Question

A Body Of Mass 40 G Is Moving With A Constant Velocity Of 2 Cm/'S On A Horizontal Friction Less Table The Force On The Body (Dynes )Is

Answer 1

Answer:

mass = 40 g = 40 *10^ -3kg

Force N = mg

= 40 *10^ -3 * 9.8 newtons { g = 9.8}

force = 392* 10^ -3 Newton .

to convert it into dynes multiply by 100000

or 10^5 .

= 392 *10^ -3 *10 ^ 5

= 392 * 10^ 2 dyne

Explanation:

a body of mass 40 grams is given which moves with constant velocity ( hence f= mass *change in velocity / time cannot be used here) . According to Newtons second law f = mass * acceleration.Since the body is in contact , therefore we will use concept of contact forces to calculate the force . when a body is in contact with ground and is being pressed by it , only then force will apply .

Answer 2

Answer:

since acceleration is 0 due  to constant velocity force is also zero

Explanation: