#### Chapters

Chapter 2 - Nutrition in Animals

Chapter 3 - Fibre to Fabric

Chapter 4 - Heat

Chapter 5 - Acids, Bases and Salts

Chapter 6 - Physical and Chemical Changes

Chapter 7 - Weather, Climate and Adaptations of Animals to Climate

Chapter 8 - Wind Storms and Cyclones

Chapter 9 - Soil

Chapter 10 - Respiration in Organisms

Chapter 11 - Transportation in Animals and Plants

Chapter 12 - Reproduction in Plants

Chapter 13 - Motion and Time

Chapter 14 - Electric Current and Its Effects

Chapter 15 - Light

Chapter 16 - Water: A Precious Resource

Chapter 17 - Forests: Our Lifeline

Chapter 18 - Wastewater Story

## Chapter 13 - Motion and Time

#### Pages 156 - 1567

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of your hands while running.

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of a horse pulling a cart on a straight road.

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of a child in a merry-go-round.

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of a child on a see-saw.

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of the hammer of an electric bell.

Classify the given motion along a straight line, circular or oscillatory motion:

Motion of a train on a straight bridge.

Which of the following are not correct?

(1) The basic unit of time is second.

(2) Every object moves with a constant speed.

(3) Distances between two cities are measured in kilometres.

(4) The time period of a given pendulum is not constant.

(5) The speed of a train is expressed in m/h.

A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.

The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

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

Show the shape of the distance-time graph for the motion in the following cases:

A car moving with a constant speed.

Show the shape of the distance-time graph for the motion in the following cases:

A car parked on a side road.

Which of the following relations is correct?

1) Speed = Distance × Time

2) Speed = `"Distance"/"Time"`

3) Speed = `"Time"/"Distance"`

4) Speed = `1/"Distnace x Time"`

The basic unit of speed is:

1) km/min

2) m/min

3) km/h

4) m/s

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

(1) 100 km

(2) 25 km

(3) 15 km

(4) 10 km

Suppose the two photographs, shown in Figure 1 and Figure 2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.

**Figure 1 Vehicles moving in the same direction of ****on a road**

**Figure 2 Position of vehicles shown in Figure 1 after some time**

Figure shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?

**Figure: Distance-time graph for the motion of two cars**

Which of the following distance-time graphs shows a truck moving with speed which is not constant?

(1)

(2)

(3)

(4)