Physical Science Spring Final

A runner reaches the top of a steep hill and pauses before descending. At this moment, what type of energy is primarily stored in the runner?

• Electrical
• Thermal
• Kinetic
• Potential

What type of energy does an object possess due to its motion?

• Chemical
• Nuclear
• Kinetic
• Potential

Which type of energy is stored in the bonds of molecules and released during a chemical reaction?

• Nuclear
• Chemical
• Thermal
• Gravitational
• Elastic

The SI unit of power is the ___________

• Joule
• Watt
• Einstein
• Kelly

A machine that is comprised of two or more simple machines is called a________ machine?

• Complex
• Compound
• Heavy

Why is no machine ever 100% efficient?

• Friction in the machine transforms some of it's kinetic energy to thermal energy.
• Gravitational potential energy transforms some of the energy to friction
• False machine can able 100% efficient
• Kinetic energy transforms some of the mechanical energy to potential energy.

The SI unit of Work and Energy is the ________

• Watt
• Newton
• Joule
• Einstein

How much work is done when a 35 N force moves a box 3.5 m?

• 12.5 J
• 0.1 J
• 122.5 J
• 10 J

How much force is needed to move a box 6.4 meters if 650 J of work is done?

• 101.6 N
• 4160 N
• .010 N
• 251 N

If you apply 69 N of force and do 950 J while moving a box, then how far will the box have moved?

• .07 m
• 881 m
• 13.8 m
• 65,550 m