If a bus starts suddenly, the passengers in the bus will tend to fall

1

(a)

in the direction opposite to the direction of motion of the bus

(b)

in the same direction as the direction of motion of the bus

(c)

sideways

(d)

none of the above

An athlete runs some distance before taking a long jump because

1

(a)

he gains energy to take him through long distance

(b)

it helps him to apply large force

(c)

by running action and reaction forces increase

(d)

by running the athlete gives himself larger inertia of motion

A rider on a horseback falls back when horse starts running all of a sudden because

1

(a)

rider is taken back

(b)

rider is suddenly afraid of falling

(c)

inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse.

(d)

none of the above

The above problem can be explained on the basis of the property of

1

(a)

inertia

(b)

force

(c)

torque

(d)

momentum

The combined effect of mass and velocity is taken into account by a physical quantity called

1

(a)

torque

(b)

momentum

(c)

moment of force

(d)

moment of momentum

State the various effects produced by a force.

1

(a)

Define resultant force.

1

(a)

A ball is moving over a horizontal smooth surface with a constant velocity. What type of forces are acting on the ball?

1

(a)

Name the forces (type of forces) when their resultant force acting on a body is not zero.

1

(a)

Can the velocity of a body change when no unbalanced force is acting on it?

1

(a)