definitions
a force is
a push, pull, or twist
an object in motion will stay in motion, and an object at rest will ____________________ according to newton's first law
stay at rest
15 N
if there are forces with equal vectors in opposite directions, the object is (in motion / at rest)
at rest
the sum of forces acting on an object, it's value is zero when balanced
net force
newton's second law states
there is a relationship between force, mass, and acceleration / f=m*a
The net force acting on a truck is 25,000 N. The truck has a mass of 400 kg. What is the acceleration of the truck?
62.5 m/s2
draw a free body diagram for a backpack on a hook in the coatroom
*ms. opie checks* force of the hook up, force of gravity down
acceleration is a change in...
speed or direction (NEED BOTH FOR POINTS)
every action has an ___________________________________ according to newton's third law
equal but opposite reaction
10.8 N of force are acting on a small marble. It is traveling with an acceleration of 60 m/s2. what is its mass
0.18 kg
CAPTAIN'S CHALLENGE!: draw a free body diagram for a kid jumping on a trampoline that is moving upward
force of gravity down, force of springs up, F spring must be greater
the direction and magnitude of the force are shown in it's
vector
two marbles dropped from the same ramp height will travel ______________________ after colliding
the same distance in opposite directions
a sledder is traveling at a constant speed of 12 m/s. It's mass is 40 kg. What is the net force acting on the sledder?
0 N! tricky! It's traveling at a constant speed so there is NO acceleration!
draw a free body diagram for a hockey puck in motion on ice, accelerating right toward the goal
ms. opie will check
a force that can attract or repel even from a distance
non-contact force
the force meters we used in lab are an example of Newton's _____________ law because ____________________
third, equal but opposite
CAPTAIN'S CHALLENGE: a tug of war rope is being pulled be two kids (50 kg and 35 kg) on one side with an acceleration of 4.5 m/s2 and an adult with a mass of 112 kg and an acceleration of 3.8 m/s2. who wins? by how much?
the adult by 43.1 N
a skydiver jumps out of a plane. draw a free body diagram of them as they accelerate downwards
ms. opie will check