Unit 8- Forces

Which of the following graphs best represents an object moving at a constant speed?

• A straight line with a positive slope

• A curved line

• A horizontal line

• A straight line with a negative slope

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Describe how you would measure the distance and time for an object moving at a constant speed in a classroom experiment.

• Use a stopwatch and a ruler

• Use a thermometer and a scale

• Use a compass and a protractor

• Use a barometer and a hygrometer

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Which of the following is a contact force?

• Gravitational force

• Magnetic force

• Frictional force

• Electrical force

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Explain how magnetic force can act at a distance.

• By direct contact between objects

• Through the air without touching

• By using a liquid medium

• By using a solid medium

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Plan an experiment to demonstrate the effect of gravitational force between two objects.

• Use a magnet and a paperclip

• Use two masses and a spring scale

• Use a balloon and static electricity

• Use a thermometer and a beaker of water

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Which factor does NOT affect the gravitational force between two objects?

• The mass of the objects

• The distance between the objects

• The color of the objects

• The shape of the objects

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Explain how the mass of two objects affects the gravitational force between them.

• Greater mass results in a weaker force

• Greater mass results in a stronger force

• Mass does not affect gravitational force

• Mass affects only one of the objects

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What is the result of an unbalanced force acting on an object?

• The object remains at rest

• The object changes its speed or direction

• The object becomes heavier

• The object becomes lighter

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Which of the following scenarios involves an unbalanced force?

• A book resting on a table

• A car accelerating on a highway

• A satellite orbiting Earth at constant speed

• A pendulum at its highest point

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Design a simple experiment to show how an unbalanced force can change the direction of an object.

• Use a ball and a ramp

• Use a thermometer and a beaker

• Use a magnet and a paperclip

• Use a ruler and a compass

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