Unit 5 (Forces) Test Corrections

Velocity and speed both show how fast something is going, but how is velocity different from speed?

• Speed has a direction; velocity does not.

• Velocity has a direction; speed does not.

• Speed has units; velocity does not.

• Velocity has units, speed does not.

What is the formula for acceleration?

• a = (v_f - v_i) / t

• S = d/t

• v = d/t

• a = (v_{i -} v_f ) / t

Tags

NGSS.HS-PS2-1

Acceleration is a change in what two things?

• direction and/or speed

• force and/or mass

• direction and/or mass

• speed and/or force

All of the following are examples of acceleration EXCEPT –

• Changing directions

• Slowing down

• Speeding up

• Moving in a straight line and at a constant speed

What is the formula for velocity?

• a = (v_f - v_i) / t

• S = d/t

• v = d/t

• a = (v_{i -} v_f ) / t

A plane flew 2000 kilometers, from Virginia to California, in 5 hours. What was the velocity of the plane during its flight?

• 400 km/hr

• 10,000 km/hr West

• 10,000 km/hr

• 400 km/hr West

What is the formula for work?

• a = (v_f - v_i) / t

• w = F*d

• v = d/t

• F = m*a

What is the formula for power?

• P = w/t

• w = F*d

• v = d/t

• F = m*a

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

It took Bradley 45 s and 60 N of force to move a sofa 5 m into a moving truck. How much power did he exert? (solve for work first, then power).

• 300 W

• 6.67 W

• 1.33 W

• 12 W

Which has more gravitational pull on the moon?

The earth or the sun?

• The earth because it is larger than the moon and a smaller distance to the moon than the sun.

• The sun because it is larger than the moon and a greater distance from the moon than the earth.

• Neither, gravity is fake news.

• Both have equal gravity on the moon.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5