A 1600kg car is traveling over a hill that has a radius of curvature of 25m. The car is slowing down as it goes over the hill. It slows down at a constant rate from a speed of 25m/s to a speed of 10m/s over a distance of 50m

ending at the top of the hill. The net acceleration of the car at the top of the hill is most nearly

• 4.0

• 5.3

• 6.6

• 9.3

Tags

NGSS.HS-PS2-1

A skier is traveling down a slope that is inclined 30 ° above the horizontal. The coefficient of kinetic friction between the skier and the slope is 0.10. Which of the following best describes the acceleration of the skier?

• 0

• 4.0

• 9.0

• 10.0

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

Blocks A and B have masses M and 2M, respectively. The blocks are connected using a light string and an ideal pulley in the Atwood machine shown. When the blocks are released from rest, block B accelerates downward with acceleration a. Block B is replaced with a block that has twice the mass. The blocks are again released from rest. Which of the following is a correct expression for the new acceleration of the blocks?

• 1/3a

• 5/9a

• 2a

• 9/5a

Tags

NGSS.HS-PS2-1

A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle 𝜙 with the horizontal, as shown above. The frictional force on the block exerted by the surface has magnitude f.

What is the acceleration of the block?

• F/m

• F cos(theta) / m

• (F cos(theta) - f) / m

• (F sin(theta) - mg) /m

Tags

NGSS.HS-PS2-1

A sphere on the end of a string is released from rest at point X and swings through point Y to point Z, as shown in the figure above. Point Y is the lowest point for the sphere as it swings. Air resistance is negligible

• I

• II

• III

• IV

• 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A block of mass mB is being pulled up a ramp by a hanging object of mass mH, as shown in the figure above. The blocks are attached to each other by a light string that passes over a pulley of negligible mass and friction. Both the block and the hanging object are moving at constant speed, and the angle of the ramp with the horizontal is θ . The coefficient of kinetic friction between the block and the ramp is μκ. It is determined that mB = 2.0 kg, θ = 30° , and μk = 0.10. While the block is moving up the ramp and the hanging object is moving downward, the string is suddenly cut. Calculate the magnitude of the acceleration of the block immediately after the string is cut.

• 5.75

• 6.23

• 8.15

• 4.58

Tags

NGSS.HS-PS2-1

Block 1 of mass m1 is placed on block 2 of mass m2, which is then placed on a table. String connecting block 2 to a hanging mass M passes over a pulley attached to one end of the table, as shown above. The mass and friction of the pulley are negligible. The coefficients of friction between blocks 1 and 2 and between block 2 and the tabletop are nonzero and are given in the following table. Determine the largest value of M for which the blocks can remain at rest.

• M = µs2 (m1 + m2)g

• M = (m1 + m2)a + f2

• M = µs2 (m1 + m2)

• 

Tags

NGSS.HS-PS2-1