Laws of Motion
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Laws of Motion
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25 Questions

1. A4 kg mass and 1 kg are moving with equal kineticenergiesThe ratio of the magnitudes of their linearmomenta is [1989]
2. Ashell is fired from a cannon - it explodes in mid air - its total [1994]
3. A person of mass 60 kg is inside a lift of mass 940kg and presses the button on control panelThe liftstarts moving upwards with an acceleration 1.0 m/s 2Ifg = 10 ms-“2 - the tension in the supporting cable is[2011]
4. A man weighing 80 kg - stands on a weighing scalein a lift which is moving upwards with a uniformacceleration of 5m/s2What would be the reading on thescale? (g = 10 m/s2) [2003]
5. A car is moving in a circular horizontal track ofradius 10 m with a constant speed of 10 m/sA bob issuspended from the roof of the car by a light wire oflength 1.0 mThe angle made by the wire with thevertical is [NEET Kar2013]
6. Amonkey is decending from the branch of a treewith constant accelerationIf the breaking strength is75% of the weight of the monkey - the minimumacceleration with which monkey can slide down withoutbreaking the branch is [1993]
7. The mass of a lift is 2000 kgWhen the tension inthe supporting cable is 28000 N - then its acceleration is:[2009]
8. A block of mass m is placed on a smooth wedge ofinclination θThe whole system is acceleratedhorizontally so that the block does not slip on the wedge.The force exerted by the wedge on the block (g isacceleration due to gravity) will be [2004]
9. A ball of mass 150 g - moving with an acceleration20 m/s2 - is hit by a force - which acts on it for 0.1 secTheimpulsive force is [1996]
10. What will be the maximum speed of a car on a roadturn of radius 30 m if the coefficient of friction betweenthe tyres and the road is 0.4 (Take g = 9.8 m/s 2) [1995]
11. A10 Nforce is applied on a body produces anacceleration of 1 m/s2The mass of the body is [1996]
12. Two bodies of masses m and 4m are moving withequal kinetic energiesThe ratio of their linear momentawill be [1988]
13. Ablock has been placed on an inclined plane withthe slope angle θ - block slides down the plane atconstant speedThe coefficient of kinetic friction is equalto [1993]
14. A car of mass 1000 kg negotiates a banked curve ofradius 90 m on a frictionless roadIf the banking angle is45° - the speed of the car is: [2012]
15. A heavy uniform chain lies on horizontal table topIfthe coefficient of friction between the chain and thetable surface is 0.25 - then the maximum fraction of thelength of the chain that can hang over one edge of thetable is [1991]
16. A particle of mass Mis moving in a horizontal circleof radius Rwith uniform speed VWhen it moves fromone point to a diametrically opposite point - its [1992]
17. A conveyor belt is moving at a constant speed of2m/sA box is gently dropped on itThe coefficient offriction between them is µ = 0.5The distance that thebox will move relative to belt before coming to rest on ittaking g = 10 ms-“2 - is [2011M]
18. Ablock of mass 1 kg is placed on a truck whichaccelerates with acceleration 5m/s 2The coefficient ofstatic friction between the block and truck is 0.6Thefrictional force acting on the block is [2001]
19. A stone is dropped from a height hIt hits theground with a certain momentum PIf the same stone isdropped from a height 100% more than the previousheight - the momentum when it hits the ground willchange by: [2012M
20. Aperson slides freely down a frictionless inclinedplane while his bag falls down vertically from the sameheightThe final speeds of the man (VM) and the bag (VB )should be such that [2000]
21. Physical independence of force is a consequence of[1991]
22. Amass of 1 kg is suspended by a threadIt is(i) lifted up with an acceleration 4.9 m/s 2 - (ii) lowered with an acceleration 4.9 m/s 2.The ratio of the tensions is [1998]
23. Starting from rest - a body slides down a 45°inclined plane in twice the time it takes to slide downthe same distance in the absence of frictionThecoefficient of friction between the body and the inclinedplane is [1988]
24. A body of mass M hits normally a rigid wall withvelocity V and bounces back with the same velocityTheimpulse experienced by the body is [2011]
25. If a cricketer catches a ball of mass 150 gm movingwith a velocity of 20 m/s - then he experiences a force of(Time taken to complete the catch is 0.1 sec.) [2001]

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