Physics (Meanings - Answers)

Question 1

Properties of Motion

Give 3 atleast

Answer 1

1) Displacement
2) Velocity
3) Acceleration

Question 2

• the distance and direction travelled from a reference point.

Give the answer for the meaning

Answer 2

Displacement

Question 3

Alex Rodriguez hits a home run. What is his total displacement around the bases?

Give the answer to the question

Answer 3

Ans: 0!!!

Question 4

Velocity:

Give the formula of Velocity

Answer 4

distance
———————
time

Question 5

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

Answer 5

==========420 ft - 0 ft=============
velocity = ————————– = 120 ft / s
===========3.5s - 0s===============

- For every second, the ball travels 120 ft.

Question 6

Average Acceleration:

Formula:

Answer 6

===================change-in-velocity===△v= ->
Average Acceleration: = ————————– = ——- = a
====================change-in-time====△t=

Question 7

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

Answer 7

=====85m/s - 0m/s ============
a = ————————– = 13.28m/s²
=======6.4s - 0s==============

*For every second, the velocity increases by
13.28

Question 8

Vector & Scalar Quantities
A vector quantity has (_)

Complete the meaning

Answer 8

has size and direction

Question 9

Vector & Scalar Quantities
A scalar quantity has (_)

Complete the meaning

Answer 9

only size and no direction

Question 10

vector quantity examples

Give examples:

Answer 10

Displacement, Velocity, Acceleration

Question 11

scalar quantity examples

Give examples:

Answer 11

Distance,Speed

Question 12

Galileo Galilei

Year when he was born and died

Answer 12

(1564 - 1662)

Question 13

Tower of Pisa year?

Answer 13

(1564 - 1642)

Question 14

What is then a Free Fall?

In a vacuum (no air) all objects in free fall, (_)

Complete the sentence

Answer 14

accelerate at the same rate, regardless of mass

Question 15

when gravity is the only force acting on an object (free fall acceleration is directed toward center of earth)

Answer to the meaning?

Answer 15

Free Fall

Question 16

The acceleration of gravity (g) for objects in free fall at the earth’s surface is (_).

Acceleration of gravity?

Answer 16

9.8 m/s²

Question 17

Galileo found that all things fall at the same rate in the (_)

Complete the sentence

Answer 17

absence of air resistance, regardless of their mass

Question 18

Free Fall – Object being dropped from rest

A. Initial velocity is (_)

B. Acceleration is g = (_)

Answer 18

A. zero

B. 9.80 m/s²

Question 19

Free Fall – Object thrown downward

A. Initial velocity is (_)

B. Acceleration is g = (_)

Answer 19

A. not zero

B. 9.80 m/s²

Question 20

Free Fall – Object thrown upward

A. The instantaneous velocity at the maximum height is (_).

B. A = g = (-) (_)

Answer 20

A. zero

B. 9.80 m/s²

Question 21

The rate of falling increases by 9.8 m/s every (_)

Complete the sentence

Answer 21

Second

Question 22

The rate of falling increases by 9.8 m/s every second.

Height = (_)

Give the formula of height

Answer 22

½ gt²

Question 23

Height = ½ gt²
For example:

Give four examples:

Answer 23

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

Question 24

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

Answer 24

less air resistance

Question 25

The force of friction or drag acting on an object in a direction opposing its motion as it moves through air

Answer to the meaning?

Answer 25

Air Resistance

Question 26

When sky divers jump, initially they (_)

Complete the sentence

Answer 26

accelerate rapidly

Question 27

Eventually, their combined weight due to
gravity will be (_) by their upward air
resistance.

Complete the sentence

Answer 27

balanced

Question 28

They will stop accelerating and fall at a constant
speed called their (_)

Complete the sentence

Answer 28

terminal velocity

Question 29

If they did this near the surface of the moon,
there would be no air resistance.
Their speed would keep increasing until they
crashed into the surface.

Extras

Answer 29

If they did this near the surface of the moon,
there would be no air resistance.
Their speed would keep increasing until they
crashed into the surface.

Press 5

Question 30

• A person in free fall reaches a terminal velocity of around 54 m/s which means the person stops accelerating b/c:
• Force of air resistance = gravitational force
• Called terminal velocity (balanced forces)
• With a parachute, terminal velocity is only 6.3 m/s
  Allows a safe landing

More information… just give the answer

Answer 30

Free fall

Question 31

In a Vacuum, all objects (_)

Answer 31

fall at the same speed

Question 32

If a heavy object and a light object are released at the same time, (_)

Complete the sentence

Answer 32

• Initially they may appear to fall at same speed

Question 33

When the light object reaches terminal velocity, (_)

Complete the sentence

Answer 33

the heavy object will still be accelerating