Forces and Motion

A force is best defined as ---

• the application of weight

• a push or pull that is exerted on matter

• the flow of electric charges

• a bond in which electrons are shared

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To make an object move you must first apply ---

• an opposing force

• an unbalanced force

• a stationary force

• a vertical force

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Ana pushed on a big rock in her back yard. She was unable to get it to move because she did not -

• apply enough force

• have a good grip on the rock

• have enough mass

• weigh enough

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Many bicycles use a hand brake to control their speed. When the brake is engaged, a rubber pad presses against the tire. What force of motion does the hand brake rely upon to slow the bicycle?

• Gravity

• Friction

• Electricity

• Magnetism

Combining all forces acting on an object is called

• acceleration.

• inertia.

• net force.

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If forces are in the same direction you add all forces together and if they are in opposite directions you will subtract the smaller force from the larger force.

• True

• False

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John and his son are applying forces to move a box, as shown.

What are the magnitude and direction of the net force?

• 3 N towards the east

• 3 N towards the west

• 9 N towards the east

• 9 N towards the west

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What is GRAVITY?

• A force that pushes all objects away.

• A force that attracts all objects toward one another.

• A force that creates magnetic fields.

• The force of electrons spinning in a certain direction.

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The three examples pictured are of

• Field Forces

• Contact Forces

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Static electricity is a...

• Contact Force

• Field Force

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