Unit 2: Newton's first law of motion-inertia

according to Galileo, inertia is best described as:

A property of all matter to resist changes in motion.

A box is pulled to the north with a force of 60 N and to the East with a force of 80 N. What is the magnitude of the resultant force on the box?

100 N

Define inertia in the context of newton’s first law of motion.

Objects will remain at rest or keep moving in a straight line at a constant speed unless an external force acts upon them.

If the gravitational force between the sun and the earth suddenly vanished, how would Earth’s motion be affected, according to Newton’s First law?

The earth would continue to move in a straight line at a constant speed. Without the suns gravitational pull, the earth will not orbit the sun.

If gravity between the sun and Earth suddenly vanished, Earth would continue moving in a ____

Straight line at a constant speed.

Which has greater inertia: a bowling ball or a soccer ball? Explain you answer based on Newton’s first law

-The more mass an object has the more inertia it needs.

-The bowling ball because it has more mass.

A box is resting on a horizontal surface.A force of 25 N applied to the right, but a frictional force of 5 N opposes the motion. According to Newton's first law, what will happen to the box?

The box will move to the right with a net force of 20 N.

The classic ‘tablecloth trick’, where a tablecloth is quickly pulled from under dishes without disturbing them, demonstrates:

Inertia of the dishes

The net force on any object in equilibrium is___

0

Galileo’s experiments with rolling balls led him to conclude that an object, once in motion, will

Keep rolling without slowing down of no friction acts upon it.

Galileo’s said that if you rolled a ball along a level surface it would

Continue rolling

According to Galileo, inertia is a____

property of matter to resist changes in motion.

A 5.0 kg object is suspended from a rope. What is the tension in the rope? ( Assume g= 10 m/s² )

T = 50 N

Explain why passenger in a bus tend to move forward when the bus suddenly stops, based on Newton’s First Law.

Due to their inertia, the passengers tend to maintain their state of motion and continue moving forward at the bus’s original speed, leading to the sensation of being thrown forward. They will only stop when external force, acts upon them.

What is the net force on an object in equilibrium, and what does this imply about the object’s motion? Express this mathematically.

The net force is 0

• This means that the objects motion is either at rest or moving at a constant velocity.

If the gravitational force between the sun and Earth suddenly disappeared, Earth would:

Move in a straight line path tangent to its orbit.

The tendency of an object to resist changes in its state motion is called___

Inertia

How did Galileo’s experiments challenge Aristotle’s views on motion?

By providing experimental evidence that

1. Objects of different weights fall to the ground at the same rate in the absence of air resistance.

2. A moving object need no force to keep it moving in the absence of friction.

A car with the mass of 1500 kg is parked on a level road. What is the magnitude of the normal force acting on the car? ( assume g = 10 m/s² )

15000N

Explain how the classic tablecloth trick ( pulling a tablecloth out from under dishes) demonstrates Newtons first law.

-The dishes remain at rest due to inertia.

-There is less to no friction acting upon the dishes.