Understanding Forces and Friction

What is the definition of force?

• A type of energy

• A push or a pull on an object

• A measure of mass

• A type of motion

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NGSS.MS-PS2-2

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NGSS.MS-PS2-5

The unit of measurement for force is (a)  

• Joule
• Watt
• Newton
• Pascal

Which of the following describes balanced forces?

• The net force is zero, resulting in no change in motion

• The net force is not zero, causing acceleration

• Forces that cause an object to move in a circle

• Forces that only act on stationary objects

What happens to an object when unbalanced forces act on it?

• It remains stationary

• It accelerates in the direction of the greatest force

• It decelerates

• It moves in a circular path

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NGSS.MS-PS2-2

(a)   prevents an object from moving when a force is applied.

• Sliding friction
• Rolling friction
• Static friction
• Fluid friction

(a)   occurs when two solid surfaces slide past each other.

• Static friction
• Sliding friction
• Rolling friction
• Fluid friction

The type of friction responsible for slowing down a rolling soccer ball on grass is (a)   .

• Static friction
• Sliding friction
• Rolling friction
• Fluid friction

How does surface texture affect friction?

• Smoother surfaces create more friction

• Rougher surfaces create more friction

• Surface texture has no effect on friction

• Only liquid surfaces affect friction

What effect does increasing the force between surfaces have on friction?

• It decreases friction

• It increases friction

• It has no effect on friction

• It changes the type of friction

Calculate the net force if two forces of 5 N and 10 N act in the same direction on an object.

(a)  

• 5 N
• 10 N
• 15 N
• 20 N

Tags

NGSS.MS-PS2-2