Work and Power

Work and Power

Work

A force applied to an object over a set distance

Work Formula

Work is found by multiplying Force and distance

Multiple Choice

If the object does not move then what is happening

• nothing

• work

• power

• no work is being done on the object

Multiple Choice

The ( ) the force the ( ) work is done

• less, more

• smaller, more

• bigger, more

• bigger, less

Power

Power is the rate at which something does work over a period of time

Power Formula

Power is found by dividing by Work done by the time taken

Work and Power

Multiple Choice

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts
• 3 watts
• 120 watts
• 270 watts

Multiple Choice

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

• 2.23 W

• 6.03 W

• 17.4 W

• 278.7 W

Multiple Choice

Which of the following would produce the most power?

• A mass of 10 kilograms lifted 10 meters in 10 seconds 
• A mass of 10 kilograms lifted 10 meters in 5 seconds
• A mass of 5 kilograms lifted 10 meters in 5 seconds
• A mass of 5 kilograms lifted 5 meters in 10 seconds

Multiple Choice

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

• 160 watts
• 10 watts
• 6.4 watts
• 17 watts