Physics Flashcards
(24 cards)
What is the formula for speed?
Distance / time = speed
What is velocity?
Speed with a set direction
What is the difference between a velocity-time and a distance time graph?
In a velocity time graph a diagonal line repents acceleration or deceleration and a stariaght line shows constant velocity but in a distance time graph a straight line shows it has stopped and a diaganel line is movement.
What is terminal velocity?
The maximum speed an object can reach when falling
How do you measure gravitational force?
gravitational force = wight / mass
Name Newton’s 1st law?
An object will not move unless influenced by a force
What is stopping distance?
Stopping distance has two parts:
1) thinking distance - this is the time it takes for a drivers foot to hit the pedal after the see the object.
2) Breaking Distance - this is the amount of time it takes the car to fully stop
What is hookes law?
When a load is doubles so is the extension of the spring
What is meant by an elastic object?
An object that when changes will go back to its a original shape
What is meant by an plastic object?
An object that when changes will not go back to its a original shape
How do you figure out force from acceleration and mass?
F= m x a
How do you figure out the spring constant?
Force / extension = spring constant
What is a vector quantity?
Quantities measured with number and units with a set direction
What is a scalar quantity?
Quantities measured with numbers and units
Give an 2 examples of:
1) vector quantity
2) scalar quantity
1) velocity, acceleration, force, weight
2) mass, length, speed, teamprsture
on a distance-time graph what is one the x axis and what is on the y?
x=time
y=distance
How do you figure out average speed?
distance/time taken
how do you figure out acceleration (a) from change in velocity (v-u) and time taken (t)?
change in velocity/time taken
or
a= (v-u) / t
how do you figure out acceleration from a velocity time graph?
the gradient
on a velocity time graph how do you figure out distance?
the area under the line will be the distance
if a car is driving with 200N of force and friction is supplying 150N of force what is the resultant force?
50N forward
If the average gravitational pull on a planet is 5 and my mass is 60kg how much is my wight?
300N
What are some factors effecting vehicle stopping distance? name at least 2: a) road conditions b) driver conditions c) car conditions
a) wet roads, mist, snow, icy roads.
b) drunk, under the influence of drugs, fatigue (tiredness), reaction time
c) worn out tyres, worn out brakes, speed, mass
how do you figure out final speed?
(final speed)squared = (initial speed)squared + (2 x acceleration x distance moved)
