Physics Ch 3 Review

What is the equation for Kinetic Energy

• K=1/2 mv²

• K=Fd

• K=1/2 kx²

• K=mgh

What is the equation for Work?

• W=1/2 mv²

• W=Fd

• W=1/2 kx²

• W=mgh

What is the equation for Gravtiational Potential Energy

• GPE=1/2 mv²

• GPE=Fd

• GPE=1/2 kx²

• GPE=mgh

A 10 kg box is pulled a distance of 3m by a force of 30 N.

The work done is

• 9 J

• 30 J

• 90 J

• 900 J

A joule is a unit of

• power

• heat

• energy

• current

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her increase in gravitational potential energy (work) is:

• 1 600 N

• 1 600 J

• 1 600 W

• 2 000 J

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

• 320 W

• 400 W

• 500 W

• 2 000 W

What are the initial and final energy types for the release of an arrow form a bow?

• chemical to potential

• kinetic to sound

• potential to kinetic

• kinetic to heat

What are the initial and final energy types of a falling stone

• chemical to potential

• kinetic to sound

• potential to kinetic

• kinetic to heat

Which of the following statement is true about work?

• Work changes the energy in a system.

• A Watt is the standard metric unit of work.

• Work is dependent on how fast a force moves an object.

• Work is always positive.