Motion Worksheet18

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

What conclusion can you draw about the speed of a body from the following distancetime graph?

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

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

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

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

If a body moves with uniform velocity, its acceleration is....................

The slope of a distancetime graph indicates...............of a moving body.

The slope of a speedtime graph of a moving body gives its..................

In a speedtime graph, the area enclosed by the speedtime curve and the time axis gives the.............by the body.

It is possible for something to accelerate but not change its speed if it moves in a……………

Is the uniform circular motion accelerated? Give reasons for your answer.

Write the formula to calculate the speed of a body moving along a circular path. Give the meaning of each symbol which occurs in it.

Explain why, the motion of a body which is moving with constant speed in a circular path is said to be accelerated.

What is the difference between uniform linear motion and uniform circular motion? Explain with examples.

State an important characteristic of uniform circular motion. Name the force which brings about uniform circular motion.

Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s^{2}.

Describe the motion of a body which is accelerating at a constant rate of 10 m/s^{–2}. If the body starts from rest, how much distance will it cover in 2 s?

A motorcycle moving with a speed of 5 m/s is subjected to an acceleration of 0.2 m/s^{2}. Calculate the speed of the motorcycle after 10 seconds, and the distance travelled in this time.

A bus running at a speed of 18 km/h is stopped in 2.5 seconds by applying brakes. Calculate the retardation produced.
Answer:

The speed of body is constant (or uniform)

Uniform speed

The body is not moving. It is stationary

Nonuniform acceleration

Accelerated

Uniform circular motion ; Accelerated

Zero

Speed

Acceleration

Distance travelled

Circular path

–

–

–

–

–

25 m/s
V = u + at where a = 2.5 m/s^{2} and t =10 and v = 0 since the car is stopped.

Use equation of motion
S = ut + ½ at^{2}
S = 0t + ½ 10 × 2 × 2
S = 20 m

–

Using equation of motion;
V = u + at, putting the values of u,v and t
U = 5 m/s ( converting into m/s) , t = 2.5 sec and v = 0
a = 2 m/s^{2}