Free Body Diagrams, Net Force, Static and Kinetic Friction

Which force opposes the motion of an object sliding on a surface?

• Gravitational force

• Normal force

• Kinetic friction

• Tension force

Static friction is usually ______ than kinetic friction.

• greater

• less

• equal

• unrelated

The coefficient of friction is a measure of how much frictional force exists between two surfaces. True or False?

• True

• False

What is weight force?

• The force of gravity on an object

• The force of an object pushing upwards

• The force of friction

• The force of air resistance.

The normal force is ______ to the contacting surface.

• parallel

• perpendicular

• equal

• opposite

Fill in the blank: The surface pushes up with a force called the ______ force.

• Gravitational

• Normal

• Frictional

• Tension

What is a free body diagram?

• A diagram showing all forces acting on an object

• A diagram showing the internal structure of an object

• A diagram showing the velocity of an object

• A diagram showing the temperature of an object

The purpose of a free body diagram is to ______.

• Calculate the mass of an object

• Analyze the forces acting on an object

• Determine the color of an object

• Measure the temperature of an object.

What is the first step in drawing a free body diagram?

• Draw a box to represent the object

• Pick one object/force system to analyse

• Draw an arrow to represent each force

• Make sure the arrow shows the direction and relative size of the force.

Which of the following statements is true about the forces acting on the book?

• They are unbalanced

• They are balanced and cancel each other out

• Only one force is acting

• The forces are equal but not opposite.