A small mass m slides with negligible friction down an incline at an angle of 25
ID: 1420027 • Letter: A
Question
A small mass m slides with negligible friction down an incline at an angle of 25.76° with respect to the horizontal. It then drops down to a horizontal surface and bounces elastically back up as shown. The picture is to scale. It shows the position of the mass at equal time intervals starting from rest at X. The height of the mass at Q is the same as at R.
The mechanical energy of m at V is _____that at Q. •
The velocity of m at Q is _____that at R. • T
he speed change between U and P is _____between X and U. •
The speed of m at R is _____that at S. •
The size of the total force on m at T is ____at V. •
The size of the total force on m at U is ____at Q.
Answer choices Less than, Greater than, or Equal to
Explanation / Answer
The mechanical energy of m at V is less than that at Q. • beacuse height of point Q is more than V
The velocity of m at Q is equal to that at R
because K.E = potential energy and potenatil energy is same at both point so Kinetic energy will be same at both point so speed will be same
The size of the total force on m at T is greater than at V.
beacuse at T there is impulsive force of high value
The size of the total force on m at U is equal to at Q.
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