Physics Exam 2. Study Guide Questions with
Detailed Verified Answers
A same-size iron ball and wooden ball are dropped
simultaneously from a tower and reach the ground at the
same time. The iron ball has a greater
✓✓ momentum
A 1000-kg car and a 2000-kg car are hoisted to the same
height. Raising the more massive car 2) requires
✓✓ twice as much work
The total momentum of a flock of identical birds could be
zero only if the birds are
✓✓ flying in different directions
The average braking force of a 1000-kg car moving at 10
m/s braking to a stop in 5 s is
✓✓ 2000 N
A feather and a coin dropped in a vacuum fall with
equal
✓✓ accelerations
, If several balls are thrown straight up with different initial
speeds, the quantity that will have the same value along
their paths is their
✓✓ acceleration
Both a 50-kg sack is lifted 2 meters from the ground and a
25-kg sack is lifted 4 meters in the same time. The power
expended in raising the 50-kg sack is
✓✓ the same
When you jump from an elevated position you usually
bend your knees upon reaching the ground, which makes
the time of the contact about 10 times that of a stiff-
legged landing. In this way the average force your body
experiences is
✓✓ about 1/10 as great
Which task requires more work?
-lifting a 50kg sack 2 meters
-lifting a 25kg sack 4 meters
✓✓ both the same
When Peter tosses an egg against a sagging sheet, the
egg doesn't break due to
Detailed Verified Answers
A same-size iron ball and wooden ball are dropped
simultaneously from a tower and reach the ground at the
same time. The iron ball has a greater
✓✓ momentum
A 1000-kg car and a 2000-kg car are hoisted to the same
height. Raising the more massive car 2) requires
✓✓ twice as much work
The total momentum of a flock of identical birds could be
zero only if the birds are
✓✓ flying in different directions
The average braking force of a 1000-kg car moving at 10
m/s braking to a stop in 5 s is
✓✓ 2000 N
A feather and a coin dropped in a vacuum fall with
equal
✓✓ accelerations
, If several balls are thrown straight up with different initial
speeds, the quantity that will have the same value along
their paths is their
✓✓ acceleration
Both a 50-kg sack is lifted 2 meters from the ground and a
25-kg sack is lifted 4 meters in the same time. The power
expended in raising the 50-kg sack is
✓✓ the same
When you jump from an elevated position you usually
bend your knees upon reaching the ground, which makes
the time of the contact about 10 times that of a stiff-
legged landing. In this way the average force your body
experiences is
✓✓ about 1/10 as great
Which task requires more work?
-lifting a 50kg sack 2 meters
-lifting a 25kg sack 4 meters
✓✓ both the same
When Peter tosses an egg against a sagging sheet, the
egg doesn't break due to
