Pretest SKB Dosen 2023

What do we mean by dynamics in the context of physics?

• The study of the movement of objects and the forces that cause them.

• The study of stationary bodies and their internal structures.

• The study of the potential and kinetic energy of a system.

• The study of elastic deformation of objects and their reactions.

What is the normal force?

• The force that acts on an object moving in a circle.

• The force that prevents vertical movement of an object.

• The force exerted by a surface that supports an object.

• The force responsible for the change in velocity of an object.

Explain the difference between mass and weight of an object.

• Mass and weight have the same meaning in the context of physics.

• Mass is the force exerted by gravity on an object, while weight is the amount of matter in the object.

• Mass and weight are not related to each other in the context of physics.

• Mass is the amount of matter in an object, while weight is the force exerted by gravity on the object.

The statement that best fits Newton's Third Law is:

• If an object is moving with constant speed, the force acting on it must be zero.

• Every action has an equal and opposite reaction.

• A force exerted on an object will change the mass of the object

• The acceleration of an object is proportional to the net force acting on it.

Newton's First Law (Law of Inertia) states that:

• Any body will remain at rest if the force acting on it is zero.

• Any body will remain in motion with constant velocity if the force acting on it is zero.

• An object will remain at rest or move in a straight line if the force acting on it is zero.

• The force acting on an object is proportional to its acceleration.

Why does one feel a backward push when pressing the gas pedal of a car?

• Because of the gravitational force acting on the car.

• Because of the frictional force between the car tires and the road surface.

• Because of Newton's Third Law, where every action has an equal and opposite reaction.

• Because of Newton's First Law, where every object will remain at rest if the force acting on it is zero.