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# Forces&Motion

### DDMS 7th grade - Review for Forces & Motion Test

The state in which one object’s distance from another object is changing Motion
A place or point used for comparison to determine if an object is in motion Reference Point
The distance that an object travels per unit of time Speed
What is the formula (equation) used to find speed S = D/T; Speed = Distance/Time
Tell a metric unit for speed Km/hr; m/s
Speed in a given direction Velocity
On a graph that shows Distance V/S Time, what does the slope of the line represent? The Speed
On a graph that shows Distance V/S Time, what does a steep slope mean? The speed is fast
On a graph that shows Distance V/S Time, what does a gradual slope mean? The speed is slow
On a graph that shows Distance V/S Time, what does a horizontal line mean? Slope = 0, so the object is not moving.
The rate at which the velocity of an object changes Acceleration
What are the three things that can cause acceleration? Increase in speed, Decrease in speed, or Change in direction
What is the metric unit for acceleration? (m/s)/s or m/s^2
What does it mean if an object has a positive acceleration? It is speeding up
What does it mean if an object has a negative acceleration? It is slowing down
What does it mean if an object has no acceleration (A = 0)? It is moving at a constant speed
An object in motion will stay in motion, and an object at rest will stay at rest, unless acted on by an unbalanced force Newton's First Law of Motion
F = MA Newton's Second Law of Motion
Every Action has an equal and opposite reaction Newton's Third Law of Motion
How do balanced forces affect the motion of an object? Balanced forces cause an object to move at a constant velocity
How do unbalanced forces affect the motion of an object? Unbalanced forces cause an object to move with positive or negative acceleration
A push or pull on an object Force
The force of attraction between 2 masses Gravity
The force that opposes motion between 2 surfaces that are touching. Friction
How is the force of gravity (weight) affected when the mass of an object changes more mass = more weight; less mass = less weight
An equal but opposite force exerted by an object when a force acts on it Reaction
A boat is traveling 20km/hr toward the east. What property of the boat is being described? Velocity (Speed & direction)
If at train takes 6 hours to travel 240 miles, what is the average speed of the train? Speed = 40 km/hr
How do balanced forces affect the motion of an object? Balanced forces cause the object to move with a constant velocity
You apply 60N of force to move a refrigerator. If the force of friction is 45N, what is the net force acting on the refrigerator? 60N - 45N = 15N
How does friction affect a moving object? Friction slows down a moving object by decreasing the net force
Created by: jfakins