Laws of motion Gr 9

An object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.

• First law of motion

• Second law of motion

• Third law of motion

• Universal law of gravitation

The natural tendency of objects to resist a change in their state of rest or of uniform motion is called-------

• motion

• momentum

• impulse

• inertia

The-----------of an object is a measure of its inertia.

• weight

• mass

• length

• velocity

The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.

• First law of motion

• Second law of motion

• Third law of motion

• Universal law of gravitation

The SI unit of force is kg m s–2. This is also known as newton.

• True

• False

The momentum of an object is the product of its --------- and -----------

• weight , velocity

• weight, acceleration

• mass , acceleration

• mass, velocity

The direction of momentum is--------

• opposite to that of velocity

• same as that of velocity

• perpendicular to velocity

To every action, there is an equal and opposite reaction

• First law of motion

• Second law of motion

• Third law of motion

• Universal law of gravitation

The action and reaction acts on---------

• same bodies

• two different bodies

In an isolated system, the------------remains conserved.

• initial momentum

• final momentum

• total momentum