Equilibrium and Inertia DOL

What does Newton’s first law state?

• A body at rest tends to remain at rest and a body in motion tends to remain in motion at a constant acceleration unless acted on by a net external force.

• A body at rest tends to remain at rest and a body in motion tends to remain in motion at a constant velocity unless acted on by a net external force.

• The rate of change of momentum of a body is directly proportional to the external force applied to the body.

• The rate of change of momentum of a body is inversely proportional to the external force applied to the body.

According to Newton’s first law, a body in motion tends to remain in motion. However, when you slide an object across a surface, the object eventually slows down and stops. Why?

• The object experiences a frictional force exerted by the surface, which opposes its motion.

• The object experiences the gravitational force exerted by Earth, which opposes its motion.

• The object experiences an internal force exerted by the body itself, which opposes its motion.

• The object experiences a pseudo-force from the body in motion, which opposes its motion.

Tags

NGSS.MS-PS2-2

What is inertia?

• Inertia is an object’s tendency to maintain its mass.

• Inertia is an object’s tendency to remain at rest only.

• Inertia is an object’s tendency to remain in motion only.

• Inertia is an object’s tendency to remain at rest or, if moving, to remain in motion.

A force diagram showing a person pushing a box is shown below. What is the net force?

• -110 N

• +110N

• +170N

• +240N

Tags

NGSS.MS-PS2-2

According to the free-body diagram shown, what is the net force acting on the hot air balloon?

• 0 N

• 570 N to the Right

• 570 to the Left

• 5120 N upwards