Work-Energy Theorem

The net work done by a net force acting on an object is equal to the change in the kinetic energy of the object.

• Force-Work Theorem
• Work-Kinetic Energy Theorem
• Force-Kinetic Energy Theorem
• Work-Force Theorem

Tags

NGSS.HS-PS3-1

What is the ΔKE (change in kinetic energy) of a baseball hit with a force of 6000 N that travels 120 m across the field?

(Hint: Final KE - Initial KE)

• 6000J

• 43560000J

• 720000J

• 50J

Tags

NGSS.HS-PS3-1

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work needed to accelerate the box?

• 50 J

• 60 J

• 20 J

• 45 J

Tags

NGSS.HS-PS3-1

True or false: the net work done on a body is equal to its change in kinetic energy.

• True
• False

Tags

NGSS.HS-PS3-1

What does work equal when the final change in kinetic energy equals 20,000 J?

• 0J

• 2041J

• 20,000J

• 4164931J

Tags

NGSS.HS-PS3-1

Which equation would you use to find distance when you know mass, V_f, V_i, and Force?

• W = KE_f - KE_i

• F⋅d = KE

• W = 1/2 mv_f² - 1/2 mv_i²

• F⋅d = 1/2 mv_f² - 1/2 mv_i²

Tags

NGSS.HS-PS3-1

Work can also be shown as

 $W\ =\ \Delta KE$ 

How do you find  $\Delta KE$  ?

•  $KE_i\ -\ KE_f$  

•  $KE_f\ -\ KE_i$  

•  $KE\ +\ KPOP\ =\ BbyMtl$  

•  $42?$  

Tags

NGSS.HS-PS3-1

What are the units for Work?

• Newtons

• Kilograms

• Joules

• Moles

Tags

NGSS.HS-PS3-2

For an object sliding on the ground, the friction force

• always acts in the same direction as the displacement

• always acts in a direction perpendicular to the displacement

• always acts in a direction opposite to the displacement.

• acts either in the same direction as the displacement or in the

  direction opposite to the displacement depending on the value of the coefficient of kinetic friction.

Tags

NGSS.HS-PS2-1

Which of the following statements are true about potential energy?

• Both gravitational and elastic potential energy are dependent upon the speed of an object.

• Moving objects cannot have potential energy.

• None of these

• Potential energy is the energy stored in an object due to its position.

Tags

NGSS.MS-PS3-2