Any 2: slows moving objects, produces unnecessary heat and noise, damages / wears out surfaces that are in contact.
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
What is the equation to calculate force? Force= _________ _____ _________
Force = Mass x Acceleration
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.
What does the arrow in a diagram show? (2 things)
Direction and Magnitude
What is the magnitude of a force?
The size of the force acting on an object.
True or False: Heavier objects require more force to move and stop.
True
True or False: Friction speeds up moving objects.
False: Friction slows down moving objects.
Name 2 factors affecting friction.
Any 2: texture of the surface, weight, amount of surfaces contacting each other.
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.
What is a force?
A push or pull applied to an object.
What is the force that keeps everything on Earth from flying into the air?
Gravity
What is the type of force when 2 surfaces rub together?
Friction
True or False: Friction allows us to grip objects and to stand up are advantages.
True
True or False: Lighter objects require less force to stop than heavier objects.
True
What unit do we use to measure force?
Newtons
What device is used to measure force?
Spring Balance
True or False: Wet roads allow more friction than dry roads.
False
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