Energy - Concept 4 - Work and Power

What is the definition of work in physics?

• The transfer of energy that occurs when a force makes an object move.

• The energy stored in an object due to its position.

• The rate at which work is done.

• The force applied to an object without causing movement.

Tags

NGSS.HS-PS3-2

Which of the following is a condition for work to be done?

• The object must remain stationary.

• The force must be applied perpendicular to the direction of movement.

• The object must move.

• The force must be applied without any movement.

If a force of 90 N is applied to move an object 35 m, how much work is done?

• 3,150 J

• 3,050 J

• 3,250 J

• 3,100 J

Tags

NGSS.HS-PS3-1

What is the force required to move a 75 kg refrigerator 35 m if the work done is 3,150 J?

• 90 N

• 85 N

• 95 N

• 100 N

Tags

NGSS.HS-PS2-1

What is the work done if a force of 50 N moves an object 10 m?

• 500 J

• 400 J

• 600 J

• 450 J

What happens to the work done if both force and distance are doubled?

• It is quadrupled

• It is doubled

• It remains the same

• It is halved

What is the formula for power?

• P = W + t

• P = W - t

• P = W * t

• P = W/t

In the formula P = W/t, what does 'W' represent?

• Weight

• Work

• Width

• Watt

What is the unit of time in the formula P = W/t?

• Minutes

• Hours

• Seconds

• Days

What unit is used to measure power in this example?

• Watts

• Joules

• Seconds

• Newtons