third law
For every reaction there is an equal and opposite action
Why is the unit for acceleration for meters second squared
because the unit for change in velocity is meters per second and the unit for time is seconds so when you divide meters per seconds by seconds ,you get meters per second squared .
What is 1 hour in seconds
3600s
How many meters r in a mile
1600 meters
In a velocity time graph. What does a horizontal line mean
Constant speed
In a velocity time graph, the area under the graph respresents …
Distance travelled
In a resultant force, when the arrow are pointing in different directions what does it mean
Bigger force- smaller force
In a resultant force , when the arrows r moving in the same directions
Bigger force + smaller force
WHat is thrust
It is the force that move things forward
What is friction
The force that occurs between two objects rubbing together
What is the equation for change of momentum
Final mass - initial mass
What is the second force equation
Final mass - initial mass / time
What is the third force equation
Change in momentum/ time
