Forces and Motion 1
True or False? An object at rest remains at rest unless acted upon by an outside force. An object in motion remains in motion unless acted upon by an outside force.
True
A push or pull
Force
Contact force or Non-contact force?
Hitting a tennis ball with a tennis racquet
Contact Force
Reduces friction
What is a lubricant or liquid?
Energy in motion is called....
Kinetic Energy
What unit is force measured in?
Newtons
A force between two surfaces which prevents them from sliding past one another.
Friction
Forces that cause a change in motion are called..
unbalanced forces
Friction in the air is called...
Air Resistance
What Net Force Value do two equal forces in opposite direction have? (no naked numbers)
0 Newtons
What objects exert gravity?
All Objects
What causes an object to move.
Unbalanced forces
The sum of all forces acting on an object
Net Force
In a game of tug-o-war, what happens when the forces exerted by Team A and Team B are balanced?
neither team wins
Increases the gravitational force between two objects.
What is mass?
Besides strength or magnitude, what does every force have?
Direction
This force opposes motions.
What is friction?
Forces on an object that are equal in size and opposite in direction, cancelling each other out are called...
Balanced Forces
As motion increase, friction ____________
decreases
Earth's circular path around the sun is best describe as what pattern of motion?
Revolution
What are gravity, magnetic force, and electrical force.
Name 3 Contact Forces
applied, friction, spring, normal, buoyancy, tension
What force causes it to be more difficult to walk on ice than on a dry sidewalk?
Friction
True or False? An object in constant motion without friction AND an object at rest BOTH have balanced forces acting on them with a Net Force of 0!
TRUE
What forces would you label on a Force Diagram for a Book Sitting on a Table?
Normal Force and Gravity