Motion practice

A football player has a mass of 65 kg and is moving with a velocity of 5 m/s. What is the player’s momentum?

• 13 kg • m/s

• 70 kg • m/s

• 305 kg • m/s

• 325 kg • m/s

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

• It is always greater than it was before the collision.

• It is often greater than it was before the collision.

• It is always the same as it was before the collision.

• It is often the same as it was before the collision.

Tags

NGSS.HS-PS2-2

Sayid made a chart listing data of two colliding objects.

According to the law of conservation of momentum, what is the missing value in the chart?

• 4

• 6

• 10

• 16

Tags

NGSS.MS-PS2-1

In a car, how does an air bag minimize the force acting on a person during a collision?

• It increases the change in momentum of the person.

• It decreases the change in momentum of the person.

• It increases the time it takes for the person to stop.

• It decreases the time it takes for the person to stop.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

• a 50kg couch

• a 5kg dining chair

• a 75kg dining table

• an 10kg end table

Tags

NGSS.MS-PS2-2

Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

• increasing the inertia of the car

• decreasing the reaction force

• increasing the action force

• decreasing the mass of the car

Tags

NGSS.HS-PS2-1

Scientists launch a rocket, and they monitor its acceleration and the force exerted by its engines. As the rocket gets higher, the monitors show that the acceleration of the rocket is increasing but the force exerted stays the same. How do Newton’s laws explain why the scientists could expect this to happen?

• The total force stays the same, but the action force is increasing as the reaction decreases.

• The mass of the rocket decreases as fuel is burned, so the acceleration increases.

• The inertia of the rocket increases, which reduces the force needed to change its speed.

• The reaction force is increasing as fuel is burned, which causes a greater acceleration.

Tags

NGSS.HS-PS2-1

Which refers to an object’s resistance to any change in its motion?

• force

• acceleration

• gravity

• inertia

The table shows the relationship between the masses of two objects, the distance between the two objects, and the gravitational force between the objects.

Which conclusion is supported by the data in the table?

• An increase in the mass of an object causes the same decrease in the gravitational force.

• An increase in the distance between the objects causes the same decrease in the gravitational force.

• An increase in the distance between the objects causes a greater change in the gravitational force than the same increase in mass.

• An increase in the mass causes a greater change in the gravitational force than the same increase in the distance between the objects.

Tags

NGSS.MS-PS2-4

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

Which result is expected?

• The hammer hits the ground before the feather on both Earth and the moon.

• The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.

• The hammer and the feather hit the ground together on both Earth and the moon.

• The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.

Tags

NGSS.MS-PS2-4