Motion in Physics: Straight Line Motion

Questions and Answers

What defines regular (uniform) speed in motion?

Covering equal distances in variable intervals of time

Covering variable distances in equal intervals of time

Covering equal distances in equal intervals of time (correct)

Covering unequal distances in unequal intervals of time

Which situation describes irregular (non-uniform) speed?

A train moving at a fixed speed between stations

A bicycle traveling downhill at a steady pace

A car moving at a constant speed on a highway

A person running the same distance at varying speeds (correct)

If a car moves at a regular speed of 70 Km/h, how far will it travel in half an hour?

140 km

70 km

35 km (correct)

15 km

What is the speed of the body if it covers 10 meters in 5 seconds?

2 m/sec Signup and view all the answers

What is the calculated distance (X) covered by a body moving at 2 m/sec in 15 seconds?

30 m Signup and view all the answers

How long (Y) does it take for a body to travel 50 meters at a speed of 2 m/sec?

25 sec Signup and view all the answers

In which situation does a moving object exhibit non-uniform speed?

A car steadily increasing speed while accelerating Signup and view all the answers

If a body covers 20 m in the first second, 20 m in the second second, and 20 m in the third second, which speed is depicted?

Regular speed Signup and view all the answers

What is the relationship between speed (V), distance (d), and time (t)?

Speed is directly proportional to distance when time is fixed. Signup and view all the answers

How many meters are there in 1 kilometer?

1000 meters Signup and view all the answers

If a sprinter runs at a speed of 6 m/sec for 10 seconds, how far does he run?

60 meters Signup and view all the answers

What is the speed in m/sec of a train that covers 50 meters in 2 seconds?

25 m/sec Signup and view all the answers

Convert a speed of 850 km/h to m/sec.

236.1 m/sec Signup and view all the answers

If a train covers a distance of 200 km at a speed of 40 km/h, what is the travel time?

5 hours Signup and view all the answers

Which unit is NOT commonly used to measure speed?

liters per second Signup and view all the answers

What is the resultant speed of a car moving at 20 m/sec converted to km/h?

72 km/h Signup and view all the answers

What is the average speed of the racer's entire trip?

2.2 m/s Signup and view all the answers

During which segment did the sprinter have the highest average speed?

First 100 meters Signup and view all the answers

If the real speed of an object is 100 km/h and the observer's speed is 50 km/h, what is the relative speed?

50 km/h less than the object's speed Signup and view all the answers

Under what condition does an object move with regular motion?

When its constant speed equals its average speed Signup and view all the answers

What happens to the relative speed when both the observer and the object move in the same direction at the same speed?

It becomes zero Signup and view all the answers

What is the average speed of the runner during the last 300 meters?

7.5 m/s Signup and view all the answers

How is relative speed typically affected when two objects are moving in opposite directions?

It is the sum of the speeds of both objects Signup and view all the answers

What can be concluded if an object's average speed is greater than its constant speed?

The motion is irregular Signup and view all the answers

What is the speed of light in km/sec?

3 x 10^8 km/sec Signup and view all the answers

How long does it take for sunlight to reach Earth?

8 minutes and 17 seconds Signup and view all the answers

What formula is used to determine the time needed for sunlight to reach Earth?

Time = Distance / Speed Signup and view all the answers

What is the average speed of a car traveling 100 km in 1 hour?

100 km/h Signup and view all the answers

During a trip where speed is varied, how is average speed calculated?

Total distance covered divided by total time taken Signup and view all the answers

If a racer runs 100 meters in 10 seconds, what is their speed while running?

10 m/s Signup and view all the answers

How long did the racer take to return to the starting point walking?

80 seconds Signup and view all the answers

What best describes average speed?

Regular speed covering the same distance over the same period Signup and view all the answers

What defines the speed of a moving object?

The distance covered and the time taken Signup and view all the answers

If two cars cover the same distance but one does it in less time, which is true?

The faster car has a higher speed Signup and view all the answers

Which formula correctly expresses the relationship between speed, distance, and time?

V = d/t Signup and view all the answers

If two bikers take the same time to ride but one covers more distance, what can be inferred?

The biker covering more distance is faster Signup and view all the answers

How does decreasing the time taken to cover a fixed distance affect speed?

It increases speed Signup and view all the answers

In the scenario where a train and metro are both moving straight, which of the following is true?

They may move along a curved path Signup and view all the answers

What is the result if an object covers a greater distance while keeping the time constant?

The speed increases Signup and view all the answers

Which statement about two cars moving on the same path is correct?

The first car is faster if it covers the distance in less time Signup and view all the answers

Study Notes

Motion and Speed

Motion is the change in an object's position relative to a fixed object over time.
Linear motion includes straight-line travel, such as trains and metros, which only move forward or backward but not up or down.
Speed can be interpreted as the distance covered in a specific time period: Speed = Distance/Time.
The first car that covered 10 km in 2 minutes is faster than the second car that took 5 minutes for the same distance.

Key Concepts of Speed

Speed is based on two primary factors: distance covered and time taken.
An object moving the least amount of time has the highest speed, while longer distances covered in the same time indicate higher speeds.
Regular (uniform) speed is when equal distances are covered in equal intervals of time, while non-uniform speed occurs with variable distances over fixed time intervals.

Units of Measurement

Speed is measured in km/h or m/s.
Conversion between km/h and m/s can be calculated using the factor 5/18.
Example: A speed of 20 m/s equals 72 km/h, while 90 km/h is equivalent to 25 m/s.

Calculating Speed and Distance

Distance can be calculated as: Distance = Speed × Time.
- Example: A sprinter running at 6 m/s for 10 seconds covers 60 meters.
Speed = Distance/Time can be applied to various scenarios, such as calculating speed from given distances and times.

Average Speed

Average speed is the total distance covered divided by the total time taken.
For example, traveling 100 km in 1 hour results in an average speed of 100 km/h.

Race Examples

A racer taking 10 seconds for 100 meters averages 10 m/s running but only 1.25 m/s when returning, resulting in an overall average speed of 2.2 m/s for the round trip.

Relative Speed

Relative speed is the speed of an object as perceived by an observer, which changes depending on the observer's speed and direction.
If both the observer and the object are moving in the same direction, the relative speed is the difference between their speeds.

Electromagnetic Wave Speed

Light travels at a constant speed of 3 × 10^8 m/s.
Time for sunlight to reach Earth is approximately 8 minutes and 17 seconds, covering a distance of 149 million km.

Regular and Irregular Motion

An object has a regular motion when its speed is constant, meaning the constant speed equals the average speed (V = V).
Irregular motion occurs when the constant speed differs from average speed (V ≠ V).

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Description

Explore the concept of motion in physics, focusing on how an object's position changes over time in relation to a fixed point. This quiz discusses various types of straight line motion, with examples from trains and metros, illustrating forward and backward movement as well as curved paths.