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10 questions
A force that opposes motion between any surfaces that are in contact.
gravity
acceleration
friction
direction
Which type of friction is shown in the picture?
rolling
fluid
static
sliding
Sanding wood with sandpaper will ______ the friction.
increase
decrease
Which type of friction is shown in the picture?
fluid
static
rolling
sliding
If the following objects were dropped from the same height, which one would hit the floor first?
Which type of friction is shown in the picture?
rolling
static
fluid
sliding
Adding oil will ________ friction on gear chains.
increase
decrease
Which type of friction is shown in the picture?
fluid
static
rolling
sliding
Give an example of a time when MORE friction is needed.
Give an example of a time when LESS friction is needed.
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