It is easier to roll a barrel than to pull it along the road. This statement is
not possible
uncertain
false
true
To avoid slipping while walking on ice one should take smallest steps because of the
larger friction
larger normal reaction
smaller friction
smaller normal reaction
A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ=0.5. The distance that the box will move relative to belt before coming to rest on it, taking g=10ms-2 is
Zero
0.4 m
1.2 m
0.6 m
A force of 15 Newton acts on a body of weigh 30 Newton. What is the acceleration produced in metres per second?
Take g = 10ms-2.
15.00
5.00
1.50
0.50
A monkey is descending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking branch is
g
Consider a car moving along a straight horizontal road with a speed of 72 km/hr.If the coeffecient of static friction between the tyres and the road is 0.5,the shortest distance in which the car can be stopped is
(Take g = 10 m/s2)
30 m
40 m
72 m
20 m
A block of 10 kg is pulled at a constant speed on a rough horizontal surface by a force of 20 N.Find the co- effecient of kinetic friction ?Given that g = 10 m/s2 .
0.2
0.5
0.85
0.7
A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g=10ms2, the tension in the supporting cable is
8600 N
9680 N
11000 N
1200 N
A man is standing on a spring platform. Reading of spring balance is 60 kg wt. If man jumps outside from the platform, then reading of spring balance will
increase
become zero
remain same
first (a) and then (b)
A force of 6 N acts on a body at rest and of mass 1 kg. During this time, the body attains a velocity of 30 m/s. The time for which the force acts on the body is
7 seconds
5 seconds
10 seconds
8 seconds
