Science 9 Unit 3: Work and Energy

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 
• It measures how much force is applied over a certain distance

• It measures the change in an object's rate of speed
• It measures how much time it takes to move a massive object

You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?

• The mass of the box
• The slope of the ramp 
• The direction the box moved
• How long the task took

Work divided by time equals...

• potential energy

• power
• kinetic energy

The unit of work is the ...

• joule
• watt

• Newton

• pound

The unit of power is the...

• Joule

• watt
• Newton

• pound

Force multiplied by distance equals...

• work
• power
• potential energy

• kinetic energy

Work is done on an object when the object moves in the SAME direction in which the force is applied.

• True
• False

The FARTHER you move an object, the more work you do.

• True
• False

Work is done when a weightlifter holds a barbell still above his head.

• True
• False

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

• Yes, work was done

• No, work wasn't done