Forces
What is net force?
Sum of all forces acting on an object
What is the difference between speed and velocity?
What is acceleration measured in?
m/s2, distance/ time2
When an object is in free fall what is the only force acting on it?
Gravity
What is the net force that has a force of 5N pulling to the right and force of 5N pulling to the left?
Net force= 0N
Can your instantaneous speed ever be higher than your average speed?
Yes!
Describe the acceleration of the velocity vs time graph from 2-4 hours
The vehicle is accelerating (speeding up)
What an object is in free fall what is the acceleration due to gravity?
10 m/s2
Newton's first law states an object in motion will stay in motion and object at rest will remain at rest unless acted on by an outside force. What is another name for his first law?
Law of interia
Describe the speed using the distance vs time graph from D to E
no distance traveled, at rest, speed=0m/s
If the speed of an object is constant, what is its acceleration?
0m/s2
When an object is thrown upward, vertically, what speed does it reach at its highest point.
speed of 0m/s
What does it mean if an object is balanced?
Net force = 0N, object is at rest
constant speed in opposite direction
Describe the velocity of the velcoity vs time graph from 8-12 hours
deccelerating, slowing down
When an object is thrown upward, vertically, describe what is happening to its speed.
It is slowing down (deaccelerating), 10m/s per each second
What is a support force?
A force a surface provides on an object that is equal in value but opposite in direction
You are practicing your mile times. In your first practice you complete a mile in 6 minutes. During your second practice, you travel the same distance but it takes you 30 seconds longer. Did you increase or decrease your speed?
speed = distance/time
decrease
acceleration = change in velocity / time
Decrease
What happens to the vertical distance of an object as the time it falls for, increases?
The distance increases