Post FD Flashcard Review

Front

What is equilibrium in physics?

Back

Equilibrium occurs when the net force acting on an object is zero, resulting in no acceleration. An object at rest or moving at a constant velocity is in equilibrium.

Front

If an object weighs 20 N and is not moving, what can we conclude about the forces acting on it?

Back

The forces acting on the object are balanced, meaning the upward force (normal force) equals the downward force (weight).

Front

What is net force?

Back

Net force is the vector sum of all the forces acting on an object. It determines the object's acceleration according to Newton's second law.

Front

If Kev pulls with 50 N and Adrian pulls with 80 N in opposite directions, what is the net force?

Back

The net force is 30 N in the direction of Adrian's pull (80 N - 50 N = 30 N).

Front

What is the significance of ignoring air resistance when analyzing forces on a flying object?

Back

Ignoring air resistance simplifies the analysis by allowing us to focus solely on the forces acting on the object, such as gravity.

Front

How many forces act on a beach ball thrown through the air, ignoring air resistance?

Back

Only one force acts on the beach ball: the force of gravity.

Front

What is free fall?

Back

Free fall is the motion of an object under the influence of gravity only, with no other forces acting on it.

Front

What force acts on an object in free fall?

Back

The only force acting on an object in free fall is the gravitational force exerted by the Earth.

Front

How many forces are acting on an astronaut floating in space?

Back

There are zero forces acting on the astronaut if we ignore any external influences.

Front

What is the role of gravity in determining the motion of falling objects?

Back

Gravity is the force that pulls objects toward the Earth, causing them to accelerate downwards at approximately 9.81 m/s².