Mechanics

What is needed to calculate work?

• time and distance

• speed and distance

• force and direction

• acceleration and velocity

Is this an example of work?

• Yes

• No

Tags

NGSS.MS-PS3-5

What is the unit of measurement for work?

• meters

• newtons

• m/s

• Joules

Is this an example of work?

• Yes

• No!

Tags

NGSS.MS-PS3-5

How many joules of work are done against a cart when a force of 50 N pushes it 1 kilometer away?

• 7000 J
• 5000 J
• 5500 J
• 6600 J

What is the Force equation?
W= 

• F * d * cos(θ)
• m * a
• d / V
• F/ d * cos(θ)

Tags

NGSS.HS-PS2-1

In a tug of war, team x pulled team y with a force of 10000 N a distance of 50 meters. Team y did not win because they were only able to exert of force of 8000 N. Calculate the work for team x.

• 5.0 x 10⁵
• 5.0 x 10^-5
• 5.3 x 10⁴
• 5.3 x 10^-4

Work is

• having a job

• movement

• energy transfer

• energy transfer to an object

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

How much work is done on the lawn mower by the person in the picture if he exerts a constant force of 75.0N at an angle 35º below the horizontal and pushes the mower 25.0m on level ground?

• 1875 J

• 2625 J

• 65600 J

• 1536 J