1st 9 Weeks Exam Review

Which of the following has kinetic energy?

• a bowling ball rolling down the lane

• an archer's bow that is drawn back

• an apple sitting in a tree

• roller coaster cart at the top of a hill

When you rub your hands together on a cold day, you use friction to convert ___.

• chemical energy to electrical energy

• nuclear energy to electrical energy

• magnetic energy to nuclear energy

• mechanical energy to thermal energy

Two forces act in opposite directions on a wood block. What will happen if the forces are unbalanced?

• The mass of the block will change.

• The block will balance the forces.

• The position of the block will change.

• The forces will reverse direction.

What is the difference between potential energy and kinetic energy?

• Potential energy is the energy stored after an applied force, while kinetic energy is the energy used from the applied force.

• Potential energy is the energy of an object due to an applied force, while kinetic energy is energy stored after the applied force.

• Potential energy is the energy of an object due to its motion, while kinetic energy is energy due to its position

• Potential energy is the energy of an object due to its position, while kinetic energy is energy due to its motion.

Marty rubbed a balloon on his shirt. The balloon was then able to stick to the wall of the room. Which picture best represents the charges of the particles on the balloon and the wall that cause the balloon to be attracted to the wall?

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During a collision, a seat belt slows the speed of a crash dummy. What is the direction of the net force exerted by the seat belt compared to the direction of the crash dummy’s motion?

• in a vertical direction

• in the same direction

• in the opposite direction

• in a downward direction

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Tires from a car on the road

• Tread on the bottom of your shoes

• All are examples that are helpful

A ball rolls across the floor and slows down to a stop. Which force caused the ball to slow down?

• magnetic

• friction

• inertia

• gravity

A roller coaster is climbing up the highest hill on its track. At which point will the front car of the coaster most likely have its greatest potential energy?

• at the bottom of the highest hill

• at the start of the track

• at the top of the highest hill

• at the end of the track

Which best represents the use of mechanical energy?

• a candle providing light

• a light bulb giving off heat

• a can rusting

• a nail being hammered