Newton's 2nd Law RETAKE

Reorder the following resulting accelerations in order from smallest to greatest

• <-------.--->

• <--.-->

• <--.---------------->

A 70 kg child baseball player moving rightward slides into home plate and slows down due to friction.  Their acceleration is 6 m/s² leftward.    FIND the NORMAL FORCE, GRAVITATIONAL FORCE and FORCE of  FRICTION.  

f

d

i

a

6 m/s²

0 N

686 N

-420 N

500 N

-686 N

420 N

-500 N

70 kg

A 300 N box is pushed across the floor with a force of 500 N. Friction opposes the box with a force of 250 N. Match the forces into the correct categories.

Groups:

(a) Horizontal Forces

,

(b) Vertical Forces

• 300 N

• 500 N

• -250 N

• -300 N

A 500 N box is pushed rightward with a force of 30 N. Friction opposes the box with a force of 10 N. What is the net force (ΣF)?

• 470 N

• • -20 N

• 40 N

• 20 N

• 530 N

A 25 N box is pushed rightward with a force of 500 N. If acceleration is RIGHTWARD, F_{1 will be} ​ (a)   . ​ ​

• 500 N
• 25 N
• -25 N

A 40-kg grocery sack is lifted with a force of 500 N.  What is the acceleration of the grocery sack?

• 40

• Mass =

• 2.7

• acceleration =

• -392

• ΣF =

• 500

• UNKNOWN FORCE...F_{2 =}

• 108

• GIVEN FORCE...F_{1 =}

Acceleration and net force are (a)   , so if acceleration is 10 m/s² and net force gets 2x bigger, acceleration becomes ​ (b)  

• directly related
• inversely related
• 20 m/s2
• 12 m/s2
• 8 m/s2
• 10 m/s2

Acceleration and mass are ​ (a)   , so if acceleration is 10 m/s² and mass gets 2x bigger, acceleration becomes ​​ (b)  

• inversely related
• 30 m/s/s
• 15 m/s/s
• 10 m/s/s
• directly related
• 20 m/s/s
• 5 m/s/s

Match the following symbols with their units

• -9.8 m/s²

• m

• m/s²

• a

• kg

• g

• N

• f