Physics Review Work and Energy

By what factor will the kinetic energy of an object increase if the velocity of the object is tripled?

• The kinetic energy will stay the same.

• 3

• 6

• 9

Tags

NGSS.MS-PS3-1

An 8-kg object is raised by a crane to the top of a building 20-meters in height. If it takes 50 seconds for the object to get to the top of the building, then how much power was needed?

• 1600 watts

• 3.2 watts

• 32 watts

• 200 watts

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NGSS.MS-PS3-5

A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:

• Negative

• Zero

• Positive

• Undefined

Tags

NGSS.HS-PS2-4

A force of 50-N is applied to a 4 kilogram mass. The acceleration of the object is:

• 200 m/s²

• 12.5 m/s²

• 54 m/s²

• 46 m/s²

Tags

NGSS.MS-PS2-2

Which law states that the total energy in a closed system remains constant?

• Law of Conservation of Momentum

• Law of Conservation of Energy

• Newton's First Law of Motion

• Hooke's Law

Tags

NGSS.HS-PS3-2

An object is thrown vertically upward with an initial speed of 15 m/s. What is the total time in the air?

• 3 second

• 1.5 seconds

• 5 seconds

• 3.5 seconds

Tags

NGSS.MS-PS2-4

A kg-m²/s² is otherwise known as a(n)

• Newton

• Joule

• Watt

• Displacement

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

If the gravitational force between two masses is F, then by what factor would the distance between the two object need to change if the mass of one of the objects is doubled in order for the force to remain the same?

• 4

• 2

• 2^1/2

• 6^1/2

Tags

NGSS.HS-PS2-4

Two forces are acting on an object; a horizontal force of 8.3 Newtons and a vertical force of 5.4 Newtons. The magnitude of the resultant force is about:

• 13.7 Newtons

• 2.9 Newtons

• 9.9 Newtons

• 6.3 Newtons

Tags

NGSS.MS-PS2-2

The sum of the kinetic and potential energy in a system is known as the system's _____________________ energy.

• mechanical

• chemical

• thermal

• combined

Tags

NGSS.MS-PS3-4