Motion
What Total Things Must You Know To Calculate Speed
Total Distance/Total Time
What is the Sl unit of force?
Newton (N)
Why does friction occur?
- Opposing forces
- Microscopic hills & valleys stick
What is gravity?
Force of attraction between objects.
The answer is >:)
>:)
What Is The Difference Between Speed And Velocity
V=Speed In A Direction
S=Distance In A Specific Time
What is a force?
A push or pull.
Describe two ways friction can be increased.
1. Rougher surface
2. Increase force
What is force of gravity related to?
1. mass
2. distance
The answer is >:(
>:(
Why is it more helpful to know a tornado's velocity rather than speed?
Velocity tells the direction of the tornado so people can get out of danger.
What may happen when an object receives unbalanced forces?
It may move.
Name three ways friction can be reduced.
1. lubricant (oil, wax, grease)
2. sliding or rolling
3. make surface smoother
What is the law of universal gravitation?
1. Larger mass = more gravity
2. Greater distance = less gravity
The answer as :D
:D
Emily can skateboard 120 meters in 8 seconds. What is her average speed?
120m/8s = 15 m/s
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.
30 N east
What are harmful effects of friction?
1. heat
2. wearing out the object
3. skin injuries
What is the SI unit for mass?
kilogram
The answer is :P
:P
A kangaroo hops 60 meters to the east in 5 seconds. What is the kangaroo's velocity?
60m/5s = 12 m/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?
1. brakes on a car, bike, or train...
2. objects stay put
3. tread on shoes, tires, etc...
Describe two difference between weight and mass.
1. Weight is force of gravity on an object.
2. Mass never changes (amount of matter in an object)
The answer is >:E
>:E