Unit 5: Work and Energy

In which scenario is work = 0 J ?

• Pushing a stationary wall

• Pulling a trolley car

• Pushing a book across the table

• Dropping a set of keys from a height, h.

Work is zero if the force has a component in the direction opposite of motion.

• True

• False

If the net work done on an object is positive, what can you conclude about the object's motion?

• The object is speeding up.

• The object is moving with a constant velocity.

• The object is slowing down.

• The object is at rest; its position is constant.

Tags

NGSS.HS-PS2-1

Stored energy in the form of position or condition.

• potential energy

• kinetic energy

• momentum

• mechanical energy

Tags

NGSS.MS-PS3-2

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

What type of energy is in this picture?

• Kinetic
• Potential
• Chemical
• Sound

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

The SI Unit for Energy is

• Joule

• Newton

• Calorie

• Watt

Definition of work energy theorem is, the work done by the nett force on a body equals to the _________________________________

• change in the body’s elestic energy

• change in the body’s kinetic energy

• change in the body’s gravitational energy

• change in the body’s potential energy

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task
• Work takes into account the time it takes to complete a task
• Power is force/area
• Work is force/area

Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 

• True
• False