an object will fall at a constant speed because the resultant force= 0
Explain terminal velocity of a skydiver?
1)at first they accelerate due to there weight (force of gravity)
2)as they speed up air resistance increases
3)the resultantforcereaches0and they fall at a const velocity (this is terminal velocity)
What is resultant force?
when more than one force acts on an object, these forces can be seen as one force that has the same effect as all the forces acting together.
What is newtons 1st law?
an object will remain in the same state of motion unless acted on by an external force
What is newtons2ndlaw?
when the resultantforce is notequal to 0anobject may speedup, slowdownorchangedirection.allofthese class as acceleration.force is directlyproportional to acceleration
What is Newtons 3rd law?
for every action there is an opposite and equal reaction
Give the method for the extension experiment?
setupclapstandwithspring and masses attached
measure the originallengthof the spring before extension with a ruler
add 1Nofweightandmeasure the extension of the spring
repeat for masses2N-6N
Give the variables for the extension experiment?
independent: forceactingon the spring
dependent: extension
control: originallengthofspring
Risk assessment for extension experiment?
wear safety goggles incase spring recoils
What does the term inelastically deformed mean?
if anobjectdoesnotreturn to its originalshape when a force has been applied
What is the difference between distance and displacement?
Distance is a scalar, meaning it only has a magnitude. Displacement is a vector, meaning that it has both magnitude and direction
What is the relationship between acceleration and velocity?
Acceleration is the rate of change of velocity over time.