—

# **Science Worksheet (Set 8)**
**Topic: Motion and Speed**

## **Q1. Answer the following questions:**

### **a. A cyclist is traveling in a circular path with a speed of 20 km/h. Arrows show changing directions at different points on the path.**

#### **i. Is the speed of the cyclist a scalar or a vector? Why?**
**Answer:**
– Speed is a **scalar quantity** because it only considers the magnitude (20 km/h) without direction.
– Velocity, however, is a **vector quantity** because it includes both magnitude and direction.

—

#### **ii. Is the velocity constant or changing? Explain.**
**Answer:**
– The velocity is **changing** because the direction of motion is continuously changing in a circular path.
– Even though the speed remains constant, the change in direction results in a changing velocity.

—

### **b. A car is traveling at a constant speed of 60 km/h on a straight road. The driver maintains this speed for 2 hours.**

#### **i. What is the distance covered by the car in 2 hours?**
**Solution:**
\[
\text{Distance} = \text{Speed} \times \text{Time}
\]
\[
= 60 \text{ km/h} \times 2 \text{ h} = 120 \text{ km}
\]
**Answer:** *The car covers a distance of 120 km in 2 hours.*

—

#### **ii. Draw the distance-time graph for this motion. Also, tell which type of motion is shown by the car.**
**Answer:**
– The **distance-time graph** for this motion will be a **straight line with a constant slope**, representing **uniform motion**.
– Since the car is moving at a constant speed without acceleration or deceleration, it exhibits **uniform motion**.

—