2.3 - Acceleration(22pts.)

Juan is standing at the entrance of a park. If the distance and direction between Juan and a reference point (like a tree or a bench) in the park is considered as Juan's _____, what would that be?

• displacement

• neutral point

• position

• velocity

Answer explanation

The correct choice is 'displacement' because displacement refers to the distance and direction between two points, which fits the scenario described in the question.

Tags

HS-PS2-1

Christian leaves his home at 8:00 AM and walks 0.5 km to Julian's house.

At 11:30 AM, he returns home and then travels by car to the mall, which is 10 km away. He arrives at the mall at 11:45 AM.

What is the total distance Christian traveled?

• 2.8 km/h

• 10 km

• 10.5 km

• 11 km

Answer explanation

Christian walked 0.5 km to Julian's house, then drove 10 km to the mall, totaling 10.5 km. The total distance traveled is 11 km when including the return trip home.

Tags

HS-PS2-1

What is the equation for momentum?

• p = m/v

• f = ma

• f = m/a

• p = mv

Answer explanation

The equation for momentum is p = mv, where p represents momentum, m is mass, and v is velocity.

Tags

HS-PS2-2

Maria, Niana, and Avana are observing a soccer ball being kicked into the air. They notice the ball's path curves as it moves. This curvature is caused by _____.

• mass

• circumference

• gravity

• acceleration

Answer explanation

The curvature of the ball's path is caused by gravity, which affects the trajectory of objects in motion.

Tags

HS-PS2-1

Average speed is found by _____.

• multiplying total distance traveled by the total time

• multiplying the displacement by the total time spent

• dividing the displacement by the total time spent

• dividing total distance traveled by the total time

Answer explanation

Average speed is found by dividing total distance traveled by the total time.

Tags

HS-PS2-1

_____ is the speed of an object at any given instant.

• Acceleration

• Average Speed

• Instantaneous Speed

• Velocity

Answer explanation

Instantaneous Speed is the speed of an object at any given instant, making it the correct choice in this context.

Tags

HS-PS2-1

Kaleb is driving his car to the grocery store. The direction and speed at which Kaleb's car is moving is described by its _____.

• Acceleration

• Velocity

• Displacement

• Average Speed

Answer explanation

Velocity describes both the speed and direction of an object's motion, making it the appropriate term to describe Kaleb's car's movement.

Tags

HS-PS2-2

If a runner maintains a constant speed of 12 km/h, how long will it take to complete a marathon race of 42.1 km?

[You may use a calculator]

Mathematical Equivalence

ON

Tags

HS-PS2-1

What is Bill's average running speed?

[You may use a calculator]

• 0.33 km/min

• 3.0 km/min

• 3.33 km/min

• 300 km/min

Answer explanation

To find Bill's average running speed, divide the total distance by the total time taken. Bill ran 1 km in 3 minutes, so his speed is 1 km / 3 min = 0.33 km/min.

Tags

HS-PS2-2

If an object has constant velocity, then it _____.

• is not moving

• has negative acceleration

• has no acceleration

• has positive acceleration

Answer explanation

If an object has constant velocity, then it has no acceleration. Acceleration is the rate of change of velocity, so if velocity is constant, acceleration is zero.

Tags

HS-PS2-2