Physical Science Unit 3 Post Test

The graph describes the motion of an object.

The object moves with constant acceleration/constant velocity/positive acceleration from A to B. It remains stationary/slows down/speeds up from B to C. It moves with constant acceleration/constant velocity/positive acceleration from C to D.

• constant acceleration; slows down; constant acceleration

• constant velocity; remains stationary; constant velocity

• positive acceleration; speeds up; constant velocity

• constant velocity; slows down; positive acceleration

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

 $a=\frac{\left(v_f-v_i\right)}{t},\ \frac{m}{s^2}$  

A car accelerates from 4 meters/second to 16 meters/second in 4 seconds. What is the car's acceleration?

Tags

NGSS.HS-PS2-1

Which segment of this graph shows a decreasing velocity?

• A to B

• B to C

• C to D

• D to E

• E to F

A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?

• 90 minutes

• 45 hours

• 45 minutes

• 2 hours

• 2 minutes

Adam takes a bus on a school field trip. The bus route is split into the five legs listed in the table. Find the average velocity for each leg of the trip. Then arrange the legs of the trip from highest velocity to lowest.

• A>B>C>D>E

• E>C>D>B>A

• D>C>E>A>B

• C>B>A>E>D

An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and direction of the net force?

• 9 newtons to the right

• 9 newtons to the left

• 22 newtons to the right

• 35 newtons to the right

• 35 newtons to the left

Tags

NGSS.MS-PS2-2

What would be Kelly’s weight be in newtons if her mass is 70 kilograms?

• $70\times g$

• $\frac{70}{g}$

• $\frac{70}{g^2}$

• $70\times g^2$

• 70

Tags

NGSS.MS-PS2-4

An object at rest requires a force of 15 newtons to set it into motion. This force is greater than which force?

• gravity

• friction

• tension

• electromagnetic

• strong nuclear force

In the diagram, a force of 20 newtons is applied to a block. The block is in dynamic equilibrium. What is the magnitude and direction of the frictional force?

• No friction is acting on the block.

• 20 newtons in two directions, perpendicular and in the direction of the applied force

• 20 newtons perpendicular to the direction of the applied force

• 20 newtons opposite to the direction of the applied force

• 20 newtons in the direction of the applied force

Tags

NGSS.HS-PS2-1

Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ball’s journey will gravity be the greatest force acting on the ball?

• The ball is out of Matthew's hand.

• The ball rests on the ground.

• The ball reaches maximum height.

• The ball falls down

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4