# First Law Of Motion- Inertia

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• 1.

### __________, a premier scientist in the seventeenth century, developed the concept of inertia.

Explanation
Galileo, a premier scientist in the seventeenth century, developed the concept of inertia. This implies that Galileo was a renowned scientist during the seventeenth century and he was the one who introduced the concept of inertia. Inertia is the property of matter that causes it to resist changes in motion. Galileo's work on inertia laid the foundation for Isaac Newton's laws of motion and had a significant impact on the field of physics.

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• 2.

### Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will

• A.

• B.

Continue in motion in the same direction at constant speed.

• C.

Will not move.

• D.

None of the above.

B. Continue in motion in the same direction at constant speed.
Explanation
According to Newton's first law, the rock will continue in motion in the same direction at constant speed.

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• 3.

### Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with?

• A.

Mac

• B.

Tosh

• C.

None of the above.

B. Tosh
Explanation
Tosh is correct. Inertia is that quantity which depends solely upon mass. The more mass, the more inertia. Momentum is another quantity in Physics which depends on both mass and speed. Momentum will be discussed in a later unit.

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• 4.

### Supposing you were in space in a weightless environment, would it require a force to set an object in motion?

• A.

Yes.

• B.

No.

• C.

None of the above.

A. Yes.
Explanation
Absolutely yes!

Even in space objects have mass. And if they have mass, they have inertia. That is, an object in space resists changes in its state of motion. A force must be applied to set a stationary object in motion. Newton's laws rule - everywhere!

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• 5.

### Fred spends most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food. What effect (if any) does this practice have upon his inertia?

• A.

Fred's inertia stays the same!

• B.

Fred's inertia will decrease!

• C.

Fred's inertia will increase!

• D.

None of the above.

C. Fred's inertia will increase!
Explanation
Fred's inertia will increase!

Fred will increase his mass if he makes a habit of this. And if his mass increases, then his inertia increases.

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• 6.

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

Inertia
Explanation
Inertia is the tendency of an object to resist changes in its state of motion. This means that an object at rest will stay at rest, and an object in motion will continue moving at a constant velocity, unless acted upon by an external force. Inertia is a fundamental property of matter and is related to the mass of an object. The greater the mass of an object, the greater its inertia, and the more difficult it is to change its state of motion.

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• 7.

### _________ is the speed with a direction.

Velocity
Explanation
Velocity is the speed with a direction. Unlike speed, which only measures how fast an object is moving, velocity takes into account the direction in which the object is moving. It is a vector quantity that includes both magnitude (speed) and direction. For example, if a car is traveling at 60 miles per hour due north, its velocity would be 60 miles per hour north.

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• 8.

### ______________ states that "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force."

Newton's First Law of Motion
Explanation
Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity in a straight line, unless acted upon by an external force. This means that objects tend to resist changes in their motion, either staying still or moving with the same speed and direction, unless a force is applied to them. This law helps explain why objects keep moving until something stops them, or why we feel a force pushing us backward when a vehicle suddenly accelerates.

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