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What is a force? (2.1)
A push or pull
What are forces described by? (2.1)
Their magnitude and the direction in which they act
When two forces act in the same direction they ____ together. (2.1)
add
When two forces act in opposite directions they combine by ________. (2.1)
subtract
What is net force? (2.1)
The overall force on an object after all the forces are added together
What changes an object's motion? (2.1)
Unbalanced forces
What is Newton's first law of motion? (2.1)
An object at rest will remain at rest and an object in motion will remain in motion
What is mass? (2.1)
The amount of matter in an object
The amount of inertia an object has depends on its ______. (2.1)
mass
What is the formula to find force? (2.2)
Force= Mass X Acceleration
Acceleration and force change in the ______ way. (2.2)
same
Acceleration and mass change in _______ ways. (2.2)
opposite
What is friction? (2.3)
The force that one surface exerts on another when they rub against each other.
What TWO things does the force of friction depend on? (2.3)
The types of surfaces involved and how hard the surfaces push together
What is sliding friction? (2.3)
When surfaces slide over each other
What is rolling friction? (2.3)
When an object rolls over a surface
