Physics (Class 10)

Trishna Knowledge Systems

Chapter 2

Dynamics - all with Video Answers

Educators

Chapter Questions

Problem 1

Define IMA and AMA.

Ankur S

Ankur S

Numerade Educator

Problem 2

Define angular displacement and angular velocity.

Manish Kumar

Numerade Educator

Problem 3

The functioning of a common balance is based on the principle of _____

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Problem 4

The area under the force-displacement graph gives _____

Dheeraj Sharma

Numerade Educator

Problem 5

Define linear momentum.

Tara Appleyard

Numerade Educator

Problem 6

Why is the combination of fixed pulley and a moveable pulley preferred to one moveable pulley?

Samuel Smith

Numerade Educator

Problem 7

State Hooke's law.

Ajay Singhal

Numerade Educator

Problem 8

A metre scale is suspended at $50 \mathrm{~cm}$ mark to a rigid support with a weight of $150 \mathrm{~g}$ attached at $5 \mathrm{~cm}$ mark. To balance the scale, a weight of $450 \mathrm{~g}$ should be attached at _____ $\mathrm{cm}$ mark.

Stephen Zaffke

Numerade Educator

Problem 9

Define work and power (write their dot product).

Averell Hause

Carnegie Mellon University

Problem 10

Define centripetal force.

Supratim Pal

Numerade Educator

Problem 11

A particle moves in a circle whose radius is $20 \mathrm{~cm}$ with a linear speed of $10 \mathrm{~m}^{-1}$. Then its angular velocity is _____$\operatorname{rad~s}^{-1}$.

Linda Winkler

Numerade Educator

Problem 12

The weight of a body is minimum at _____on the earth.

Narayan Hari

Numerade Educator

Problem 13

Define couple. Give an example of a couple.

Nick Johnson

Numerade Educator

Problem 14

What is the mechanical advantage of a sheath of pulleys?

Samuel Smith

Numerade Educator

Problem 15

Can Newton's law hold good in all frames of reference?

Zulfiqar Ali

Numerade Educator

Problem 16

A body of mass ' $m$ ' is dropped from a height ' $h$ '. The kinetic energy of the body on reaching the ground is _____

Mir Afzal

Numerade Educator

Problem 17

What are parallel forces?

Sima Sarker

Numerade Educator

Problem 18

Define orbital velocity and escape velocity.

Narayan Hari

Numerade Educator

Problem 19

What is moment of a force or a torque?

Lisa Tarman

Numerade Educator

Problem 20

Wheel and axle is a lever of _____ order.

Ahmed Kamel

Numerade Educator

Problem 21

What is centre of gravity?

Sarah Mccrumb

Numerade Educator

Problem 22

What is the effect of weight of pulleys in the tackle?

Samuel Smith

Numerade Educator

Problem 23

Define centripetal acceleration.

Suzanne W.

Numerade Educator

Problem 24

What is meant by stable equilibrium?

Shazia Naz

Numerade Educator

Problem 25

Define uniform circular motion.

Mayukh Banik

Numerade Educator

Problem 26

The mechanical advantage of an inclined plane $2 \mathrm{~m}$ long and $1 \mathrm{~m}$ high is equal to _____

Narayan Hari

Numerade Educator

Problem 27

Give an expression which relates orbital velocity and escape velocity.

Narayan Hari

Numerade Educator

Problem 28

What is simple machine?

Averell Hause

Carnegie Mellon University

Problem 29

The escape velocity on the surface of the earth is _____$\mathrm{km} \mathrm{s}^{-1}$.

Narayan Hari

Numerade Educator

Problem 30

Give the expression for mechanical advantage of a screw jack.

Pankaj Jain

Numerade Educator

Problem 31

Obtain the relation between angular velocity and linear velocity.

Manish Kumar

Numerade Educator

Problem 32

Why is the efficiency of a multi-stage rocket greater than that of a single stage rocket?

Eduard Sanchez

Numerade Educator

Problem 33

Define angular momentum and give its expression.

Kara Merfeld

Numerade Educator

Problem 34

Explain the working of centrifuge.

David Collins

Numerade Educator

Problem 35

What is banking of roads and rails?

Kaylee Mcclellan

Kaylee Mcclellan

Numerade Educator

Problem 36

. What is inertial frame of reference and non-inertial frame of reference?

Prabhu Ramji

Numerade Educator

Problem 37

A rocket with a mass of $20,000 \mathrm{~kg}$ is blasted upwards with an initial acceleration of $5 \mathrm{~m} \mathrm{~s}^{-2}$. Calculate the initial force of the blast.

Sanu Kumar

Numerade Educator

Problem 38

Mention the uses of artificial satellites.

Narayan Hari

Numerade Educator

Problem 39

State Newton's law of gravitation.

Mathis Ernst

Numerade Educator

Problem 40

A swing is suspended from two parallel ropes at its ends. Two person weighing $50 \mathrm{~kg}_{\mathrm{ma}}$ and $30 \mathrm{~kg}_{\mathrm{ms}}$ sit at a distance $20 \mathrm{~cm}$ and $80 \mathrm{~cm}$ from one end. The weight of the swing is $20 \mathrm{~kg}_{\mathrm{wa}}$. Find the tensions on the rope, Length of the plank of the swing is $100 \mathrm{~cm}$.

Narayan Hari

Numerade Educator

Problem 41

Why is centrifugal force is called pseudo force?

Kara Merfeld

Numerade Educator

Problem 42

What is the relation between $g$ and $G$ ?

Linhan Yang

Numerade Educator

Problem 43

A ball is tied to a string of length $1 \mathrm{~m}$ and is whirled in a horizontal circle with a linear speed of $5 \mathrm{~m} \mathrm{~s}^{-1}$. If the mass of the ball is $1000 \mathrm{~g}$. Find its
(i) angular velocity,
(ii) centripetal force acting on the ball and
(iii) centrifugal force acting on the ball.

Suzanne W.

Numerade Educator

Problem 44

What is the effect of mass on the acceleration of a rocket?

Mayukh Banik

Numerade Educator

Problem 45

Obtain the relation between M.A,V.R. and $\eta$.

Chris Trentman

Numerade Educator

Problem 46

Describe an experiment to determine the weight of a body.

Donald Albin

Numerade Educator

Problem 47

Obtain an expression for banking angle.

Ian Shi

Numerade Educator

Problem 48

Explain the working of wheel and axle.

Pankaj Jain

Numerade Educator

Problem 49

Explain the principle of orbiting satellite.

Prabhu Ramji

Numerade Educator

Problem 50

Explain the working of a screw-jack.

Pankaj Jain

Numerade Educator