Force, Motion, and Gravity

On Earth, the force of gravity, which is an attractive force, is directed towards ________.

• The sky

• The center of the Earth

• The moon

• Outward in all directions

Which of the following can increase the amount of friction between objects?

• Polishing the surfaces

• Adding lubrication

• Making the surfaces rougher

• Using wheels

Which of the following can decrease the amount of friction between objects?

• Adding sand between the surfaces

• Making the surfaces smoother

• Increasing the weight of the objects

• Using a rough surface

What are the two variables that determine the amount of gravitational attraction between two objects?

• Mass and temperature

• Mass and distance

• Volume and distance

• Weight and height

Tags

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Which objects will have the greatest gravity between them: objects 10 feet apart or 3 feet apart?

• 10 feet apart

• 3 feet apart

• The distance does not affect gravity

• They will have the same gravity

Which objects will have a greater gravitational pull: objects that are 6 kilograms or objects that are 20 kilograms?

• 6 kilograms

• 20 kilograms

• They will have the same gravitational pull

• The mass does not affect gravity

Tags

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What is the effect of gravity on a feather, a tennis ball, and a block of wood all falling from a high shelf in the room?

• They will float

• They will fall at different speeds

• They will fall at the same speed/rate.

• Gravity does not affect them

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Based on the pattern of the ball's bounces shown in the table, what will be the height reached by the ball in the fourth bounce?

• 3 centimeters

• less than 6 centimeters

• 6 centimeters

• 1.5 centimeters

Tags

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What pattern do you see in the chart related to the size of the force used to push the car and the time it takes for the car to reach the end of the track?

• As the force increases, the time to reach the end of the track increases.

• As the force increases, the time to reach the end of the track decreases./ the faster the car goes.

• The force has no effect on the time to reach the end of the track.

• As the force decreases, the time to reach the end of the track decreases.

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What can cause a person to jump further in a long jump event?

• Less force applied during the jump

• More force applied, by running faster, before the jump

• Jumping with both feet together

• Jumping without bending the knees

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