Which is true from Newton's Third law of motion?
a) For every action force there is a 50% reaction force in the opposite direction.
b) For every action force there is an equivalent reaction force in the opposite direction.
c) Both 1 and 2
d): None of the above
According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move?
In the equation F = ma, what does m represent?
Arrange the items in order of increasing inertia?
Bicycle, bus, Train, car, Scooter
What is the difference between balanced force and unbalanced force?
Newton's First Law of Motion is also called:
a)Law of Friction
b) Law of Reaction
c) Law of Action
d) Law of Inertia
State the various effects of force?
True and False Statements
A) Momentum is a vector quantity
B) Rate of change of momentum is called Force
C) Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion
D) when a bullet is fired from the Gun and gun recoil. This is based on law of inertia
E) The unit of momentum is Kg-m
F) Force is a scalar quantity
G) Action –Reaction pair of force act on different body
I) A object can still run with non-zero velocity event the net force acting on the body is zero
Give reason for each of these
||Why can dust be removed by shaking it, or beating it by a carpet?
||Why do passengers in the bus tend to fall back when it starts suddenly?
||Why is it difficult for a fireman to hose, which ejects large amount of water at a high velocity?
||Why is it advised to tie a rope on the luggage while you travel by the bus?
||Why do passengers jumping out of a rapidly moving bus fall forward with his face downwards, if he does not run forward?
||Why the cricket player moves his hand backwards on catching a fast cricket ball
||What is the use of seat belt in Cars
State the Law of Conservation of Momentum. Deduce this from Newton’s second law of motion?
Download this assignment as pdf
Class 9 Maths Home page
Class 9 Science Home page