Newton's 2nd
Graphs
Velocity
Newton's 1st
Acceleration
100
What is Newton's 2nd Law (using math)?
acceleration = ΣForce / mass
100
When we graph motion, what physical quantity goes on the horizontal axis?
Time
100
What is the equation for velocity?
velocity = (xf - xi) / (tf - ti)
100
What is the first part of Newton's 1st Law?
An object at rest will stay at rest unless acted on by an outside net force.
100
What are the two ways we can find acceleration?
acceleration = change in velocity / change in time
acceleration = Force / mass
200
If a ball of 3 kg and a ball of 5 kg are accelerating at the same rate, which one do we have to apply more force to?
The 5 kg ball
200
For a Position vs Time graph, if an object is not moving what will the graph look like?
200
What is velocity?
Speed in a direction
200
What must the Fnet be for an object to remain at rest?
Fnet = 0 N
200
If you are accelerating, what is happening to your velocity?
Your speed or direction are changing.
300
Is force directly proportional or inversely proportional to acceleration?
Directly Proportional
300
For a position versus time graph, what does the slope of the line represent?
Velocity
300
If a car travels 20 miles North in 30 minutes, what is it's velocity?
20 miles / 30 minutes = 0.67 miles / minute North
OR
20 miles / 0.5 hours = 40 miles / hour North
300
What is the second part of Newton's 1st Law?
An object in constant motion will remain in constant motion unless acted on by an outside net force.
300
You throw a 2 kg ball with 10 N of force. What is the acceleration of the ball?
10 N / 2 kg = 5 m/s / s OR 5 m/s2
400
Is mass directly proportional or inversely proportional to acceleration?
Inversely Proportional
400
Name 3 things you must always include on a graph.
Title, axis labels/units, evenly spaced scale, or data
400
How do you represent velocity in a motion diagram?
With velocity arrows, in between the dots.
400
What word describes the motion of an object where the net force is zero?
Inertia
400
If you are moving in the positive direction and speeding up, is your acceleration positive or negative?
Acceleration is positive.
500
A model rocket with a mass of 0.05 kg pushes up with a force of 5 N. If earth is pulling down with 0.4 N, what is the rocket's acceleration?
ΣF = 5 N - 0.4 N = 4.6 N
a = 4.6 N / 0.05 kg = 92 N
500
For a Position vs Time graph with 2 sets of data plotted on it, what does it mean if the lines intersect?
It means they were in the same place at the same time. They crashed!
500
A bowling ball is rolled down a lane which is 60 feet long. If it takes 2.4 seconds to roll the length of the lane, what is it's velocity? (Assume that towards the pins is negative)
60 feet / 2.4 seconds = - 25 feet / second (towards the pins)
500
Draw a force diagram of a grocery cart being pushed, but traveling at a constant speed.
500
A train arrives at a station. It was traveling at 80 m/s and took 40 seconds to stop. What was it's acceleration?
0 m/s -80 m/s / 40 seconds -0 seconds = - 2 m/s /s
OR - 2 m/s2