Unit 4 Review

Front

What is the normal force and how does it relate to applied forces at an angle?

Back

The normal force is the force exerted by a surface to support the weight of an object resting on it. When an applied force is at an angle, it can affect the normal force; if the force is directed upwards, the normal force decreases, and if directed downwards, it increases.

Front

What is the relationship between net force and motion?

Back

Net force is the vector sum of all forces acting on an object. If the net force is zero, the object remains at rest or continues to move at a constant velocity. If there is a net force, the object will accelerate in the direction of the net force.

Front

What happens to an object in motion when no net force acts on it?

Back

An object in motion will continue to move at a constant velocity if no net force acts on it, according to Newton's first law of motion.

Front

Explain the concept of inertia in relation to a book resting on a table.

Back

Inertia is the tendency of an object to resist changes in its state of motion. A book at rest on a table will remain at rest due to its inertia, as there is no net force acting on it.

Front

What is the significance of a net force being zero on a hockey puck sliding on ice?

Back

When a hockey puck slides on ice at constant velocity, the net force acting on it is zero, indicating that the forces of friction and any other opposing forces are balanced by the applied forces.

Front

Describe the effect of a fly hitting a truck on a frictionless surface.

Back

When a fly hits a truck on a frictionless surface, the truck will accelerate backward due to the conservation of momentum, even though the fly's mass is negligible compared to the truck's.

Front

What is the formula for calculating net force?

Back

Net force (F_net) can be calculated using the formula: F_net = F_applied - F_friction - F_other, where F_applied is the total applied force, and F_friction and F_other are the opposing forces.

Front

How does the angle of applied force affect the normal force?

Back

The angle of the applied force affects the normal force by changing the vertical component of the applied force. A force applied at an angle can either increase or decrease the normal force depending on its direction.

Front

What is the principle of action and reaction as stated in Newton's third law?

Back

Newton's third law states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs; when one object exerts a force on another, the second object exerts an equal and opposite force back.

Front

Define friction and its role in motion.

Back

Friction is the force that opposes the relative motion of two surfaces in contact. It plays a crucial role in motion by either enabling movement (by providing grip) or resisting it (by slowing down or stopping motion).