1. A truck moves away from you at constant velocity (as observed by you while st
ID: 2143150 • Letter: 1
Question
1. A truck moves away from you at constant velocity (as observed by you while standing in the middle of the road). Which of the following is true?
A truck moves away from you at constant velocity (as observed by you while standing in the middle of the road). Which of the following is true? The net force acting on the truck is zero A constant net force acts on the truck in the direction of its velocity. No forces act on the truck. The net force acting on the truck is its weight. 2.For each case, identify the force (including its direction) that causes the acceleration. A sprinter at the very start of the race. the gravitation force by Earth on the sprinter the backward direction the normal force of the block on the sprinter the forward direction (b) A hockey puck skidding freely but slowly coming to rest on the ice. the frictional force by the ice on the puck the gravitation force by Earth on the puck the parallel direction to the velocity the opposite direction to the velocity A long fly ball at the top of its arc. the frictional force by the air on the ball the downward direction the gravitation force by Earth on the ball the upward direction (d) A bungee jumper at the very bottom of her descent. the upward direction the downward direction the force exerted by the bungee cord on the jumper the gravitation force by Earth on the jumper A block of mass m rests on a plane inclined at an angle ? with the horizontal. It follows that the coefficient of static friction between the block and the plane is 5. A block of mass m is at rest on a plane inclined at angle of 30 degree with the horizontal. Which of the following statements about the magnitude of the static frictional force fs is necessarily true?Explanation / Answer
1) The net force acting on the truck is zero
2)
a) the normal force of the block on the sprinter the forward direction
b) the frictional force by the ice on the puck the opposite direction to the velocity
c) the downward direction the gravitation force by Earth on the ball
d) the upward direction the force exerted by the bungee cord on the jumper
3)
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