(Savvas 14.1) Ch. 14: Work, Power, and Machines

In science, work is done when a(n) _______________ acts on an object in the direction the object moves.

• force

• mass

• temperature

• pressure

Tags

NGSS.HS-PS2-1

Why isn’t work being done on a barbell when a weight lifter is holding the barbell over his head?

• Because the barbell is not moving

• Because the weight lifter is not applying force

• Because the barbell is weightless

• Because the weight lifter is not strong enough

Is the following sentence true or false? A vertical force does work on an object that is moving in a horizontal direction. True or False.

• True

• False

In science, work that is done on an object can be described as the force acting on the object multiplied by the _______________.

• distance

• time

• mass

• velocity

Tags

NGSS.HS-PS2-1

Choose the correct form of the work equation to use when determining the distance an object moves as a result of a force applied to it.

• Distance = Force × Work

• Distance = Force/Work

• Distance = (Force)²

• Distance = Work/Force

The SI unit of work is the _________________

• joule

• newton

• watt

• pascal

Circle the letter of the amount of work done when a 1 newton force moves an object 1 meter.

• 1 newton per second

• 1 joule

• 1 watt

• 1 newton per meter

Tags

NGSS.HS-PS2-1

Is the following sentence true or false? Power is the rate of doing work.

• True

• False

In order to do work faster, more ________________ is required.

• more power is required.

• less power is required.

• time is used.

• energy is conserved.

Choose each sentence that is true about power.

• Power and work are always equal.

• You can increase power by doing a given amount of work in a shorter period of time.

• When you decrease the force acting on an object, the power increases.

• When you do less work in a given time period, the power decreases.