Force and motion

How is force commonly described in textbooks?

• A push or pull upon an object.

• An interaction between two objects.

• The cause of acceleration.

• A change in an object's state of motion.

A soccer ball is lying stationary on the ground. Which forces are acting on it?

• Only gravitational force.

• Only normal force.

• Gravitational force and normal force.

• No forces are acting on it.

What condition must be met for an object to change its state of motion (i.e., move from rest or change velocity)?

• The object must be pushed or pulled.

• The net force acting on the object must be non-zero.

• The object must be on a frictionless surface.

• The gravitational force must be greater than the normal force.

A ball is moving at a uniform velocity of 2 m/s on a frictionless floor with no air resistance. What will happen to the ball if no external forces are applied?

• It will eventually stop due to internal resistance.

• It will accelerate.

• It will continue to move at 2 m/s.

• It will change direction.

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