Chapter 5 Flashcards
a force that always acts to oppose motion
Friction
a push or pull that always acts on an object
Force
a change in a moving object’s speed or direction; something is accelerating if it is speeding up, slowing down or changing direction.
Acceleration
speed of an object in a particular direction, an objects velocity changes if either its speed or direction changes.
Velocity
the force of attraction between objects; it is affected by mass and distance
Gravity
the measure of gravitational force exerted on an object
Weight
a measure that does not change when an object’s location changes, it is a measure of the amount of matter in an object.
Mass
a unit of mass
kilogram
SI unit for force
Newton
object that appears to stay in place and is used to detect if an object is in motion.
Reference point
Calculating net force in same direction:
Add
Calculating net force in opposite directions:
Subtract and take the direction of the larger force.
Average Speed=
(speed does not have direction)
Total distance/(divided by) Total time
How do you calculate the moon’s weight?
1/6 of Earth’s gravity
Meaning
120/6= 20
An unbalanced force produces…
A change in motion
a unbalanced force can cause a change in…
direction, speed, start or stop.
Gravitational force is affected by what two factors?
Mass & Distance (bigger mass more gravitational pull & the closer the object the greater the gravitational pull)
What is the difference between rolling friction and helpful friction
Rolling Friction- takes place when an object rolls on the surface
Helpful Friction- Is basically friction that helps us (brakes on a car)
Acceleration =
Final velocity – Starting Velocity (divided by)
Time it takes to change velocity
