Fast and the Curious - Forces and Motion

Law of Inertia is

• Newton's 1st law

• Newton's 2nd law

• Newton's 3rd law

• Law of conservation of momentum

Answer explanation

The Law of Inertia is Newton's 1st law, which states that an object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an external force.

"For every action, there is an equal and opposite reaction" represents

• Newton's 1st law

• Newton's 2nd law

• Newton's 3rd law

• Law of conservation of momentum

Answer explanation

The statement 'For every action, there is an equal and opposite reaction' represents Newton's 3rd law, which states that every action has an equal and opposite reaction force.

F=ma represents

• Newton's 1st law

• Newton's 2nd law

• Newton's 3rd law

• Law of conservation of momentum

Answer explanation

The equation F=ma represents Newton's 2nd law, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration.

Tags

NGSS.HS-PS2-1

Why is it harder for the boy in Image B to get down the hill?

• Motion

• Friction

• Work

• Displacement

Answer explanation

Friction is the force that opposes the motion of the boy in Image B, making it harder for him to get down the hill.

F = mass * acceleration

A 20 kg bike accelerates at 10 m/s². What is the force acting upon it?

• 25 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

Answer explanation

The force acting upon the bike is calculated by multiplying the mass (20 kg) by the acceleration (10 m/s^2), resulting in 200 Newtons. Therefore, the correct answer is 200 Newtons.

Tags

NGSS.HS-PS2-1

When you hit a tennis ball with a racket...

• The ball exerts more force on the racket

• The ball and racket exert the same force on each other

• The racket exerts more force on the ball

• It depends on how hard you hit it

Answer explanation

When you hit a tennis ball with a racket, the ball and racket exert the same force on each other according to Newton's third law of motion.

Tags

NGSS.HS-PS2-1

The rate that a car's velocity changes is its

• speed

• force

• gravity

• acceleration

Answer explanation

The rate that a car's velocity changes is known as acceleration, not speed, force, or gravity.

Tags

NGSS.HS-PS2-1

The SI unit for acceleration is

• mph

• ft/sec^2

• m/s^2

Answer explanation

The correct SI unit for acceleration is m/s^2, which stands for meters per second squared.

Tags

NGSS.HS-PS2-1

A vector quantity has . . .

• magnitude only

• direction only

• both magnitude and direction

• neither

Answer explanation

A vector quantity has both magnitude and direction, making it a unique characteristic of vectors.

The momentum of an object depends upon the object's mass and velocity.

• size and shape

• mass and speed

• mass and velocity

• mass and energy

Answer explanation

The momentum of an object depends upon the object's mass and velocity, as momentum is calculated by multiplying mass and velocity together.

Tags

NGSS.HS-PS2-2