True or False: Heavier objects require more force to move and stop.
True
True or False: Lighter objects require less force to stop than heavier objects.
True
Name 2 disadvantges of friction.
Any 2: slows moving objects, produces unnecessary heat and noise, damages / wears out surfaces that are in contact.
What is a force?
A push or pull applied to an object.
What is the magnitude of a force?
The size of the force acting on an object.
Complete Newton's Third Law: For every action_________________.
there is an equal and opposite reaction.
What do we call the overall / single force acting on an object?
Resultant Force
Name 2 reasons a big rock is harder to move than a small rock.
Heavier, increased friction, requires more force to move, more of the surface contacting.
Name 2 advantages of friction.
Any 2: allows objects to remain still, allows us to grip things and walk, prevents slipping, allows moving objects to stop, produces heat to start a fire.
True or False: Wet roads allow more friction than dry roads.
False
What device is used to measure force?
Spring Balance
What is the equation to calculate force? Force= _________ _____ _________
Force = Mass x Acceleration
True or False: Friction speeds up moving objects.
False: Friction slows down moving objects.
What is the force that keeps everything on Earth from flying into the air?
Gravity
True or False: Friction allows us to grip objects and to stand up are advantages.
True
What is the type of force when 2 surfaces rub together?
Friction
What does the arrow in a diagram show? (2 things)
Direction and Magnitude
Name 2 factors affecting friction.
Any 2: texture of the surface, weight, amount of surfaces contacting each other.
What unit do we use to measure force?
Newtons
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