Physics (Meanings - Answers) Flashcards
Properties of Motion
Give 3 atleast
1) Displacement
2) Velocity
3) Acceleration
- the distance and direction travelled from a reference point.
Give the answer for the meaning
Displacement
Alex Rodriguez hits a home run. What is his total displacement around the bases?
Give the answer to the question
Ans: 0!!!
Velocity:
Give the formula of Velocity
distance
———————
time
A Home-Run takes about 3.5 sec to clear Shea’s center wall (420 ft.) What is the velocity of the ball?
Solve for the Velocity of this question by using the formula
==========420 ft - 0 ft=============
velocity = ————————– = 120 ft / s
===========3.5s - 0s===============
- For every second, the ball travels 120 ft.
Average Acceleration:
Formula:
===================change-in-velocity===△v= ->
Average Acceleration: = ————————– = ——- = a
====================change-in-time====△t=
A car does 0-85 m/s in 6.4 seconds. What the average acceleration for this interval of time?
Solve for the Average Acceleration of this question by using the formula
=====85m/s - 0m/s ============
a = ————————– = 13.28m/s²
=======6.4s - 0s==============
*For every second, the velocity increases by
13.28
Vector & Scalar Quantities
A vector quantity has (_)
Complete the meaning
has size and direction
Vector & Scalar Quantities
A scalar quantity has (_)
Complete the meaning
only size and no direction
vector quantity examples
Give examples:
Displacement, Velocity, Acceleration
scalar quantity examples
Give examples:
Distance,Speed
Galileo Galilei
Year when he was born and died
(1564 - 1662)
Tower of Pisa year?
(1564 - 1642)
What is then a Free Fall?
In a vacuum (no air) all objects in free fall, (_)
Complete the sentence
accelerate at the same rate, regardless of mass
when gravity is the only force acting on an object (free fall acceleration is directed toward center of earth)
Answer to the meaning?
Free Fall
The acceleration of gravity (g) for objects in free fall at the earth’s surface is (_).
Acceleration of gravity?
9.8 m/s²
Galileo found that all things fall at the same rate in the (_)
Complete the sentence
absence of air resistance, regardless of their mass
Free Fall – Object being dropped from rest
A. Initial velocity is (_)
B. Acceleration is g = (_)
A. zero
B. 9.80 m/s²
Free Fall – Object thrown downward
A. Initial velocity is (_)
B. Acceleration is g = (_)
A. not zero
B. 9.80 m/s²
Free Fall – Object thrown upward
A. The instantaneous velocity at the maximum height is (_).
B. A = g = (-) (_)
A. zero
B. 9.80 m/s²
The rate of falling increases by 9.8 m/s every (_)
Complete the sentence
Second
The rate of falling increases by 9.8 m/s every second.
Height = (_)
Give the formula of height
½ gt²
Height = ½ gt²
For example:
Give four examples:
½ (9.8 )1² = 4.9 m
½ (9.8)2² = 19.6 m
½ (9.8)3² = 44.1 m
½ (9.8)4² = 78.4 m
On Earth, gravity is not the only force on an
object in free fall. The acorn falls faster than
the leaf because it has (_)
Complete the sentence
less air resistance
