a) In question 1 you were told that the 25 kg block would go down the ramp while the 32 kg block would go up. But if you weren't told that, you would still know that is what must happen. How do we know that the 25 kg block accelerate down and not the 32 kg block? b) If a block of 10 kg is sitting on the floor, its weight is 98.1 N. What principle of physics tells us that the normal force of the floor on the block is also 98.1 N? Explain clearly how it applies in this case. c) What principle of physics tells us that the block in part b) also exerts a force of 9.81 N down on the floor? Again, explain clearly how it applies in this case. d) A car making a turn without speeding up or slowing down still requires a net force on it in order to make the turn. Why isn’t the net force zero if the car is moving at constant speed? e) When calculating the net torque on an object, we can ignore any forces that are exerted at the pivot point. Why is that? Two blocks on two inclines are attached by a string over a pulley where the two inclines meet. When the blocks are released from rest, the 25 kg block on the 67° incline slides down the incline, pulling the 32 kg block on the 24° incline up its incline. In both cases the coefficient of friction between the block and the incline is 0.13. Determine the acceleration of the blocks and the tension in the string joining them as they accelerate. 32 kg 24° 67° 25 kg
a) In question 1 you were told that the 25 kg block would go down the ramp while the 32 kg block would go up. But if you weren't told that, you would still know that is what must happen. How do we know that the 25 kg block accelerate down and not the 32 kg block? b) If a block of 10 kg is sitting on the floor, its weight is 98.1 N. What principle of physics tells us that the normal force of the floor on the block is also 98.1 N? Explain clearly how it applies in this case. c) What principle of physics tells us that the block in part b) also exerts a force of 9.81 N down on the floor? Again, explain clearly how it applies in this case. d) A car making a turn without speeding up or slowing down still requires a net force on it in order to make the turn. Why isn’t the net force zero if the car is moving at constant speed? e) When calculating the net torque on an object, we can ignore any forces that are exerted at the pivot point. Why is that? Two blocks on two inclines are attached by a string over a pulley where the two inclines meet. When the blocks are released from rest, the 25 kg block on the 67° incline slides down the incline, pulling the 32 kg block on the 24° incline up its incline. In both cases the coefficient of friction between the block and the incline is 0.13. Determine the acceleration of the blocks and the tension in the string joining them as they accelerate. 32 kg 24° 67° 25 kg
in a) the question 1 they are referring to is the second photo. i dont get a-d
Transcribed Image Text:a) In question 1 you were told that the 25 kg block would go down the ramp while the 32 kg
block would go up. But if you weren't told that, you would still know that is what must happen.
How do we know that the 25 kg block accelerate down and not the 32 kg block?
b) If a block of 10 kg is sitting on the floor, its weight is 98.1 N. What principle of physics tells
us that the normal force of the floor on the block is also 98.1 N? Explain clearly how it applies in
this case.
c) What principle of physics tells us that the block in part b) also exerts a force of 9.81 N down
on the floor? Again, explain clearly how it applies in this case.
d) A car making a turn without speeding up or slowing down still requires a net force on it in
order to make the turn. Why isn’t the net force zero if the car is moving at constant speed?
e) When calculating the net torque on an object, we can ignore any forces that are exerted at the
pivot point. Why is that?
Transcribed Image Text:Two blocks on two inclines are attached by a string over a pulley where the two inclines meet.
When the blocks are released from rest, the 25 kg block on the 67° incline slides down the
incline, pulling the 32 kg block on the 24° incline up its incline. In both cases the coefficient of
friction between the block and the incline is 0.13. Determine the acceleration of the blocks and
the tension in the string joining them as they accelerate.
32 kg
24°
67°
25 kg
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