Gravity
2D Kinematics
Newtons Laws
Interpreting Graphs
Making FBDs
100
What are the units for acceleration due to gravity.
The units (just like any acceleration) are:
m/s^2
100
What two things does a vector have (think despicable me)?
Magnitude and Direction
100
An object at rest stays at rest, and an object in motion stays in motion unless acted on by this...
A net external force
100
The slope of a position–time graph represents what quantity?
Velocity
100
Forces are drawn as what, starting from the object?
Vectors
200
What is the magnitude for the acceleration due to gravity (include units)?
The magnitude (Magnitudes are always positive) is:
9.81 m/s^2
200
What is the horizontal acceleration of a projectile (neglecting air resistance)?
0\frac{m}{s^2}
200
What are the SI units for force?
Newtons [N]
200
The area under a velocity–time graph represents what?
Displacement
200
A book is resting on a table. Draw a FBD for it and label the forces.
hooray!
300
Why does your weight decrease on the moon?
Gravity is lower than on Earth
300
What is the vertical velocity and acceleration when a projectile reaches the top of its trajectory?
v_y=0\frac{m}{s}
a_y=-9.81\frac{m}{s^2}
300
If net force doubles and mass stays the same, what happens to acceleration?
Acceleration doubles
300
A curved (concave up) position–time graph indicates what about the acceleration?
Positive Acceleration
300
An object is sliding down a rough incline. Draw a FBD that shows ALL of the forces in regards to the object.
hooray!!
400
At twice Earth’s radius from the center, what fraction of it's surface value does g become?
One-fourth
400
What is the equation for finding a vector with the components vx and vy?
\sqrt{v_x^2+v_y^2}
400
Which force is larger: Earth pulling on you, or you pulling on Earth?
They are equal in magnitude
400
If acceleration has a sign opposite of velocity, what is happening to the to the motion of the object?
It is slowing down
400
Two books are stacked, and the stack is being pushed to the right on a rough surface. Draw a FBD including all forces for the BOTTOM book.
hooray!!!
500
A kangaroo jumps straight up to a vertical height of 1.45m. How long was it in the air before landing
t_{airtime}=1.09s
500
A ball is thrown horizontally from the roof of a building 7.5m tall and lands 9.5m from the base. What is the ball's initial speed?
\abs\vec{v}=7.7m/s
500
a 20.0kg box is being push up a ramp that makes an angle Theta=32^\{circ} with the horizontal. If the speed of the box is a constant value: |\vec{v}|=2.00 m/s, What is the magnitude of the force \vec{F_A} acting acting on the box? (\mu_k = 0.5)
|\vec{F_A}|=187N
500
Consider the following velocity vs. time graph. Make the associated acceleration vs. time graph for this plot
Use the Slope!
500
For a person standing in an elevator, draw the free body diagrams for the person when the elevator is:
a. standing still.
b. moving upward at constant velocity.
c. accelerating upward.
d. moving downward at constant velocity.
e. accelerating downward.
Horary