Science Do as directed; [1 M ]

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated? This photograph shows a man-made 'communication satellite' going round the earth in a circular orbit (or circular path). We can see the dish antennae and solar panels (made of solar cells) clearly in this photograph. This photograph shows a watch. The tip of seconds 'hand of this watch moves rapidly on the dial of the watch. The tips of minutes' hand and hours' also move on the dial but they move slowly.

Write the formula for acceleration. Give the meaning of each symbol which occurs in it.

State which of the following situations are possible and give an example for each of these: an object moving with an acceleration but with uniform speed.

State whether displacement is a scalar or a vector quantity.

State whether distance is a scalar or a vector quantity.

State which of the following situations are possible and give an example for each of these: an object moving in a certain direction with an acceleration in the perpendicular direction.

Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

Which of the two can be zero under certain conditions average speed of a moving body or average velocity of a moving body?

What type of motion is represented by the tip of the ‘seconds’ hand’ of a watch? Is it uniform or accelerated?

Name the physical quantity which gives us an idea of how slow or fast a body is moving.

What changes continuously in uniform circular motion?

A body goes round the sun with constant speed in a circular orbit. Is the motion uniform or accelerated?

What remains constant in uniform circular motion?

If the acceleration of the particle is constant in magnitude but not in direction, then what type of path does the particle follow?

Name the quantitity, the slope of whose graph gives: Speed.

What does the path of an object look like when it is in uniform motion?

Write the SI unit of the both distance and displacement.

Is displacement a scalar quantity?

The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero? Give reason for your answer.

What can you say about the motion of a body if its speed-time graph is a straight line parallel to the time axis?

State whether speed is a scalar or a vector quantity. Give reason for your choice.

What does the odometer of an automobile measure?

Give one word which means the same as ‘moving with a negative acceleration’.

Which of the following is true for displacement?

1. It cannot be zero.
2. Its magnitude is greater than the distance travelled by the object.

What is the quantity which is measured by the area occupied below the velocity -time graph?

What is the other name of negative acceleration?

Give two examples of bodies having non-uniform motion.

Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.

What does the slope of a distance-time graph indicate?

What name is given to the speed in a specified direction?

An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Does the motion of second’s hand of a watch represent uniform velocity or uniform speed?

Define average speed.

Give SI unit of angular velocity.

State which of the following situations are possible and give an example for each of these:
an object with a constant acceleration but with zero velocity.

What is the displacement of a satellite when it makes a complete round along its circular path?

Under which condition is the magnitude of average velocity equal to average speed?

What is the SI unit of retardation?

What does the slope of a speed-time graph indicate?

What conclusion can you draw about the acceleration of a body from the speed-time graph shown below?

What conclusion can you draw about the speed of a body from the following distance-time graph?

What can you say about the motion of a body whose distance-time graph is a straight line parallel to the time axis?

State whether the following statement is true or false: Earth moves round the sun with uniform velocity.

Name the quantitity, the slope of whose graph gives: Acceleration.