unit test review

Two vehicles, J and K, of equal mass are traveling down a street. What is one reason that upon approaching a stoplight, vehicle J takes twice as long to come to a stop as compared to vehicle K?

• Vehicle K had less mass.

• Vehicle J had less velocity

• Vehicle K had a greater mass

• Vehicle J had a greater velocity

A 2000 kg bus and a 750 kg car are traveling down a street at the same velocity. When approaching a stoplight, which vehicle would need to apply its brakes first?

• The bus would need to apply its brakes first because it has greater momentum due to its larger mass and would need a longer stopping distance

• The bus would need to apply its brakes first because the larger mass causes it to have a greater acceleration which requires more time to decelerate.

• The bus would need to apply its brakes first because the larger mass causes it to have a greater acceleration which requires more time to decelerate.

• D Both vehicles would need to apply brakes at the same time because the velocity and acceleration are the same for both

Tags

NGSS.MS-PS2-2

Jasmine is driving a car and has a mass of 60 kg. Laura is her passenger and has a mass of 90 kg. Jasmine suddenly brakes to avoid hitting a deer. Who experiences the greatest force due to the seatbelt?

• Jasmine. She has the least mass.

• Laura. She has the greatest mass

• Laura. She has the greatest speed

• Jasmine. She has the least speed.

Tags

NGSS.MS-PS2-2

A baseball player is able to swing with exactly the same amount of force every time. Which object would leave the bat with the greatest speed when struck by the player?

• 45 gram golf ball

• 145 gram baseball

• 540 gram croquet ball

• an 8200 gram bowling ball

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Two separate cannons with the same explosive charge fire different sized cannon balls. One cannon ball weighs 2 kg, and the other weighs 4 kg. The lighter 2-kg ball travels twice as fast from the cannon as the heavier 4-kg ball. Which of Newton's laws explains this behavior?

• Newton's 1 st Law

• Newton's 2 nd Law

• Newton's 3 rd Law

• Newton's 4 th Law

Tags

NGSS.HS-PS2-1

To have motion, a body must experience a change in what?

• velocity

• position

• direction

• acceleration

How is the acceleration of an object traveling in a straight line determined?

• The time it took the object to travel is divided by the distance the object traveled during that time.

• The distance the object traveled is divided by the time it took the object to travel the distance

• The change in the speed of the object is divided by the amount of time in which the change occurred.

What is true about an object that is used as a reference point for determining motion?

• It is stationary

• It is accelerating.

• It is changing direction

Physicists use reference points when tracking an object's motion. What is a necessary requirement for a valid reference point?

• It is accelerating.

• It is stationary.

• It is decelerating

• It is charging direction

The average speed of a car during 5 hours is 50 miles per hour. What is the total distance traveled by the car?

• 0.1 miles

• 10 miles

• 250 miles

• 500 miles