Please check my answers, and i'm unsure of the third problem so if you can please explain.
Which statement about friction is true?
Static friction and kinetic friction in a system always act in the same direction as each other and in the opposite direction of the applied force.
Static friction and kinetic friction in a system always act in opposite directions of each other and in the opposite direction of the applied force.****
Static friction and kinetic friction in a system always act in opposite directions of each other and in the same direction as the applied force.
Static friction and kinetic friction in a system always act in the same direction as each other and in the same direction as the applied force.
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A brick is resting on a smooth wooden board that is at a 30° angle. What is one way to overcome the static friction that is holding the brick in place?(1 point)
lower the board so it's level with the ground
roughen up the texture of the wooden board
raise the board to a higher angle****
press down on the brick in a direction that is perpendicular to the board
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A student uses a spring scale attached to a textbook to compare the static and kinetic friction between the textbook and the top of a lab table. If the scale measures 1,580 g while the student is pulling the sliding book along the table, which reading on the scale could have been possible at the moment the student overcame the static friction?(1 point)
1,860 g
1,140 g
1,580 g
820 g******
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In which example is kinetic friction most involved?(1 point)
a sled stuck on a snowy hill
a bottle of water wedged in a vending machine
an explorer unsuccessfully pushing on a massive stone that is blocking the entrance to a cave
a volleyball player sliding across the court while diving for the ball*******
1 answer
2 answers