ST 2 in Physics Reviewer

When Abigail pushes a shopping cart with a certain force, what does Newton's Second Law of Motion explain about the cart's movement?

• The relationship between speed and distance

• How velocity changes when subjected to a force

• The effect of gravity on mass

• The conservation of energy

Answer explanation

Newton's Second Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Thus, when Aria pushes the cart, the force changes its velocity.

Tags

NGSS.MS-PS2-2

Ethan is pushing a shopping cart at the grocery store. According to Newton's Second Law, what is the formula for the force he applies to the cart?

• F=mv

• F=ma

• F=mg

• F=mc^2

Answer explanation

According to Newton's Second Law, the force applied (F) is equal to the mass (m) of an object multiplied by its acceleration (a). Therefore, the correct formula is F=ma.

Tags

NGSS.MS-PS2-2

Oliver is pushing a wheelbarrow with a constant force. If the wheelbarrow becomes heavier as more items are added, what happens to its acceleration?

• Acceleration increases

• Acceleration decreases

• Acceleration remains constant

• Acceleration becomes zero

Answer explanation

According to Newton's second law, acceleration is inversely proportional to mass when force is constant. As the cart becomes heavier with more items, its mass increases, leading to a decrease in acceleration.

Tags

NGSS.MS-PS2-2

Emma is pushing a shopping cart at the grocery store. In the formula F=ma, what does 'a' represent?

• Area

• Acceleration

• Altitude

• Amplitude

Answer explanation

In the formula F=ma, 'a' represents acceleration, which is the rate of change of velocity. This is crucial in understanding how force affects the motion of the shopping cart Emma is pushing.

Tags

NGSS.HS-PS2-1

Charlotte is pushing a shopping cart at the grocery store. What is the unit of force she is applying to the cart?

• Kilogram (kg)

• Meter per second squared (m/s²)

• Newton (N)

• Joule (J)

Answer explanation

The unit of force is the Newton (N), which is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. Therefore, Charlotte is applying a force measured in Newtons.

Rohan is driving a delivery truck with a mass of 1,000 kg and it accelerates at 2 m/s². What is the force acting on the truck?

• 500 N

• 2,000 N

• 1,000 N

• 4,000 N

Answer explanation

To find the force acting on the car, use Newton's second law: F = m * a. Here, m = 1000 kg and a = 2 m/s². Thus, F = 1000 kg * 2 m/s² = 2000 N. Therefore, the correct answer is 2,000 N.

Tags

NGSS.MS-PS2-2

Kai is conducting an experiment where he measures the force applied to a cart and the resulting acceleration. In a force vs. acceleration graph, what does the slope of the line represent?

• Force

• Acceleration

• Mass

• Velocity

Answer explanation

In a force vs. acceleration graph, the slope represents mass, according to Newton's second law (F = ma). Thus, the correct answer is mass.

Emma and Kai are conducting an experiment where they measure the force applied to a cart and the resulting acceleration. What does a steeper slope in their force vs. acceleration graph suggest?

• Greater acceleration

• Greater mass

• Greater force

• Greater velocity

Answer explanation

A steeper slope in the force vs. acceleration graph indicates that for a given increase in force, the acceleration increases more significantly. This suggests a greater mass, as per Newton's second law (F=ma).

Tags

NGSS.MS-PS2-2

Anika is playing with her toy car and decides to add more weight to it while pushing it with the same force. What happens to the car's acceleration?

• Acceleration increases

• Acceleration decreases

• Acceleration remains constant

• Acceleration becomes zero

Answer explanation

According to Newton's second law, acceleration is inversely proportional to mass when force is constant. Adding weight increases the mass of the car, which results in decreased acceleration.

Tags

NGSS.MS-PS2-2

Mia is conducting an experiment to understand how different forces affect the acceleration of a toy car. What should Mia keep constant to accurately measure the effect of these forces on acceleration?

• Mass

• Velocity

• Time

• Distance

Answer explanation

Mia should keep the mass of the toy car constant to accurately measure how different forces affect its acceleration. Changing the mass would influence the results, making it difficult to isolate the effect of the forces.

Tags

NGSS.MS-PS2-2