Forces and Motion

Which of the following forces allows ships to float despite their size and weights?

• buoyant force

• friction force

• normal force

• spring force

Which of these is the effect of force on objects?

• change direction

• stops motion

• starts motion

• all mentioned

Which of the following prevents vehicular accidents on road intersections?

• applying force on the horns

• applying for on the gas pedal

• applying force on the accelerator

• applying force on the brake lever

Which of the following best describes a free body diagram?

• A diagram showing only the object's velocity.

• A diagram that only shows the object's shape and size.

• A diagram that illustrates the object's motion without any forces.

• A diagram showing all forces acting on an object, including both external and internal forces.

Which of these likely exert more applied force?

• A, because it pushed a round

• B, because it has two wheels

• A, because it pushed a round object in a flat area

• B, because it pushed a heavier object in an inclined plane

A book is sitting at rest on a table. Which forces are acting on the book?

• only the normal force upward

• only the gravitational force downward

• gravitational force downward and normal force upward

• gravitational force, normal force, and frictional force to the right

Sarah is standing on a hill, holding a metal spoon in her hand. She suddenly drops the spoon, and it falls straight down to the ground. Which non-contact force is responsible for the spoon falling?

• electrostatic force

• gravitational force

• magnetic force

• nuclear force

What is the purpose of a free body diagram in physics?

• To find the object's velocity.

• To calculate the object's density.

• To visualize the object's appearance.

• To show the forces acting on an object and determine its motion.

Which of these describe an unbalance force?

• It has a net force of zero.

• It pulls object downwards.

• It has a net force that is not zero.

• It enables the object to resist other acted forces.

An object is acted upon by a 20N gravitational force downwards and 20N upward friction force. What is its Net force?

• 0

• 20 N

• 40

• 40 N