Forces Flashcards
what’s motion
Motion is a change in position over time
speed formulae
distance/time
velocity formula
Displacement/Time
How to calculate net force with unbalanced force
unbalanced forces that act in opposite directions need to be subtracted to get the net force.
How to calculate net force with balanced force
The net force of unbalanced forces acting in the same direction is simply the sum of the forces
Avg speed formula
TOTAL distance/TOTAL time
when the velocity changes its either a change in # or ?
Direction or speed
acceleration formula
Change in velocity/time (m/s2)
What is force
A push or pull that makes something move
force formula
Mass x acceleration
If a bee is flying in a circle at constant speed, is the bee accelerating? Justify your answer
Yes, when direction is changed velocity changes and when when velocity changes it accelerates
What is the 1st law of motion/inertia ?
An object in motion will remain in motion unless a force acts upon it
What is inertia?
Matter’s resistance to change in motion
“Objects with more mass has more inertia”
Justify this statement
If two balls of different sizes has the same velocity is easier to stop the small than the big ball because of inertia
What is momentum
measure of how difficult it is to change the inertia of an object
Momentum formula
mass x velocity
what is the 2nd law of motion
The acceleration of an object is equal to the net force/mass of an object
More ____ an object has ,the more force you need to accelerate it
MASS
more force applied to an object the _______ it will accelerate
FASTER
_____ mass will accelerate more
MORE/LESS
LESS
More mass will accelerate ____
MORE/LESS
LESS
When the Net force (NF) is the ______ direction as the velocity the object, it speeds up
SAME/OPPOSITE
SAME direction
When the NF is in the __________ direction as the velocity ,the object slows down
SAME/OPPOSITE
OPPOSITE direction
2 types of forces
BALANCED and UNBALANCED force
Give example for unbalanced force
If you’re riding your bike ,and the wind is blowing in the same direction as you r cycling you will speed up and its an unbalanced force
Give example for balanced force
If you’re riding your bike ,and the wind is blowing in the opposite direction as you r cycling you will slow up and its a balanced force
What is the 3rd law of motion
For ever action there is a equal but opposite reaction
When you strike the ground with your feet, you exert force on earth and earth exerts equal but opposite force on you propelling you forwards. Why doesn’t the Earth move
As the earth is so much more massive than us the same force that causes us to accelerate doesn’t affect the earth(but its there)
