Position Graphs
On a position-time graph, what does the slope of the line represent?
Velocity
What quantity is represented by the area of a velocity-time graph?
Displacement
How can acceleration be calculated?
Change in velocity over time
Which force always acts perpendicular to the surface?
Normal Force
If you apply the same net force to two objects, but one object has twice as much mass as the other, how will their accelerations compare?
The object with twice the mass will have half the acceleration
Describe the motion of an object whose position-time graph is a straight horizontal line
At rest/stationary/zero velocity
What does a horizontal line (not on the x axis) on a velocity graph indicate about an object's acceleration?
No acceleration, constant velocity
If an acceleration graph is a constant line at 0, what state(s) of motion could an object be in?
At rest or constant velocity
Name the two types of friction forces
Static and kinetic
If you double the net force acting on an object while keeping its mass constant, what happens to its acceleration?
The acceleration doubles.
How can you determine the velocity of an object at a specific time on a position graph?
Use the slope
2 m/s^2
If an object has an acceleration with an opposite sign to its velocity, what is happening?
Slowing down
A skydiver is falling, what would their force diagram look like?
Just gravity
Two identical cars apply their brakes with the exact same stopping force, but Car A is loaded with heavy luggage while Car B is empty. Which car takes longer to come to a complete stop, and why?
Car A; because it has more mass, it experiences less deceleration ($a = F/m$) for the same force
If a position-time graph forms a curve opening upwards (shallow to steep), what can you determine about the speed?
It is speeding up
How can you tell if an object is changing direction from a velocity time graph?
If it crosses the x-axis (positive to negative or negative to positive)
An object has an acceleration of 3 m/s^2. If starting from rest, what is it's velocity after 4 seconds?
12 m/s
What force corresponds to a pull motion?
Tension
An object is moving to the right, but the net force acting on it points to the left. Is the object speeding up, slowing down, or moving at a constant speed?
It is slowing down (acceleration is in the opposite direction of motion).
Determine the initial and final position. Subtract the initial from the final.
An object has a positive velocity and a negative slope on the velocity-time graph. Describe the speed and motion.
The object is slowing down (negative acceleration)
If an object has an acceleration, what are the two ways that it could be moving?
Slowing down in positive direction, or speeding up in negative direction
A block is being pulled upwards by a string. What forces would be present on the force diagram?
Gravity and tension
An elevator is moving upward while slowing down as it approaches its floor. Is the upward force from the elevator cable greater than, equal to, or less than the downward force of gravity on the elevator?
Less than gravity. (Since it is slowing down while moving upward, the acceleration points downward, meaning the net force must point downward.)