PRE-ASSESSMENT - PHYS 206 EXAM STUDY GUIDE
Two metal balls are the same size but one weighs twice as much as the other. The balls
are dropped from the roof of a single story building at the same instant of time. The time
it takes the balls to reach the ground below will be: - ANSWER about the same for both
balls.
Two metal balls are the same size but one weighs twice as much as the other. The two
metal balls roll off a horizontal table with the same speed. In this situation: - ANSWER
both balls hit the floor at about the same horizontal distance from the base of the table.
A stone dropped from the roof of a single story building to the surface of the earth: -
ANSWER speeds up because of an almost constant force of gravity acting upon it.
A large truck collides head-on with a small compact car. During the collision: - ANSWER
the truck exerts the same amount of force on the car as the car exerts on the truck.
The figure shows a frictionless channel in the shape of a segment of a circle with its
center at O.
The channel has been anchored to a frictionless horizontal table top. Forces exerted by
the air are negligible.
You are looking down at the table. A ball is shot a high speed into the channel at p and
exits at r.
Consider the following distinct forces:
1. A downward force of gravit
2. A force exerted by the channel pointing from q to O
3. A force in the direction of motion
4. A force pointing from O to q
Which of the above forces is (are) acting on the ball when it is within the frictionless
channel at position q? - ANSWER 1 and 2
The figure shows a frictionless channel in the shape of a segment of a circle with its
center at O.
The channel has been anchored to a frictionless horizontal table top. Forces exerted by
the air are negligible.
You are looking down at the table. A ball is shot a high speed into the channel at p and
exits at r.
, Which path in the figure below would the ball most closely follow after it exits the
channel at r and moves across the frictionless table top? - ANSWER B (straight up)
A steel ball is attached to a string and is swung in a circular path in a horizontal plane as
illustrated in the accompanying figure. At the point P indicated in the figure the string
suddenly breaks near the ball. If these events are observed directly from above as in the
figure, which path would the ball most closely follow after the string breaks? - ANSWER
B (diagonal)
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Which of the paths above would the puck most closely follow after receiving the kick? -
ANSWER B (diagonal)
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
The speed of the puck just after it receives the kick is: - ANSWER greater than either of
the speeds vo or vk, but less than the arithmetic sum of these two speeds
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Along the frictionless path you have chosen in question 8 (recall figure above), the
speed of the puck after receiving the kick: - ANSWER is constant
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Along the frictionless path you have chosen in question 8 (recall figure above), the main
force(s) acting on the puck after receiving the kick is (are) - ANSWER a downward force
Two metal balls are the same size but one weighs twice as much as the other. The balls
are dropped from the roof of a single story building at the same instant of time. The time
it takes the balls to reach the ground below will be: - ANSWER about the same for both
balls.
Two metal balls are the same size but one weighs twice as much as the other. The two
metal balls roll off a horizontal table with the same speed. In this situation: - ANSWER
both balls hit the floor at about the same horizontal distance from the base of the table.
A stone dropped from the roof of a single story building to the surface of the earth: -
ANSWER speeds up because of an almost constant force of gravity acting upon it.
A large truck collides head-on with a small compact car. During the collision: - ANSWER
the truck exerts the same amount of force on the car as the car exerts on the truck.
The figure shows a frictionless channel in the shape of a segment of a circle with its
center at O.
The channel has been anchored to a frictionless horizontal table top. Forces exerted by
the air are negligible.
You are looking down at the table. A ball is shot a high speed into the channel at p and
exits at r.
Consider the following distinct forces:
1. A downward force of gravit
2. A force exerted by the channel pointing from q to O
3. A force in the direction of motion
4. A force pointing from O to q
Which of the above forces is (are) acting on the ball when it is within the frictionless
channel at position q? - ANSWER 1 and 2
The figure shows a frictionless channel in the shape of a segment of a circle with its
center at O.
The channel has been anchored to a frictionless horizontal table top. Forces exerted by
the air are negligible.
You are looking down at the table. A ball is shot a high speed into the channel at p and
exits at r.
, Which path in the figure below would the ball most closely follow after it exits the
channel at r and moves across the frictionless table top? - ANSWER B (straight up)
A steel ball is attached to a string and is swung in a circular path in a horizontal plane as
illustrated in the accompanying figure. At the point P indicated in the figure the string
suddenly breaks near the ball. If these events are observed directly from above as in the
figure, which path would the ball most closely follow after the string breaks? - ANSWER
B (diagonal)
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Which of the paths above would the puck most closely follow after receiving the kick? -
ANSWER B (diagonal)
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
The speed of the puck just after it receives the kick is: - ANSWER greater than either of
the speeds vo or vk, but less than the arithmetic sum of these two speeds
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Along the frictionless path you have chosen in question 8 (recall figure above), the
speed of the puck after receiving the kick: - ANSWER is constant
The figure depicts a hockey puck sliding with constant speed vo in a straight line from
point a to point b on a frictionless horizontal surface. Forces exerted by the air are
negligible. You are looking down on the puck. When the puck reaches point b, it
receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck
been at rest at point b, then the kick would have set the puck in horizontal motion with
speed vk in the direction of the kick.
Along the frictionless path you have chosen in question 8 (recall figure above), the main
force(s) acting on the puck after receiving the kick is (are) - ANSWER a downward force
