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# MM Sci 8 force/motio

### force and motion science 8

The state in which one object's distance from another is changing- motion
A place or object used for comparison to determine if an object is in motion Reference Point
Rate of change in position, the distance an object moves per unit of time speed
A speed that does not vary Constant Speed
The speed of an object at one instant of time like a car speedometer or a radar gun Instantaneous Speed
How do you find average speed? average speed (v) = distance (d) divided by time (t)
The steepness of the line of a graph Slope
Describes both speed and direction of an object. The velocity of an object can change even if the speed of the object remain constant. velocity
The rate of change in velocity acceleration
When acceleration and velocity are in the same direction →→ Positive acceleration
When acceleration and velocity are in opposite directions → ← Negative acceleration
What is the Acceleration formula? Acceleration (a) = (final velocity - initial velocity) divided by time a = (vf -vi) / t
A ____ ______ on an object always changes the velocity net force
How is force measured? Newtons
Name 6 examples of force. pushing, pulling, stretching, squeezing, bending, falling
Net force determines whether an object ____ and in what ____. moves, direction
When the forces are equal in opposite directions what type of force is it? balanced
What does unbalanced forces do to an object's motion? changes it
What is the force that pulls objects towards each other? gravity
What 2 forces affect gravitational attraction? mass and distance
What 2 forces affect gravitational attraction? mass and distance
What number is the acceleration due to gravity? 9.8 m/s squared
What is the force air exerts on a moving body air resistance or fluid friction
What is the term for when the force of air resistance equals the weight of the object? terminal velocity
What is the term for anything that is thrown or shot through the air? projectile
A thrown object will follow a curved path because its own ____ sends it forward as gravity pulls it down. inertia
What is the tendency of an object to resist any change in motion? inertia
On what does inertia depend? mass
Newton's Law of motion stating that any object moving at a constant velocity keeps moving unless a net force acts on it. If an object is at rest, it stays at rest unless a net force acts on it. 1st
Example of which of Newton's Laws of motion? When your seat belt keeps you from flying through the windshield at a sudden stop 1st
Which of Newton's Laws of motion states that an object exerts a force on a second object, the second one exerts a force on the first that is equal in size and opposite in direction? 3rd
To every ____ force there is an equal and opposite ____. action, reaction
Which of Newton's Laws of Motion states that a net force action on an object causes the object to accelerate in the direction of the force. This acceleration is determined by the size of the force and the mass of the object? 2nd
These 3 examples illustrate which of Newton's Laws of Motion? A cannon fires, the space shuttle takes off, or you push off the wall while roller skating 3rd
What is it called when the total momentum of any group of objects remains the same, or is conserved unless outside forces act on the objects? Law of Conservation of Momentum
What does centripetal mean? towards the center
What keeps natural and artificial satellites in orbit? Centripetal force
What is the formula for Newton's 2nd law of Motion to find force? Force (f) = Mass (m) x Acceleration (a)
What is quantity of motion? momentum