# Forces and Motion

### 25 terms by demotedangel

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These are a set of card I use to study for my science final.

### Acceleration

an increase in speed

### Air resistance

the fluid friction experienced by objects falling through the air

### Average Speed

Total distance divided by total time

### Balanced Forces

equal forces acting on an object in opposite directions

### Displacement

the change in position of an object

### Force

force into or from an action or state.

### Friction

the resistance encountered when one object is moved in contact with another

### Instantaneous Speed

the speed of an object at one instant of time

### Net Force

the combination of all forces acting on an object

### Sliding Friction

friction that occurs when one surface slides over another

### Speed

distance travelled per unit time

### Static Friction

the friction that acts on objects that are not moving

### Unbalanced Forces

Forces that produce a nonzero net force, which changes an object's motion

### Vector

a variable quantity that can be resolved into components

### Velocity

speed in a given direction

### Centripetal Acceleration

acceleration toward the center of a curved or circular path

### Centripetal Force

the inward force on a body moving in a curved path around another body

### First Law of Motion

An object in motion will stay in motion unless it is acted upon by an outside force.

### Gravity

The force of attraction between all masses in the universe.

### Inertia

the tendency of an object to resist any change in its motion

### Law of Conservation of Momentum

the rule that the total momentum of objects in an interaction does not change

### Momentum

an impelling force or strength

### Second Law of Motion

the rate of change of momentum is proportional to the imposed force and goes in the direction of the force

### Third Law of Motion

action and reaction.

### Weight

a system of units used to express how heavy something is.

Example: