If the force acting on the objects is constant, which statement about inertia and acceleration is supported by the data?

Question

(1 point)

• An object with less mass has more inertia which causes it to speed up more quickly.

• An object with a higher mass has less inertia which causes it to speed up more quickly.

• An object with a higher mass has more inertia which causes it to speed up
less quickly.

An object with less mass has less inertia which causes it to speed up less quickly.

Answer 1

The correct statement supported by the data is:

• An object with a higher mass has more inertia which causes it to speed up less quickly.

This is consistent with Newton's second law of motion, which states that acceleration is inversely proportional to mass (when force is constant). Therefore, an object with greater mass (and thus greater inertia) will experience less acceleration than an object with less mass under the same constant force.

Answer 2

Why does the disc fall straight down into the glass when we quickly pull the index card away from the glass in a horizontal direction?
(1 point)
• equilibrium
• static friction
• kinetic friction
• inertia

Answer 3

The correct answer is:

• inertia

When the index card is pulled away quickly, the disc remains at rest due to its inertia. Inertia is the property of an object to resist changes in its state of motion. Since there is no longer any support for the disc (once the card is pulled away), gravity acts on it, causing it to fall straight down into the glass.

Answer 4

A student is riding the school bus. The bus stops as the driver applies the brakes. Which of these statements best describes this situation? (1 point)
• The school bus does not lose or gain kinetic energy.
• A force is changing the motion of the bus.
• The bus is gaining energy because of friction.
• There is no force acting on the bus so it stops moving.

Answer 5

The statement that best describes the situation is:

• A force is changing the motion of the bus.

When the driver applies the brakes, a force is applied to the bus to decelerate it, changing its motion and causing it to stop.

Answer 6

A pitcher throws a baseball to the catcher. The ball's path begins as a straight line, and then its patch curves toward the ground. Which two forces are acting on the baseball? (1 point)
•
electricity and friction
• gravity and friction
inertia and magnetism
• nuclear and inertia

Answer 7

The correct answer is:

• gravity and friction

As the baseball is thrown, gravity acts downward on the ball, pulling it toward the ground. Additionally, friction acts on the ball due to the air resistance it encounters as it moves through the air, which can also influence its path.

Answer 8

Two people are in a rowboat on a river. The current of the river water carries them at a speed of five meters per second even when they are no rowing. What will happen to the boat's motion of no other forces act on the boat?
(1 point)

• The boat's speed will increase.

• The boat's speed will decrease.

• The boat's speed will stay the same.

• The boat will change direction.

Answer 9

The correct answer is:

• The boat's speed will stay the same.

If no other forces act on the boat, it will continue to move at the same speed as the current, which is five meters per second. According to Newton's first law of motion, an object in motion will stay in motion at a constant speed in a straight line unless acted upon by a net external force.