Question

Notes on forces and laws of motion th notes

Answer 1

Answer:

Whenever we push or pull an object a force acts upon them and makes them move from one place to another. Hence, force can –

initiate motion in a motionless object

change (increase or decrease) the velocity of the moving object

alter the direction of a moving object

change the shape and size of an object

Effects of Force

Fig.2 - Effects of Force

Balanced and Unbalanced Forces

Balanced Forces –

When equal amount of forces are applied on an object from different directions such that they cancel out each other

They do not change the state of rest or motion of an object

They may change the shape and size of an object

Balanced Forces

Fig.3- Balanced Forces

Unbalanced Force –

When forces applied to an object are of different magnitude(or not in opposite directions so as to cancel)

They can alter state of rest or motion of an object

They can cause acceleration in an object

They can change the shape and size of an object

Answer 2

Answer:

A body with greater mass has greater inertia. Frictional force: The force that always opposes the motion of objects is called force of friction. Second law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.

hope it helps