Chapter 6.1 Physical Science

_____ is the transfer of energy that occurs when a force makes an object move.

• Effort

• Resistance

• Power

• Work

When work is done, there is always a(n) _____ .

• constant rate

• single movement involved

• transfer of energy

• increase in the mechanical advantage

Match the following equations with their correct formulas for calculating work done.

• Work done is the product of mass and distance.

• W = F/d

• Work done is the product of force and distance.

• W = F x d

• Work done is the force divided by distance.

• W = m x d

• Work done is the product of force and acceleration.

• W = F x a

You apply a force of 18 N to a dresser and move it 3 m. The work done on the dresser is (a)  

• 54 J
• 6 J
• 21 J
• 27 J

(a)   is the rate at which work is done.

• Force
• Effort
• Power
• Efficiency

Which of the following equations should be used to calculate power?

• P = W x t

• P = W/t

• P = F/t

• P = m x a

Power is measured in __________.

• joules

• newtons

• watts

• m/s

A watt is equal to __________.

• one newton-meter

• one meter per second

• one newton per second

• one joule per second

Which of the following equations should be used to calculate power if work is not done?

• P = E x t

• P = E/t

• P = F/t

• Power cannot be measured if work is not done.

If you apply a force of 10 N to a box and push it 10 m in 10 s, how much power did you deliver?

• 30 W

• 1 000 W

• 10 W

• 100 W