Unit 7 - Part 1

Unit 7 - Part 1

By Tariq Ismail

Multiple Select

Which of the following are required for work to take place

• Force

• Distance

• Cause

• Energy

Multiple Choice

Work is measured in

• Newtons

• Seconds

• $$\frac{m}{s^2}$$  

• Joules

Multiple Choice

Work is a

• Vector

• Scalar

Multiple Choice

Calculate the work performed by a crane lifting a 4000N object a distance of 200m into the air.

• 4000N

• 800000J

• 800000N

• 200J

Multiple Choice

Calculate the work performed by a 5kg mallet if it is accelerated at 3m/s2 for a distance of 1.25m

• 18.75N

• 18.75J

• 5J

• 15J

Multiple Choice

If a halogen light is using 500J every second and LED light is using 200J of energy every 5 seconds, which light is more powerful?

• Halogen Light

• LED Light

Multiple Choice

Calculate the power used by a truck that does 400J of work every 2 seconds (P=W/t)

• 400W

• 2W

• 150W

• 200W

Open Ended

What do machines help us do?

Multiple Choice

Machines can never produce more energy than put in

• True

• False

Multiple Choice

What force reduces the efficiency of a machine?

• Friction

• Gravitiational

• Elastic

• Potential

Multiple Select

What are the two families of simple machines,

• Lever

• Motor

• Elastic

• Inclined plane

Multiple Select

A wheel and axel is part of what simple machine family

• Lever Family

• Inclined Plane Family