Newton’s laws of motion

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Newton’s laws of motion

Test1 Max. Marks = 40

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4 points

(a) 980 N

(b) 49 N

(d) 490 N

Clear selection

2. A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2 while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be

4 points

(a) 900 N

(b) 100 N

(d) 1200 N

Clear selection

3. If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor

4 points

(a) 75 N

(b) 50 N

(d) 25 N

Clear selection

4 points

(a) 0.5 m/s²

(b) 5 m/s²

(d) 15 m/s²

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4 points

(a)

(b)

(c)

(d)

Clear selection

6.Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of kinetic friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is [g = 10 m s⁻²]

4 points

(a) 30 m

(b) 40 m

(d) 20 m

Clear selection

7. A horizontal force of 129.4 N is applied on a 10 kg block which rests on a horizontal surface. If the coefficient of friction is 0.3, the acceleration should be

4 points

(a) 9.8 m / s²

(b) 10 m / s²

(d) 19.6 m / s²

Clear selection

4 points