Peter collects objects which perform a periodic motion as part of project work. He has already included a pendulum, the guitar, and a toy swing in his collection. Should he also include a wristwatch? Give reasons

Samuel decides to find the average speed of his parent’s car while they take a drive to a park 21 km away from their home. Which of the following would yield him the most accurate result?
a. Look for milestones throughout the journey and note down the distance traveled against the respective time stamps. Later use the formula, average speed = total distance traveled / total time taken to calculate the average speed.
b. Keep an eye on the odometer and note down the distance traveled by car against the respective time stamps. Later use the formula, average speed = total distance traveled / total time taken to calculate the average speed.
c. Keep an eye on the speedometer and note down the speed at different locations. Later use the formula average speed = sum of all the speeds/ no. of observations to calculate the average

Observe the picture below. Can we consider the position of the child as a reference point to study the state of a person sitting inside the car? Give reasons

Which of the following is true about the distance traveled by a moving object?
a. It always increases with time
b. It can be zero
c. Generally, it is greater than the displacement
d. It can also be equal to the displacement at times

In which of the following cases is the displacement equal to the distance traveled by the body?

Observe the picture below. What is the state of a passenger in the yellow bus w.r.t. the traffic pole and w.r.t. another passenger in the same bus?

Observe the picture below. The position of which of the objects can be considered as a reference point to study the state of a passenger in the yellow bus?

a. The child
b. The car
c. The traffic pole
d. Another passenger in the same bus
e . A person travelling in the car
f. One of the yellow strips on the road

A bus crosses a bus stop without stopping. What is the state of motion of the driver w.r.t. a child standing at the bus stop?

Which of the following is true for a body undergoing a non-uniform motion?
a. It covers unequal distances in equal intervals of time.
b. It covers equal distances in unequal intervals of time.
c. It travels in the same direction with the same speed throughout the motion
d. Its rate of motion is measured by a physical quantity called average speed.

Pick the odd one out

The rate of change of displacement is called ___. Its SI unit is ___.

What kind of motion do the blades of a fan (switched on) make?
a) Rotational motion
b) Periodic motion
c) Random motion
d) Oscillatory motion

Speed + direction = ___.

Sheena wanted to measure the displacement between two points of her house. She has fixed an iron nail at each point. Which of the following methods can she follow?
a. Tie a thread to the first nail and then tie it to the other nail. Measure the length of the thread between those two points using a ruler.
b. Tie a thread to the first nail and tie the other end of the thread to the second nail so that the thread is taut and measure the length of the thread used using a ruler.
c. Fix one end of the measuring tape to the first nail and stretch it towards the second nail and record the measurement.

If the line between two points is straight, then only it will show displacement.

A boy is running along a circular path of radius R. He completes one revolution in 50 s. What is the displacement of the boy after 2 minutes 55 seconds?

An object covers the first 30 m of the journey in 5 seconds and the next 30 m in 3 seconds. What is the average speed of the object?