Intro to Forces

What is a contact force?

• A force that needs two objects touching each other

• A force that does not need the objects to touch to occur

• A force that impacts an object

What will cause an object to move?

• Applied forces

• Balanced forces

• Unbalanced forces

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The force that pulls things towards earth

• Speed

• Gravity

• Normal

• Air resistance

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The unit of force is

• m/s

• m/s²

• Newtons

• kg

Acceleration is

• increasing speed
• decreasing speed
• changing direction
• all of the above

Which type of force(s) will cause a change in an object's motion?

• equal forces
• zero net force
• balanced forces
• unbalanced forces

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A ____ force is the sum of forces felt by an object.

• sum
• net
• strong
• balanced

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What kind(s) of objects have inertia?

• all objects with mass
• only objects at rest
• only objects in motion
• only objects whose motion is being changed

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When two equal forces act in opposite directions on an object, they are called ______________________.

• frictional force

• balanced force

• centripetal force

• gravitational force

The force that opposes motion between two surfaces in contact with each other.

• inertia
• friction
• momentum
• gravity

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