Motion
What two things must you know to calculate speed?
Distance over time
What is a force?
What are push or pull?
Describe two ways fricon can be increaseed.
1. roughter surface
2. increase force
What is gravity?
force of attraction between objects
"Don't sniff, ________."
Waft
difference between speed and velocity
v=direction
Clay and Tyler were helping a friend move a couch. Clay pushed the couch with 25 N east and Tyler pushed with 15 N east. Clay's little sister pushed back at 10 N West. Calculate the net force.
(25N + 15N) 10N= 30N east
1. lubrication (oil, way, grease)
2. sliding to rolling
3. make surface smoother
What is the force of gravity related to?
1. Mass
2. Distance
"Always wear _____, Mrs. Nigro."
closed-toed shoes
Emily can skateboard 120 meters in 8 seconds. What is her average speed?
s=d/t 120m/8s= 15m/s
What may happen when an object receives unbalanced forces?
It may move.
What are harmful effects of friction?
-heat
-wearing out an object
-skin injurits
What is the Law of Universal Gravitation?
The greater the mass= more gravity
Greater distance= less gravity
fifth element
Boron
A kangaroo hops 60 meters to the east in 5 seconds. What is the kangaroo's velocity?
s=d/t 60M/5s= 12m/s east
Describe three different ways you can accelerate when riding your bike.
1. change direction
2. slow down
3. speed up
What are helpful effects of friction?
-Brakes on a
-car, bike, train...
-objects stay put
-Tread on shoes tires,...
What is the SI unit for mass?
kilogram
element w/ a surprising name
rutherfordium
Describe two differences between weight and mass.
1. weight is force or gravity on an object
2. Mass never changes (amount of matter in an object)
rearrange the letters: niT
Tin