Science Question Answer (1 Marks)

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.

Change the speed of 6m/s into km/h.

State whether distance is a scalar or a vector quantity.

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?

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

Is displacement a scalar quantity?

Convert a speed of 54km/h into m/s.

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.

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

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?

Name the quantity which is measured by the area occupied under the velocity-time graph.

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?

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

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.

What term is used to denote the change of velocity with time?

What do the following measure in a car?

1. Speedometer.
2. Odometer.

In addition to speed, what else should we know to predict the position of a moving body?

Give one example of a motion where an object does not change its speed but its direction of motion changes continuously.

What conclusion can you draw about the velocity of a body from the displacement-time graph shown below:

What type of motion is exhibited by a freely falling body?

Name the type of motion in which a body has a constant speed but not constant velocity.

A car is moving along a straight road at a steady speed. It travels 150m in 5 seconds:
How long does it take to travel 240m?

What is the acceleration of a body moving with uniform velocity?

Under what conditions can a body travel a certain distance and yet its resultant displacement be zero?