Quiz 6 - Matter & Energy

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. Can you guess what it is?

• coefficient

• gravity

• centripetal

• pendulum

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'.

Kyndall and Ashton are on a space adventure near a mysterious planet! They notice that objects are being pulled towards the planet's surface. What is this invisible force called?

• work

• gravity

• centripetal

• pendulum

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.

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Bryleigh and Kyndall are on a thrilling roller coaster ride! As they zoom through loops and turns, they wonder what force keeps them on this exciting curved path instead of flying straight off. Can you help them figure it out? The force is a(n) ___.

• centrifugal

• gravity

• friction

• pendulum

• 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.

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Imagine you're in a mythical forest with Kyndall, Bryleigh, and Connor. You come across an ancient clock tower with a mysterious object hanging from a fixed point, swinging back and forth. What is this enchanting object called?

• centripetal

• coefficient

• work

• lever

• 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.

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

• work

• gravity

• pendulum

• coefficient

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.

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During a science quiz, Bryleigh asked, "What is the SI unit of power that lights up our homes and charges our gadgets?"

• ampere

• joule

• newton

• 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.

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?

• Cavendish velocity

• drag velocity

• terminal velocity

• free-fall 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.

During a thrilling race, Kyndall and Ashton notice their toy cars sliding down a ramp. What type of friction is at play as the cars glide smoothly along?

• kinetic friction

• weight friction

• rolling friction

• static 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.

During a science experiment, Ashton and Connor managed to transfer 96 J of energy in just 2.0 seconds! Can you help them calculate the power they achieved?

• 28 W

• 54 W

• 48 W

• 112 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.

Kyndall and Connor are having a friendly race down the hill with their toy tires. Kyndall's tire, weighing 15 kg, is zooming down the road at 9.0 m/s. Can you help Kyndall calculate the magnitude of her tire’s forward momentum to see if she can beat Connor?

• 4 kg x m/s

• 135 kg x m/s

• 48 kg x m/s

• 96 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.

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