Physical science
A truck speeds up from a velocity of 8 m/s to 16 m/s in 2 seconds. What is the truck's acceleration?
4 m/s squared
Sally took the bus from her home to her grandma's. The bus traveled 40 miles for 2 hours. What is the speed at which the bus was traveling at?
40 miles/2 hours = 20mph
Momentum has
magnitude and direction
momentum = ?
mass X velocity
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
what is acceleration? (specific)
the rate at which an object changes its velocity
What is conservation of Momentum?
the total momentum before an event is equal to the total momentum after an event
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.
velocity = 21.4 m/s
If shantanu was able to travel 5 km north in 1 hour in his car, what was his average velocity?
velocity = 5 km/hour north
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
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 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
A group of bike riders took a 4.0-hour trip. During the first 3.0 hours, they traveled a total of 50. kilometers, but during the last hour they traveled only 10. kilometers. What was the group's average speed for the entire trip?
15 km/hr
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
What is acceleration?
Acceleration is when you are changing the speed at which you're going at. For example, you cannot be accelerating when you're going at a constant speed because it's constant, and is not changing.
A car has a mass of 100kg and is not moving. What is the momentum of the car?
Momentum = zero
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
Can acceleration occur when there is a change in direction?
acceleration also occurs when there is a change in direction. It can be a slight bend in the road which can cause an increase in acceleration, but a less sharper turn can cause a lower acceleration because there is a smaller change in direction
do all objects have momentum?
all moving objects have momentum
One car travels 40. meters due east in 5.0 seconds, and a second car travels 64 meters due east in 8.0 seconds. During their periods of travel, the cars definitely had the same
average speed
What is a net force?
combo. of all the forces acting on an object
Is displacement a scalar or vector?
displacement has direction so its a vector quantity
what is displacement?
displacement is the overall change in position
How do you calculate velocity?
displacement/time
Is distance a scalar or vector?
distance does not have direction so it is a scalar quantity
what is distance?
distance is a measurement of length between two points
How do you calculate speed?
distance/time
momentum= mass X force
false
How do you calculate acceleration?
final velocity- initial velocity/time = average acceleration
What are balanced forces?
forces that are equal in size but opposite in direction, balanced forces cause no change in motion, and the object won't move
what are unbalanced forces?
forces that cause a change in the motion of an object, they aren't equal and opposite, more than one force can act on an object at the same time
What is a vector quantity?
has both a magnitude and a direction
What is a scalar quantity?
has just a magnitude and no direction