PHYSICAL SCIENCE EXAM QUESTIONS AND CORRECT
ANSWERS GRADED A+
What is the total displacement of a student who walks 3 blocks east, 2 blocks
north, 1 block west, and then 2 blocks south?
2 blocks east
A car travels 20. meters east in 1.0 second. The displacement of the car at the end
of this 1.0-second interval is
20 m east
A student walks 1.0 kilometer due east and 1.0 kilometer due south. Then she
runs 2.0 kilometers due west. The magnitude of the student's resultant
displacement is closest to
1.4 km
A softball player leaves the batter's box, overruns first base by 3.0 meters, and
then returns to first base. Compared to the total distance traveled by the player,
the magnitude of the player's total displacement from the batter's box is
smaller
A girl leaves a history classroom and walks 10. meters north to a drinking
fountain. Then she turns and walks 30. meters south to an art classroom. What is
the girl's total displacement from the history classroom to the art classroom?
20 m south
Momentum has
, magnitude and direction
momentum= mass X force
false
momentum = ?
mass X velocity
do all objects have momentum?
all moving objects have momentum
A car has a mass of 100kg and is not moving. What is the momentum of the car?
Momentum = zero
A car has a mass of 100kg and is moving at 20 m/s. What is the momentum of the
car?
100kg X 20 m/s = 20,000 kg m/s
What is conservation of Momentum?
the total momentum before an event is equal to the total momentum after an event
A Skateboarder has a mass of 75kg. After juping off the skateboard, he moves
backwards at 2 m/s. The skateboard has a mass of 4 kg. Calculate the forwards
velocity of the skateboard.
Momentum of the skateboard= 75kg x 2 m/s = 150 kg m/s
*to calculate the velocity of the skateboard you divide 150 by 4 = 37.5 m/s
VELOCITY = 37.5 M/S
A van with a mass of 2,00 kg is traveling at 30 m/s. It collides with a stationary car
with a mass of 800 kg.Both the van and the car continue moving together.
Calculate the velocity of the van and car together.
ANSWERS GRADED A+
What is the total displacement of a student who walks 3 blocks east, 2 blocks
north, 1 block west, and then 2 blocks south?
2 blocks east
A car travels 20. meters east in 1.0 second. The displacement of the car at the end
of this 1.0-second interval is
20 m east
A student walks 1.0 kilometer due east and 1.0 kilometer due south. Then she
runs 2.0 kilometers due west. The magnitude of the student's resultant
displacement is closest to
1.4 km
A softball player leaves the batter's box, overruns first base by 3.0 meters, and
then returns to first base. Compared to the total distance traveled by the player,
the magnitude of the player's total displacement from the batter's box is
smaller
A girl leaves a history classroom and walks 10. meters north to a drinking
fountain. Then she turns and walks 30. meters south to an art classroom. What is
the girl's total displacement from the history classroom to the art classroom?
20 m south
Momentum has
, magnitude and direction
momentum= mass X force
false
momentum = ?
mass X velocity
do all objects have momentum?
all moving objects have momentum
A car has a mass of 100kg and is not moving. What is the momentum of the car?
Momentum = zero
A car has a mass of 100kg and is moving at 20 m/s. What is the momentum of the
car?
100kg X 20 m/s = 20,000 kg m/s
What is conservation of Momentum?
the total momentum before an event is equal to the total momentum after an event
A Skateboarder has a mass of 75kg. After juping off the skateboard, he moves
backwards at 2 m/s. The skateboard has a mass of 4 kg. Calculate the forwards
velocity of the skateboard.
Momentum of the skateboard= 75kg x 2 m/s = 150 kg m/s
*to calculate the velocity of the skateboard you divide 150 by 4 = 37.5 m/s
VELOCITY = 37.5 M/S
A van with a mass of 2,00 kg is traveling at 30 m/s. It collides with a stationary car
with a mass of 800 kg.Both the van and the car continue moving together.
Calculate the velocity of the van and car together.
