Directions: Choose the alternative that best completes the statement or answers

Question

Directions: Choose the alternative that best completes the statement or answers the question. Unless otherwise stated, assume ideal conditions (no air resistance, uniform gravity, etc.) When a skier skis down a hill, what is the relationship between the magnitude of the skier's weight w and the magnitude of the normal force n exerted on her by the hill? A stone is thrown upward from the ground. As the stone rises, which quantity remains constant? Three identical blocks are initially at rest a height h above the ground. They are released at the same time. Block A falls straight down; block B slides along a frictionless ramp; block C swings downward from a light string. Which block reaches the ground with the greatest speed? A horizontal force Fx is exerted on an object according to the graph shown. What is the change in the objects horizontal momentum during the interval 1.0 s to 4.0 s. A very large truck moving at 60 mph has a head-on collision with a small compact car moving at 30 mph m the opposite direction. Which vehicle experiences the greater change in its momentum? (Consider only the magnitude of the momentum change.)

Explanation / Answer

1) B - weight > normal force

2) D - none of these

3) A - blockA

4) A - 20 N-s

5) B - car

explanation

1)

the normal force is Mg*cos(theta)

cos < 1

so weight is more than the normal reaction

2)

bith height and velocity are changing

so KE , PE and momentum are also changing

3) BLOCK A as others have tension and normal reaction opposing them

4) calculate area of the triangle = 0.5 * 2 * 20 = 20 N-s

5)the car changes its direction as the truck is heavy ... so the change will ve m(v1 - (-v2)) = m(v1+v2)

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