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# 7Sci Chapt.17 Review

### Matter in Motion

Opposes motion between surfaces that are touching friction
unit of force newton
Is determined by combining forces. net force
acceleration is the rate at which ___________ changes velocity
What is the measure of gravitational force on an object? weight
If a student rides her bicycle on a straight road and does not speed up or slow down, she is traveling with a constant _________. velocity
What is a push or a pull, expressed in newtons,and can cause an object to speed up, slow down, or change direction. Force
If you are a spacecraft that has been launched into space, your weight would..... decrease because gravitational force is decreasing
The gravitational force between 1kg of lead and Earth is __________the gravitational force between 1kg of marshmallows and Earth. the same as
What is the relationship between a reference point and motion? Motion occurs when an object changes postion over time when compared with a reference point.
How is it possible to be accelerating but traveling at a constant speed? Acceleration can occur simply by a change in direction.
How can you find the center of mass of an object? You can find the center by spinning the object.
Which can change, mass or weight? weight changes as the gravitational force changes
A kangaroo hops 60 m to the east in 5 s. What is the kangaroo's average speed? 12m/s
a measure of the amount of matter in an object mass
All matter has mass and is affected by ______? gravity
The force of gravity is directly related to the amount of _______of the objects. mass
What is an example of kinetic friction? a box SLIDING on a floor
What is an example of static friction? a worker pushing a NON-MOVING box
What are two factors that determine the amount of friction? force and roughness of the surfaces
Created by: ahsimmon