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# forces study guide

### science forces test 4 / 18 / 18

TermDefinition
Explain how balanced and unbalanced forces are related to motion Unbalanced forces cause an object to start or stop moving, or change direction. They also cause acceleration. Balanced forces are equal forces acting on one object in opposite directions. They DO NOT change the current state of motion.
Identify the net force acting on an object Net force is the overall sum acting on an object. If forces are in the same direction you add, but if they're in different directions you subtract.
What is the unit used to measure force. Newtons (N)
Force is the _______ or _____ upon an object resulting from the object's interaction with another object. push or pull
Forces have both size and _________. direction
Net force is the _________ ______ acting on an object. overall sum
Balanced forces are ________ forces acting on one object in opposite directions. equal
Unbalanced forces cause an object to ___ or _____ moving, or change ___________. start, stop, direction
State Newtonâ€™s First Law of Motion. An object at rest stays at rest and an object in motion stays in motion (with the same speed and direction) unless acted upon by an unbalanced force.
What is inertia? This is the resistance an object had to a change in its state of motion.
Inertia is _______ ________ of matter. physical property
Explain inertia in the following events: Explain inertia in the following events:
Our coin drop lab (a card is placed on a cup with a coin on the top of it. you have to figure out a way to get the coin to land in the cup). In general, the coin has inertia. It wants to stay in place. If you flick the coin quickly, it stays in one place and then drops in the cup.
A car that suddenly stops A moving car has inertia along with the riders inside of it. Both are moving forward, and want to stay in motion. Inertia is the reason we wear a seat belt. When the car suddenly stops, the driver jolts forward which shows there's inertia.
2 bumper cars This is the same with regular cars. But when there's a collision, the car suddenly stops. The person also jolts forward while the car is coming to a rest.
Created by: giannanagy_