motion
what two things must know to calculate speed
total distance and total time
what is a force
a push or pull
what type of force opposes motion, causing moving object to slow down and or stop.
Friction
what is gravity
force attraction between objects
what is the difference between speed and velocity
velocity has a direction. speed is distance traveled over time.
what is the si unit of the force
newtons (N)
a women pushing a stowler is what kind of force.
applied force
what two things affect gravity
mass and distance
Emily can skateboard 120 meters in 8 seconds what her average seed.
15 mls
what may happen when a object receives unbalanced forces
it may move
describe two ways friction can be reduce
applied lubricant and
smooth suface
what is the si unit for mass
kilograms (KG)
A kangaroo hops 60 meters to the east in 5 seconds. what is the kangaroos velocity.
12 mls east
clay and Tyler were helping a friend move a couch. clay pushed the couch with 25n east and Tyler pushed with 15 n east. Clay little sister pushed back at 10N west calculate the net force.
30N east
the force of friction exerted by a suface depends on
the smoothes of the suface
describe two differences between weight and mass
wieght is force of gravity on an object.
and mass never changes.
why is it more helpful to know a tornado velocity rather than its speed
velocity tells direction, allowing people to get out of the the danger and more in a safe direction
describe three different ways you can accelerate when riding a bike
slow down and speed up and change direction
draw arrows to show the forces acting on the wagon.
gravity force and normal force
what is the law of universal gravitation
larger
mass=more gravity
and greater
distance= less gravity