Work, Energy and Momentum

Calculate work: A 100 Newton force is applied to move a 15 kg object a distance of 5 meters?

• 20 Joules
• 75 Joules
• 500 Joules
• 1500 J

State whether or not the following represent examples of work: A person applies force to a wall.

• Work is done, person uses energy
• Work is done, the wall is moved
• No work is done, wall is not moved
• All of the above

What is the correct unit for the quantity of power?

• Joules
• Watts
• Newtons
• Newton Meters

A scholar climbs up 8 m of stairs while using 500 J of work in 10 seconds. What is their power?

• 5 Watts
• 50 Watts
• 500 Watts
• 5,000 watts

An escalator pushes a student with 490 N of force a distance of 5 m in 10 s. What is the power?

• 4.9 Watts
• 2450 Watts
• 490 Watts
• 245 Watts

A bowler lifts a  ball a distance of 0.5 m using 35 J of energy. What is the mass of the ball?

• 3 kg
• 7kg
• 35 kg
• none of the above

Tags

NGSS.HS-PS3-1

As a car is slowed, most of its kinetic energy is converted by the brakes into what energy?

• Thermal Energy
• Kinetic Energy
• Potential Energy
• Chemical Energy

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

Power is defined as the

• force on an object times the distance the object moves.
• force on an object divided by the time the force acts.
• work done times the time taken to do that work.
• work done on an object divided by the time to do the work

The amount of potential energy possessed by an elevated object is equal to

• the value of the acceleration due to gravity.
•  the power used to lift it.
• the distance it is lifted.
• the work done in lifting it.

Which requires more work: lifting a 70-kg sack  2 meters or lifting a 10-kg sack  14 meters?

• Lifting the 70kg sack
• Lifting the 10kg sack
• Both require the same amount of work.