Motion Celebration

How is acceleration defined when considering a car increasing its speed on a highway?

• The rate at which the car's velocity changes over time. How fast the car speeds up.

• The distance covered by the car in motion

Answer explanation

Acceleration is defined as the rate at which the car's velocity changes over time, or how fast the car speeds up.

Tags

NGSS.MS-PS2-2

How has John Paul Stapp helped save thousands of lives each year?

• By developing airbags

• By conducting crash tests

Answer explanation

John Paul Stapp helped save thousands of lives each year by conducting crash tests, which led to the development and improvement of safety measures like airbags.

Tags

NGSS.MS-ETS1-4

Which of these would be the best way to find whether a toy car will roll faster down a board covered with sandpaper or a board covered with aluminum foil?

• Measuring the time it takes the car to roll all the way down each board

• Measuring the length and height of each board

Answer explanation

Measuring the time it takes the car to roll all the way down each board is the best way to find whether a toy car will roll faster down a board covered with sandpaper or a board covered with aluminum foil.

Tags

NGSS.MS-PS3-1

When the P.E. teacher asks you to play a game with a hula hoop, which type of force is responsible for keeping the hoop moving around your waist?

• Inertia

• Acceleration

Answer explanation

The correct answer is Inertia. Inertia is the force that keeps the hula hoop moving around your waist once it is in motion.

Emily and Sarah are designing an experiment to test how far 1-kg, 2-kg and 4-kg metal washers can be pulled using the same force. What must remain constant in the girls’ experiment?

• the mass of the washers

• the amount of force applied

Answer explanation

The amount of force applied must remain constant in the girls' experiment to test the metal washers.

Tags

NGSS.MS-ETS1-1

Imagine you're driving a car. What does the speedometer measure?

• How fast the car is moving

• The distance from your starting point

Answer explanation

The speedometer measures how fast the car is moving, so it indicates the speed of the car.

Tags

NGSS.MS-PS3-1

John is trying to calculate how fast he needs to drive to reach his destination 300km away in 3 hours. What is the formula he should use to find his speed?

• s=t*d

• s=d/t

Answer explanation

The formula he should use to find his speed is s=d/t, where s is speed, d is distance, and t is time.

When a car rounds a corner on a flat road, what kind of force is acting upon it to keep it in a curved path?

• A force that keeps the car moving on a circular path

• The force of gravity on the car

Answer explanation

The force that keeps the car moving on a circular path is acting upon it to keep it in a curved path.

What must a soccer player apply to the ball to change its motion during a game?

• A push or a pull

• A straight path

Answer explanation

A soccer player must apply a push or a pull to the ball to change its motion during a game, as these forces can alter the ball's direction and speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Imagine a soccer ball lying in the middle of a field. According to Newton's Third Law, the ball will remain in its place unless a player kicks it. Is this interpretation correct?

• True

• False

Answer explanation

The interpretation is incorrect because according to Newton's Third Law, the ball will remain at rest unless acted upon by an external force, such as gravity or friction.