PHYSICS CH 2 Motion Science - PHYSICS CH 2 Motion

The centrifugal force is ______.

Which of the following graph represents uniform motion of a moving particle?

Which one of the following is most likely not a case of uniform circular motion?

The area under velocity – time graph represents the

• velocity of the moving object.

• displacement covered by the moving object.

• speed of the moving object.

• acceleration of the moving object

The force responsible for drying clothes in a washing machine is …………….

Assertion: Displacement of a body may be zero when distance travelled by it is not zero.
Reason: The displacement is the shortest distance between initial and final position.

Assertion: The Speedometer of a car or a motor-cycle measures its average speed.
Reason: Average velocity is equal to total displacement divided by total time taken.

Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.
Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.

Assertion : The slope of distance-time graph of a body moving with high speed is steeper than slope of distance-time graph of a body with low velocity.
(a) If both assertion & reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion & reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If assertion & reason both are false.
(e) If assertion is false but reason is true.

Assertion : Position-time graph of a stationary object is a straight line parallel to time axis. ’
Reason : For a stationary object, position does not change with time.
(a) If both assertion & reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion & reason are true but the reason is not correct explanation of the assertion.
(c) If the assertion is true but the reason is false.
(d) If assertion & reason both are false.
(e) If assertion is false but reason is true.

Exercise Problem.

A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?

What is meant by uniform circular motion? Give two examples of uniform circular motion.

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

What do you understand about negative acceleration?

Compare speed and velocity

Exercise Problems.

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 m and 20 s?

What remains constant in uniform circular motion? And what changes continuously in uniform circular motion?

When a body is said to be in (i) uniform acceleration (ii) non – uniform acceleration?

Define uniform circular motion and give an example of it. Why is it called accelerated motion?

Explain different types of motion.

Derive the equations of motion by graphical method.

Negative acceleration is called ______.

The slope of the distance-time graph at any point gives______.

Speed is a ______ quantity whereas velocity is a ______ quantity.

Consider an object is rest at position x = 20m. Then its displacement – time graph will be straight-line ………………… to the time axis.

The separation of cream from milk-hn example for the application of ………………….

Define velocity.

State whether true or false. If false, correct the statement.

If the velocity – time graph of a particle is a straight line inclined to X-axis then its displacement – time graph will be a straight line.

• True

• False

State whether true or false. If false, correct the statement.

The velocity – time graph of a particle falling freely under gravity would be a straight line parallel to the x axis.

• True

• False

State whether true or false. If false, correct the statement.

Distance covered by a particle never becomes zero but displacement becomes zero.

• True

• False

State whether true or false. If false, correct the statement.

Acceleration can get negative value also.

• True

• false

State whether true or false. If false, correct the statement.

The motion of a city bus in a heavy traffic road is an example for uniform motion.

• True

• False