8.6A and 8.6C STAAR Practice

Front

What is an unbalanced force?

Back

An unbalanced force is a force that causes an object to accelerate in the direction of the net force acting on it. It occurs when the total forces acting on an object are not equal.

Front

How do you calculate net force?

Back

Net force is calculated by adding all the forces acting on an object, taking into account their direction. If forces are in opposite directions, subtract the smaller force from the larger one.

Front

What is the formula for calculating acceleration?

Back

Acceleration (a) is calculated using the formula: a = F/m, where F is the net force applied to the object and m is the mass of the object.

Front

What is the relationship between mass and acceleration?

Back

According to Newton's second law, the acceleration of an object is inversely proportional to its mass when the same net force is applied. This means that as mass increases, acceleration decreases.

Front

What is the unit of force?

Back

The unit of force is the Newton (N). One Newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared.

Front

What does it mean for an object to have a constant velocity?

Back

An object has a constant velocity when it moves in a straight line at a constant speed, meaning that both its speed and direction remain unchanged.

Front

What is resistive force?

Back

Resistive force is a force that opposes the motion of an object. Examples include friction and air resistance.

Front

How does a duck swimming in a stream demonstrate Newton's third law of motion?

Back

The duck pushes against the water (action), and the water pushes back against the duck with an equal and opposite force (reaction), allowing the duck to move forward.

Front

What is the significance of direction in force?

Back

The direction of a force is crucial because it determines the direction in which an object will accelerate. Forces acting in opposite directions can cancel each other out.

Front

What is the effect of applying a net force on an object?

Back

Applying a net force to an object will cause it to accelerate in the direction of the net force, changing its speed or direction of motion.