P9 and p10 Flashcards
What is the equasion of the speed of an object?
V= s/t
How els can v=s/t be given as?
S= v x t or t=s/v
What does volicity mean?
Spedd in a given direction
What is a vector?
A physical quantity that has a directionnas awell as a magnitude
What is a scalar
A physical magnitude only and does not have a direction
What is the equasion for acceleration
A=v/t
What can be used to measure veloicty changes?
A motion sesnsor linked to a computer.
What has to be zero if the velocity time graph is horizontal?
The acceleration must be zero
What does the area under the line on a velocity time graph represent?
Distance travelled
The greater the resultant force the greater the…
The greater the objects acceleration
The greater the mass of an object the……
Smaller its acceleratioj for a given force
What is the equasion ofr the resultant force acting on an object?
F=ma
Hwo much does an object accerlerate when acted on by only gravity
10m/s2
What has to be at zero when an object is moving at terminal velocity?
The resulatant force
What opposes the driving ofrce of a vehicle
Friction and air resistnace
What does stopping distance depend on?
Braking and thinking distance
What can effect the braking distnace of a car?
Weather thinking distance and car conditions.
What is the equasion of the braking force of a vehic;e?
F= m a
What is the equation for momentum of an object?
P= m v
What is the units for momentum?
Kg m/s
What is a closed system?
A system in which the total momentum before an event is the same as the total momentum after the event
What is described as elastic?
An object that returns to its original shape after being moved by a force
What is extension?
The differnece between the length of the object and its orginial length
