Understanding Forces and Motion

What is a force?

• A stretch or compression on an object

• A push or a pull on an object

• A mass in motion

• A change in velocity

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

What do all forces have?

• Size and speed

• Strength and motion

• Strength and direction

• Mass and velocity

What is an applied force?

• A force exerted by gravity on an object

• A force created by tension in a rope

• A force applied by a person or object onto another object

• A force created by a spring

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NGSS.MS-PS2-1

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Which of the following is true about applied forces?

• Only one applied force can act on an object at a time

• More than one applied force can act on an object simultaneously

• Applied forces always cause an object to move upward

• Applied forces work against friction

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NGSS.MS-PS2-2

What does friction do?

• Helps objects move faster

• Opposes motion and works in the opposite direction of a moving object

• Pulls objects together

• Balances forces acting on an object

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NGSS.MS-PS2-2

Which statement about parachutes is true?

• Parachutes reduce gravity’s pull on an object

• Parachutes increase buoyancy

• Parachutes are large to "capture" more air resistance, slowing downward movement

• Parachutes work best in a vacuum

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NGSS.MS-PS2-2

Why are parachutes designed to be large?

• To increase gravity

• To “capture” more air resistance

• To decrease the weight of the object

• To increase buoyancy

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NGSS.MS-ETS1-1

What creates tension?

• When a rope, string, wire, or cable is stretched in opposite directions by two objects

• When an object is immersed in water

• When gravity pulls on an object

• When forces are unbalanced

What is the normal force?

• A force exerted by a surface on an object resting on it

• A force created by tension in a cable

• A force pushing upward on an immersed object

• A force applied by a person

What is buoyancy or buoyant force?

• The force that keeps cars stable during motion

• A force that pushes upward on an immersed object

• A force created by a stretched spring

• The gravitational force between two objects