Force - Final Review

1. Moving objects eventually come to a stop on Earth because of:

• Gravity

• Friction

• Magnetism

• Electricity

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What causes objects to move in certain directions?

• Friction

• Gravity

• Unbalanced Force

• Mass

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If the same amount of force was applied to each of these cars, which one would accelerate faster and why?

• The car that does not have the luggage on the roof will accelerate faster because it has less weight (mass) to move.

• The car that has the luggage on the roof would accelerate faster because it has more weight (mass) to move.

• Both cars would accelerate at the same rate.

• Neither car would accelerate.

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What is the purpose of a seat belt in a car or bus?

• Applies a force in the opposite direction of the motion of the car to keep the person in their seat.

• To make the seat more comfortable for the passenger.

• To help the driver find the right speed.

• To decorate the interior of the vehicle.

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Hockey is a sport in which players use hockey sticks to push a puck across smooth ice. At practice one day, two different-colored hockey pucks were sliding on the ice. The black and purple hockey pucks have the same mass. A player hit each hockey puck with a stick, but not from the same direction. Which puck experienced the stronger force when hit?

• The black puck experienced stronger force.

• The purple puck experienced stronger force.

• Both experienced the same force because they were the same mass and changed speed by same amount.

• Cannot be determined from the information given.

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Which of the following ramps would be hardest to push the box up? Why?

• Box with wheels being pushed up a Smooth Surface because the wheels would create the most friction with the smooth surface.

• Box without wheels being pushed up a Smooth Surface because the surface would create the most friction with the bottom of the box.

• Box with wheels being pushed up a Rough Surface because the wheels would create the most friction with the rough surface.

• Box without wheels being pushed up a Rough Surface because the surface would create the most friction with the bottom of the box.

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A car at the top of which hill, A or B, would have the most potential energy and why? (Refer to the diagram of the roller coaster with hills A and B.)

• The roller coaster car would have the greater amount of potential energy at the top of hill A because it is higher than hill B and will therefore have more potential gravitational energy (potential energy based on height above the ground).

• The roller coaster car would have the greater amount of potential energy at the top of hill B because it is lower than hill A and will therefore have more potential gravitational energy.

• The roller coaster car would have the same amount of potential energy at the top of both hills because potential energy does not depend on height.

• The roller coaster car would have more potential energy at the bottom of the hills because potential energy increases as the car moves downward.

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