Question 1

As stated in the first law of motion, an object in motion will continue in

motion at a constant velocity. But why is it that when you slide an object on

the surface, the object will eventually slow down and stop?

Accepted Answer

the object experiences an external force that resists its motion and makes an object slow down and stop

Answer

the object experiences normal force that resists its motion

Question 2

Two cars are moving with the same velocity. Car A has a mass of 1000 kilograms while car B has a mass of 1300 kilograms. How much inertia does car B have compared to car A?

Accepted Answer

The mass is relative to the inertia or directly proportional, therefore car B has greater inertia than A

Answer

The inertia of car B is twice the inertia of car A.

Question 3

When do we say that the object accelerates?

Accepted Answer

When the object has increased its net force then it moves based on the amount of force.

Answer

When the object moves at a constant velocity.

Question 4

Which of the following best explains why passengers need to fasten their seatbelts?

Accepted Answer

A body at rest will remain at rest, and a body in motion will continue moving unless acted upon by a net force due to the external force.

Question 5

Which of the following statements best describes the first law of motion?

Accepted Answer

A moving object will remain in motion unless compelled to change its state by the action of an external force.

Question 6

Which of the following is caused by unbalanced force?

Accepted Answer

There is a change in direction of a moving object since force is not balanced.

Answer

An object will continuously move from one direction to another at a constant velocity.

Question 7

Which of the following is true about inertia?

Accepted Answer

Inertia can make the object at rest or in motion and change its velocity based on the force exerted on it

Answer

Inertia is an example of force based on Newton’s Laws of Motion

Question 8

When you blow up a balloon, gas particles move freely within the balloon and pressure builds up. When you release the opening of the balloon, it quickly moves away from you as it releases the air inside it. What could be the best explanation for this?

Accepted Answer

As the air is released out of the balloon in one direction, an equal force propels the balloon in the other direction.

Answer

The air inside the balloon moves fast.

Question 9

A man shoots a rifle and the force of the shot results in recoil. How will you describe the magnitude of the force on the rifle with the magnitude of the force on the bullet?

Accepted Answer

The magnitude of the force on the rifle is equal to the magnitude of the force on the bullet since Newton’s Third law states that for every action there is an equal but opposite reaction.

Answer

The rifle exerts a greater force on the bullet.

Question 10

Study the picture below. Why is it that the action and reaction forces from the nail and hammer do not cancel out?

Accepted Answer

The hammer and the nails are 
       interacting, and they 
       follow action-reaction with an equal magnitude of forces.

Answer

The direction of the forces is parallel with each other.

Question 11

In Newton’s Third Law of Motion, why the forces do not cancel out each other?

Accepted Answer

//The forces have equal magnitude.

Answer

The two forces are in the same direction.

Question 12

Railey is riding his skateboard and pushes the ground with his foot. This causes him to accelerate at a certain distance. What could be the best explanation for this?

Accepted Answer

multiplem

Answer

The ground exerts greater force than the foot.

Question 13

Why do swimmers in a competition push off the wall of a pool with their feet?

Accepted Answer

multiplem

Answer

The feet of the swimmer exert a force on the water.

Question 14

In outer space, if an astronaut wanted to move upward, in which direction should he throw the object?

Accepted Answer

He should throw the object downward because the object will then exert an equal force on him in the opposite direction.

Answer

He should throw the object downward

Question 15

The gravitational potential energy of a yoyo decreases as it spins downward. Which of the following statements BEST describe gravitational potential energy?

Accepted Answer

Gravitational potential energy is stored in an object because of its height and decreases as the object falls to the ground.

Answer

Gravitational potential energy is stored in an object that is at rest.

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