A disadvantage of friction is that
It creates heat inside a car engine
It prevents us from slipping when we walk
It allows us to hold things
It allows us to write
The acceleration in a body is due to :
Balanced force
Unbalanced force
Mass
Electrostatic force
The force used by an archer to pull a bow is:
muscular force
friction force
gravitational force
elsatic spring force
A and B are two objects with masses 100 kg and 75 kg respectively, What will be their inertia ?
both will have the same inertia
B will have more inertia
A will have more inertia
Inadequate data
Which of the following is NOT attributable to application of force?
Rowing of a boat
Bursting of a balloon while blowing
Pedaling a cycle
Catching a moving cricket ball
S.I. unit of force is
Kg ms-1
Kg ms
Nm
N
The physical quantity, which is equal to rate of change of momentum is :
Displacement
Acceleration
Force
Impulse
An athlete can take a longer jump if he comes running from a distance as compared to that when he jumps suddenly. Identify the type of inertia :
Inertia of rest
Inertia of motion
Inertia of direction
Inertia of position
Study the given actions.
i) Striking a match stick.
ii) Sharpening a knife.
iii) Pushing a cupboard from one room to another.
iv) Writing with a pencil.
Friction is useful for
i and ii only
i and iii only
i, ii and iv only
All of the above
Pressure varies with force (F) as (providing area is same)
F
F2