Forces and Me
I am standing on the ground. Draw an FBD for me.
FN, Fg
What is Fnet equal to for a set of balanced forces?
Fnet = 0N
Force = mass x acceleration
Newton's 2nd Law of Motion
N
Newtons
A vector
I throw a ball up in the air, what force(s) are acting on the ball when it is in the air?
Fg
Two students push a box with a mass of 100kg. They push the box together to the right. Are the forces from the two students balanced or unbalanced?
Unbalanced (because they are both applying force in the same direction)
A baseball rolls across the grass until it comes to a complete stop.
Newton's 1st Law of Motion
Fnet
Net (Total) Force
Force of friction (Ff)
I push a box to the left, across the ground. Draw an FBD for this scenario.
Fg, FN
Fpush, Ff
The science teachers compete against the english teachers in tug-o-war. There are four english teachers and three science teachers and they all pull with as much force as they can. The flag tied to the center of the rope does not move left or right.
Balanced forces
A rocket is propelled into space by the ignition of rocket fuel
Newton's 3rd Law of Motion
Fnet = ? * a
mass (m)
DAILY DOUBLE
T/F: An object in motion will eventually stop without any applied force
DAILY DOUBLE
I have a mass of 80kg, what is my weight in Newtons (Force of Gravity)?
T/F: unbalanced forces acting on an object always cause that object to accelerate
True
A knight in shining armor is running (north) into battle. She has a mass of 45kg and is accelerating at a pace of 3m/ss. What is the knight's Fnet?
135N North
ᐧ
This term is used to represent how resistant an object is to changing its motion.
Inertia
If I am accelerating down a hill (and no one pushed me), what forces are acting on me?
Force of Gravity (Fg), Force of Friction (Ff)
Gema and Cristina are both rolling hamburgers across the kitchen floor. Gema is rolling her burgers with a force of 20N and Cristina's burgers are rolling with an initial acceleration of 10m/s2. If every burger weighs 0.5kg, who is rolling their burger with more force?
Gema (20N)
Cristina (5N)
If two rocks (rock 1 is 10kg and rock 2 is 5kg) are thrown to the right with a force of 100N, which rock will have the bigger acceleration?
Rock 2 (5kg)
Remember F = ma, so with a constant force, the bigger the mass, the smaller the acceleration
a = ? / t
velocity (v)
A knight bravely pushes a sleeping dragon away from the front of the castle gates (to the right). Draw an FBD
Fg, FN
Fknight, Ff