Phy - Motion in time

Question 1

The moment in which things occur is called what ?

Answer 1

It is called time

Question 2

What are the four types of motion’s ?

Answer 2

1. Rectilinear motion
2. Circular motion
3. Rotational motion
4. Periodic motion

Question 3

What is Rectilinear motion ?

Answer 3

Rectilinear motion is motion in a straight line

Question 4

What is Circular motion ?

Answer 4

Circular motion is motion that moves in a circular path

Question 5

What is Rotational motion ?

Answer 5

Rotational motion is motion that spins on axis ( on a fixed point )

Question 6

What is periodic motion ?

Answer 6

periodic motion is motion which repeats itself after regular intervals of time

Question 7

What does unit of speed depend on ?

Answer 7

It depends on the unit of distance and unit of time used

Question 8

What are the different units of speed ? (3)

Answer 8

1. Meters per second
2. meters per minute
3. kilometers per hour

Question 9

What is the instrument on the dash board ?

Answer 9

It is called speedometer

Question 10

What is odometer ?

Answer 10

It measures the distance traveled by a car

Question 11

What is uniform motion ?

Answer 11

it is when the speed is the same all along

Question 12

What are some ancient time measuring devices ? (3)

Answer 12

1. Sundial
2. Sand clock
3. Water clock

Question 13

The time-period of a given pendulum is constant was discovered by which scientist ?

Answer 13

Galileo Galilie

Question 14

Name three units of time used in everyday life

Answer 14

1. Seconds
2. minutes
3. hours

Question 15

Name two natural units of time used in the olden day

Answer 15

1. Sundial

2. water clock

Question 16

What is the formula for speed ?

Answer 16

Formula -

speed =

         (distance time travelled) 
           ----------------------------------
                    ( time taken )

Question 17

Salam takes 15 min from her house to reach her school on a bicycle. If the cycle has a speed of 2 m/s, calculate the distance between her house and the school

Answer 17

Solution :-

In this problem the speed is given in m/s and the time is given in minutes . So before putting the formula for speed we will have to convert time from minutes into seconds.

Question 18

A car moves with a speed of 40km/h for 15 min and then was a speed of 60 km
for the next 15 min What is the total distance covered by the car ?

Answer 18

Solution :-

In the first case the speed of the car is 40 km/h and in the second case the speed of car is 60km/h but the time is the same in booth cases. now science the speed is in km per hour we should first convert the time into hours by dividing the time by 60

Question 19

The odometer of a car reads 57321.0 when the clock shows 8.30 AM . What is the distance moved by the car if at 8.50 AM , the odometer readings has changed to 57336.0 km ?

Answer 19

Solution :-