Unit 4: Force & Motion

Front

What are balanced forces?

Back

Balanced forces are forces acting on an object that are equal in size and opposite in direction, resulting in no change in motion.

Front

What are unbalanced forces?

Back

Unbalanced forces are forces that cause a change in the motion of an object, resulting in acceleration.

Front

What is the formula to calculate weight?

Back

Weight (W) is calculated using the formula W = m * g, where m is mass in kg and g is the acceleration due to gravity (9.8 m/s² on Earth).

Front

If a student weighs 45 kg, what is their weight in Newtons?

Back

W = 45 kg * 9.8 m/s² = 441 N.

Front

What is net force?

Back

Net force is the total force acting on an object after all the forces are combined.

Front

What unit is used to measure force?

Back

The unit used to measure force is the Newton (N).

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion.

Front

How does mass affect inertia?

Back

The greater the mass of an object, the greater its inertia, meaning it will be harder to change its motion.

Front

What is the relationship between force, mass, and acceleration?

Back

According to Newton's second law, F = m * a, where F is force, m is mass, and a is acceleration.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object, caused by the contact between surfaces.