Science: Matter & Energy Flashcard 6

Front

In a thrilling race between Connor and Big Baby, the friction between their shoes and the track is determined by a magical, unitless number known as the ___ of friction.

Back

coefficient

Answer explanation

The friction between two surfaces is quantified by the coefficient of friction, which is a unitless value representing the ratio of the force of friction to the normal force. Thus, the correct answer is 'coefficient'.

Front

What is the invisible force that pulls objects towards a planet's surface?

Back

gravity

Answer explanation

The gravitational force acting on an object near the surface of the Earth is referred to as gravity. It is the force that attracts objects towards the center of the Earth or any celestial body.

Tags

NGSS.HS-PS2-4

Front

What force keeps Bryleigh and Kyndall on a curved path during a roller coaster ride?

Back

centripetal

Answer explanation

A centripetal force is necessary for an object to move in a curved path, as it acts towards the center of the circle, preventing the object from moving in a straight line. Other options do not specifically describe this force.

Tags

NGSS.HS-PS2-1

Front

What is the enchanting object hanging from a fixed point, swinging back and forth, in a mythical forest clock tower?

Back

pendulum

Answer explanation

A pendulum is an object that swings back and forth from a fixed point due to the force of gravity. The other options do not describe this motion, making 'pendulum' the correct choice.

Front

Ashton and Connor are playing a game where they transfer energy from one object to another using a force. What is this process called?

Back

work

Answer explanation

The transfer of energy from one object to another by a force is defined as work. It involves applying a force over a distance, which results in energy being transferred, making 'work' the correct answer.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

Front

What is the SI unit of power that lights up our homes and charges our gadgets?

Back

watt

Answer explanation

The SI unit of power is the watt, which measures the rate of energy transfer. One watt is equivalent to one joule per second, making it the correct choice among the options provided.

Front

During a science experiment, Bryleigh and Connor are curious about the speed at which air resistance stops a falling object from accelerating. What is this speed called?

Back

terminal velocity

Answer explanation

Terminal velocity is the speed at which the force of air resistance equals the weight of the falling object, preventing further acceleration. Thus, it is the correct answer to the question.

Front

What type of friction is at play as toy cars glide smoothly down a ramp?

Back

kinetic friction

Answer explanation

Kinetic friction is the force that opposes the motion of an object that is already sliding. It acts on moving objects, unlike static friction, which prevents motion. Therefore, the correct answer is kinetic friction.

Front

Calculate the power achieved when 96 J of energy is transferred in 2.0 seconds.

Back

48 W

Answer explanation

Power is calculated using the formula: Power = Energy / Time. Here, Power = 96 J / 2.0 s = 48 W. Therefore, the correct answer is 48 W.

Front

Kyndall's tire weighs 15 kg and is moving at 9.0 m/s. Calculate the magnitude of its forward momentum.

Back

135 kg x m/s

Answer explanation

Momentum is calculated using the formula: momentum = mass x velocity. Here, mass = 15 kg and velocity = 9.0 m/s. Thus, momentum = 15 kg x 9.0 m/s = 135 kg x m/s, making the correct answer 135 kg x m/s.

Tags

NGSS.HS-PS2-2