Forces and Motion in Physics

In physics, what does the term "body" refer to?

• Only human beings.

• Any person, animal, or object.

• Only living organisms.

• Objects of a specific size.

When is a body considered to be "at rest" in physics?

• When all its parts are completely motionless.

• When it is staying in the same location.

• When it is moving at a very slow speed.

• When it is actively engaged in an activity but not changing overall position.

What is a force in physics?

• The speed at which an object moves.

• Something that, if unopposed, can change a body's velocity.

• The direction an object is moving.

• The amount of energy an object possesses.

When are forces acting on a body considered balanced?

• When the body's speed is increasing.

• When the body's direction is changing.

• When the body's velocity is constant.

• When the body is accelerating.

What happens to a body when it is acted upon by balanced forces and its velocity is zero?

• Its velocity increases.

• Its velocity decreases.

• It remains at rest.

• It changes direction.

A boat is moving at a constant velocity of 30 miles per hour. If its engines are pushing it forward with 5000 pounds of force, what can be said about the opposing forces?

• The opposing forces are less than 5000 pounds.

• The opposing forces are greater than 5000 pounds.

• The opposing forces are exactly 5000 pounds.

• The opposing forces are irrelevant to constant velocity.

A person jumps off a cliff. Initially, their downward velocity increases. What does this indicate about the forces acting on them?

• The upward air resistance is greater than the downward force of gravity.

• The downward force of gravity is greater than the upward air resistance.

• The upward air resistance and downward force of gravity are balanced.

• There are no forces acting on the person.

A skydiver deploys their parachute. What happens to their velocity immediately after deployment?

• Their velocity increases rapidly.

• Their velocity remains constant.

• Their velocity decreases due to increased air resistance.

• They immediately stop falling.