TOPIC 7_POWER

Layla pulled a box up a smooth ramp from A to B with a force of 30 N over a distance of 2 m in 5 s. What is the power used by Layla to pulled a box up?

• 12.00 W

• 24.00 W

• 300 W

• 12 W

What is power?

• Ability to do work

• Rate of doing work

• Rate of doing force

• Ability to do force

What is the formula for power?

• Power = Work done/time taken

• Power = Force/time taken

• Power = Energy transferred/time taken

• Power = Time/Work done

What is the standard unit (SI) for POWER?

• Watts

• Joules

• Newtons

• Horseriding

If you do the same work as someone, but you took shorter time to complete the work, it means:

• You are more powerful

• You are less powerful

• You have the same power

If you increase your work and decrease your time, you will have

• more power

• less power

• same amount of power

• power rating can not be determined

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task
• Work takes into account the time it takes to complete a task
• Power is force/area
• Work is force/area

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 3920.00 W

• 980.00 W

• 400.00 W

• 100.00 W

Which requires more power – a person walking up stairs or a person running up stairs?

• walking

• running

• they require equal power output

• no power is required at all

What is the equation used for calculating power from force and velocity

• Power = force/velocity

• Power = force * velocity

• Power = force + velocity

• Power = velocity / force