2nd Semester Final Exam Part 1

An ideal machine would have an efficiency of 

• 1%
• 10%
• 50%
• 100%

Pascal’s principle states that when force is applied to a confined fluid, the change in pressure is transmitted 

• only to the area where the pressure is applied. 
• equally to all parts of the fluid
• to any weakness in the fluid’s container. 
• . in the direction of the buoyant force.  

The measure of the upward force applied by a fluid on an object is called: 

• density
• buoyancy
• weight
• volume

An object will sink if...

• its density is equal to that of the substance it’s in 
• its density is less than that of the substance it’s in 
• its density is greater than that of the substance it’s in 
• its density is twice as much as the substance it is in 

The force that pulls falling objects toward Earth is called 

• gravity
• free fall
• acceleration
• air resistance

A simple machine that might be thought of as an inclined plane that moves is a 

• lever
• wheel and axle
• wedge
• pulley

Which of the following is an example of rolling friction?  

• your shoes on a sidewalk as you walk 
• bike tires on the road as you ride 
• a boat on the water as it sails 
• two hands rubbing together 

Which of the following are examples of observations about a soccer ball? 

• they like to play soccer 
• the ball is round 
• They are on a soccer team
• they are good at soccer 

What effect does a buoyant force have on a submerged object? 

• It causes the object to sink in a fluid. 
• It causes a net force acting upward on the object
• It causes the object to float in a fluid. 
• It causes a net force acting downward on the object. 

The average random kinetic energy of atoms or molecules within an object is a measure of the object’s: 

• heat
• temperature
• thermal energy
• specific heat