8th Grade Force and Motion - Mock STAAR Review

Front

What is net force?

Back

The net force is the overall force acting on an object when all the individual forces are combined. It determines the object's acceleration and direction of motion.

Front

What does it mean if forces are unbalanced?

Back

Unbalanced forces result in a change in motion of an object. This means that the net force acting on the object is not zero, causing it to accelerate in the direction of the greater force.

Front

How do you calculate acceleration?

Back

Acceleration can be calculated using the formula: a = F/m, where 'a' is acceleration, 'F' is the net force, 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 greater the mass of an object, the less acceleration it will have for a given force. This means that lighter objects accelerate more than heavier ones when the same force is applied.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object. It acts in the opposite direction to the movement and can affect the net force acting on an object.

Front

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

Back

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

Front

What is the formula for calculating net force?

Back

Net force can be calculated by summing all the individual forces acting on an object: F_net = F1 + F2 + ... + Fn.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion. The more mass an object has, the greater its inertia.

Front

What is the effect of gravity on falling objects?

Back

Gravity causes all objects to accelerate downwards at approximately 9.8 m/s², regardless of their mass, unless other forces (like air resistance) act on them.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, measured in kilograms (kg), while weight is the force exerted by gravity on that mass, measured in newtons (N). Weight can change depending on the gravitational field.