The World of Physics
What is the definition of Position?
The location from a fixed reference point.
If a velocity vs. time graph is linear then acceleration is...
constant.
What is the definition of Distance?
Is how far an object have moved regardless of frame of reference.
what is a free fall?
motion of an object when gravity is the only force acting.
What is the definition of Displacement?
Is the change in position relative to fixed reference point.
If a displacement vs. time graph is linear then velocity is...
constant.
what word means the rate of change of velocity?
Acceleration.
The____ of any point on a position-time graph equals the instantaneous velocity at that time.
A.y-value B. coordinates C. x-value D.Slope of tangent
D.Slope of the tangent
What word means the rate of change of position?
Velocity.
If a displacement vs. time graph is a quadratic then the object is....
accelerating.
What type of formula is this v = ΔP/Δt?
Velocity
A car traveling initially at +7.0 m/s accelerates at the rate of +0.8 m/s² for 13 seconds what is its velocity at the end of acceleration?
Vf= 17.4 m/s
If I run 3 complete laps around the track, how far have I gone? Is this a good or bad question? and why?
A bad question, because we don't know if they want the distance or displacement.
what is g stands for and what it equals to?
g--> acceleration due to gravity or gravitational field strength.
What is the fourth formula for object traveling with a constant acceleration?
vf²= vi² + 2ad
A race car starting from rest accelerates at a rate of 5.00 m/s². What is the velocity of the car after it travels 100m?
Vf= 31.62m/s
What is the first formula for object traveling with a constant acceleration?
D= (vi+vf/2)t
Pi= 2m
Pf= 7m
t= 2.5 sec
What is the answer? (use the velocity formula)
2m/s
pf-pi/t --> 7-2/2.5 --> 2m/s
What is the second formula for object traveling with a constant acceleration?
Vf= at + vi
what are the 4 ways to solve quadratics?
1. graph
2. factor
3. Quadratic formula
4. Completing the square
What is the third formula for object traveling with a constant acceleration?
d= 1/2(a)(t)²+ vi(t)
What are the 5 steps Physics Problem Solving system?
1. Draw a picture or diagram
2. List all variables that may be use in the problem
3. Identify the correct formula to use in the problem
4. Substitute values into the formula
5. Solve equation and check it make sense with the units.
A rock is thrown straight up with an initial velocity of 19.6 m/s. What time interval elapse between the rock's being thrown and its return to the original launch point? (gravity is -9.81 m/s²)
a) 4.0s b) 5.0s c) 8.0s D) 10.s
a) 4.0s
A ball thrown vertically upward with a velocity of 6.2 m/s. a) how high does the ball go? b) how long is it in the air?
a) d=1.96
b) t= 1.26
What are all 4 formulas for object traveling with a constant acceleration
1. D= (vi+vf/2)t
2. Vf= at + vi
3. d= 1/2(a)(t)²+ vi(t)
4. vf²= vi² + 2ad