Question
u can choose any 7 of 8 questions. Each question has 20 points. If you finish questions, please mark the 8th question for extra points. t. Give an example of an object that has three forces acting on it and is (a) in and (b) at rest 2. A large box whose mass is 20.0 kg rests on the frictionless floor. A mover box with a force of 250 N at an angle 35.0 degree below the horizontal. Draw body diagram and calculate the acceleration of the box 3. In the question 2, if the kinetic friction coefficient is 0.1 between the Draw the box?s free body diagram and re-calculate the acceleration of the 4. Three books sit on one another on a friction less surface. The top book has the middle book a mass of 2 kg. and the bottom book a mass of 3 kg. A horizontally on the middle book with a force of 6 N. If the books stay together draw the free body diagram and what is the horizontal friction force acting on the 5. A 20kg box rests on a frictionless ramp with a 15.0 degree slope. The mover pulls on a rope attached a box to pull it up the incline. If the rope makes an angle of 40.0? with the horizontal, what is the smallest force the mover will have to exert on the box to move up the ramp?
Explanation / Answer
1)
a)
at rocket launched from earth ,
has gravity , air resistance and thrust force acting on it
and it is accelerated upwards
b)Cars parked on a windy day on an incline ,
has three forces acting ,
Friction force , Gravity and Wind force
but it is in rest
