• Work
• Time
• Force
• All of above
• #### 2.  When you rub your hands together on a cold day, you use friction to convert

• Mechanical energy into thermal energy
• Thermal energy into nuclear energy
• Chemical energy into mechanical energy.
• Electrical energy into thermal energy

• 600 J
• 450 J
• 900 J
• 1200 J

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

• A
• B
• C
• D
• #### 6.  The amount by which a machine multiplies input force is known as the

• work.
• power.
• output force.
• mechanical advantage.
• #### 7.  A student with a mass of 62 kg walks up a flight of stairs with a height of 3.4 meters. How can he decrease his power?

• walk slower
• walk faster
• carry his friends books
• All of above
• #### 8.  Simple machines make work easier by increasing what?

• The distance over which work is done
• The force needed to do work
• The time required to do work
• The acceleration of a massive object
• #### 9.  This is energy that is stored for later use.

• kinetic energy
• potential energy
• mechanical energy
• radiant energy
• #### 10.  What type of simple machine is a bike pedal?

• Inclined Plane
• Pulley
• Wedge
• Lever
• #### 11.  Light is an example of _________

• thermal energy
• radiant energy
• mechanical energy
• nuclear energy

• 10 m
• 30 m
• 307200000 m
• 300 m
• #### 13.  Where is the roller coaster gaining potential energy?

• A to B
• B to C
• C to D
• The roller coaster is always losing potential energy
• #### 14.  What effect do external forces like an applied force, friction force, or drag force have?

• They have no effect on a system's mechanical energy.
• They convert kinetic energy into potential energy.
• They convert potential energy into kinetic energy.
• They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.

• A
• B
• C
• D
• #### 16.  A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

• The block did not go as high on the other side because gravity pulls down.
• The block did not go as high on the other side because potential energy always has to decrease.
• The block did not go as high on the other side because work from friction made the mechanical energy less.
• The situation as described is impossible to happen.

• Kinetic
• Potential

• energy
• force
• power
• work
• #### 19.  Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

• The marble that rolled down the ramp is moving faster than the marble that fell.
• The marble that fell down the back of the ramp is moving faster than the marble that rolled.
• The marble that rolled down the ramp is not moving when it reaches the ground.
• The two marbles are moving with the same speed.
• #### 20.  How does conservation of energy explain why something that is falling should speed up?

• It gains kinetic energy because it gains potential energy.
• It loses kinetic energy because no work was done on it.
• It gains kinetic energy because it loses potential energy.
• It loses kinetic energy because the Earth gains potential energy.

• Lever
• Gear
• Wedge
• Pulley

• 100,000 J
• 10,000 J
• 10 J
• 1,000,000 J

• speed
• position
• direction
• temperature
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