Reference Point and Reference Frame

Q.

What is reference point ? When we say this is in motion or that is in rest?

Q.

Rest and motion are _____terms.

Q.

A ball is dropped from the roof of a building. It takes 10seconds to reach the ground. Find the height of the building.(g=9.8m/s2

Q.

A man standing on a table rotating about the central axis pulls his hands holding the dumbbells towards his chest. How the angular velocity will change?

Q.

Consider the following situation.

The car appears to be in motion with respect to

1. Both A and B

2. Neither person A nor B

3. Person A

4. Person B

Q.

A stone is dropped from the edge of the roof.

(a) how long does it take to fall 4.9m?

(b) how fast does it move at the end of that fall?

(c) what is the acceleration move at the end of 7.9m?

Q.

When an object falls freely to the ground, its acceleration is constant.

Reason?

Q. ntA freely falling object falls through a height of h in nth second. What is the fall of height in the next second ?n ntA) h-gn ntB) hgn ntC) h+gn ntD) h/gn ntn

Q.

a stone is dropped from the height 4.9 m high roof find out the following a.time taken to fall 4.9m b.velocity just before it reaches the ground c. what is its acceleration after 1s and 2 s from start

Q.

What is free fall

Q.

Which of the following statement(s) about motion is/are true?

1. All of these

2. Motion of an object is only relative to the position of another object.

3. Change in motion is the result of an applied force.

4. Motion is change of location or position of an object with respect to time.

Q.

What do you mean by free fall? [2 MARKS]

Q.

What is meant by a body at rest?

Q.

Force has only magnitude.

1. True
2. False

Q.

The SI unit of force is the joule.

1. True
2. False

Q. A particle takes "n" seconds less and acquires a velocity "u m/s" higher at one place in falling through the same distance.the product of the acceleration s due to gravity at two places is

Q.

What is the initial velocity of an object during a free fall?

Q.

What are the unequal and opposite forces acting on a body, which change its state of rest or uniform motion called?

Q. Question 2
According to the third law of motion, action and reaction
(a) always act on the same body
(b) always act on different bodies in opposite directions
(c) have same magnitude and directions
(d) act on either body at normal to each other

Q.

A book lying on the table is an example of a body neither at rest nor in motion.

1. True
2. False

Q.

The distance covered by the body between 30-40 seconds is

1. 60m

2. 20m

3. 50m

4. 40m

Q. A body falling from rest covered distances S1, S2 and S3 in first, second, third seconds of its fall. Calculate the ratio of S1, S2 and S3 respectively.

Q.

If a hammer and a one rupee coin are dropped simultaneously from the top of a tower. Which would reach the ground first? (Neglect air/atmosphere)

1. Hammer

2. Coin

3. Both will reach at the same time

4. Can't be said

Q.

Which has more inertia, a truck or scooter?

Q.

Motion along a curved line is called translatory or rectilinear motion.

1. True

2. False

Q.

What is the push or pull on an object known as?

Q.

On what factor does inertia depend?

Q.

The SI unit of force is newton.

1. True
2. False

Q.

On pulling a string, its_____________ increases.

Q.

_____ is a push or pull