How does a parachute help a skydiver land safely?

It decreases his terminal velocity by increasing his air resistance.

It increases his terminal velocity by decreasing his air resistance.

It increases his terminal velocity by increasing his air resistance.

It decreases his terminal velocity by decreasing his air resistance.

change the direction of the motion

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals

zero, since no force is required to keep it moving.

twice the force with which it was fired

the same amount of force with which it was fired

1/2 the force with which it was fired

When a fly crashes into a bus. The forces are the same. Why are the effects so different?

The bus has more mass so it reacts less

The bus has less mass so it reacts more

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it?

They both have the same force acting on them

A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first?

they both reach the ground at the same time

The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that

the ball with the larger force also has the larger mass.

the force acting on them is the same.

the ball with the larger force has the smaller mass.

Given the FBD, which of the following must be true?

The frictional force must be accelerating the system to the left.

The box must be accelerating to the right.

The box must be moving to the right.

The FBD is incorrectly drawn. This situation isn't possible

Sam is hover boarding down the hall at a constant velocity. Assuming there is friction, which of the following must be true?

The frictional force must equal the force applied by the board

The force applied by the board must be greater than the frictional force

The force applied must equal zero

There is not enough information

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

moving upward at a constant speed

moving downward at a constant speed

Three forces of equal magnitude act on the box shown. One force is upward, one downward, and one rightward. Which of the following statements MUST be true based on this information? Select two answers.

The box is accelerating to the right.

The box has a rightward velocity.

The box has a leftward velocity.

"If we apply a(n) ___________ to an object, its __________________ will change and it will ______________."

net force, velocity, accelerate

net force, acceleration, change direction

acceleration, inertia, change direction

Batman exerts a force on 5N on Superman's hand. What is the force that Superman's hand exerts on Batman'?

Sean's does not exert a force on John's

Four identical blocks arranged in different orientations are moving on a surface. The coefficient of kinetic friction between each block and the surface is µ k . The velocity of each block is indicated by the vector on the block. For which block is the force of friction between the surface and the block greatest?

The force of friction is the same for all blocks.

What is the second force in the Newton's Law Force Pair for the downward force of gravity on a man standing on the beach?

the man pulling upward on the earth

the force of friction holding the man still

the pull of the sun keeping the earth in orbit

the surrounding air pressure keeping the man in equilibrium

If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration? (F=ma)

The one with a mass of .52 kg will have the greatest acceleration.

The one with a mass of .78 kg will have the greatest acceleration.

They will both accelerate at the same rate.

Which best explains why we are able to accelerate forward when starting to run?

The striking foot pushes backward against the ground. The friction with the ground provides an equal and opposite force forward.

As one leg moves backward, it provides an equal and opposite force for the other foot to move forward.

No acceleration takes place. Runners are always at a fixed velocity.

The runner's upper body quickly leans forward, causing the entire body to begin accelerating forward

What causes a jet ski to move forward?

The water pushes the jet ski forward

The motor pushes the jet ski forward

The person pushes the jet ski forward

Gravity pushes the jet ski forward

Why is it easier to stand up if you push something down?

The thing you push down pushes you up

It helps your legs get proper posture

It actually doesn't help, its just a mental thing

When you jump upwards, what force is moving you upwards once you leave the ground?

There is no upward force once you leave the ground

If the first force in the Newton's Third Law force pair is Nellie's hand pushing up on the apple, what is the second force?

The apple pushing down on Nellie's hand.

The apple pulling up on the Earth.

The Earth pulling down on the apple.

Nelle's hand pulling up on the Earth

Suppose that an astronaut throws a baseball in outer space at a location far from significant influences of gravity and air resistance. One would expect that the baseball would ____.

continue in motion with the same speed and direction

eventually stop since all objects ultimately "lose their steam"

eventually stop as its inertia slowly becomes used up

either a, b, or c -- depending on whether the astronaut continues to push it

Laws of Motion

Authored by Charles Martinez

Physics

8th - 12th Grade

NGSS covered

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64 questions

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MULTIPLE CHOICE QUESTION

15 mins • 1 pt

When a heavy football player and a light one run into each other, who exerts more force?

The heavy one

The light one

They are equal

there is no such thing as force

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Which one needs a greater net force to move, a kilogram of feathers or a kilogram of iron?

feathers

iron

same

depends on their friction

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A crumpled piece of paper hits the ground before a flat sheet of paper because

the acceleration of gravity is greater on the crumpled paper.

there is more air resistance against the flat paper.

the crumpled paper is more massive

the crumpled paper is less massive.

Tags

NGSS.MS-PS2-4

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Which of the following never changes no matter where in the universe?

weight

force

mass

pounds

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The sum of all forces acting on an object and direction

Contact Force

Balanced Force

Unbalanced Force

Net Force

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

"Terminal velocity" is the velocity at which _____

air resistance is less than weight

air resistance is equal to weight

air resistance is greater than weight

you'd die if you hit the ground

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Is this statement TRUE or FALSE: If the forces acting on an object are balanced, the object CANNOT be moving.

TRUE

FALSE

Tags

NGSS.HS-PS2-1

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Laws of Motion

When a heavy football player and a light one run into each other, who exerts more force?

Which one needs a greater net force to move, a kilogram of feathers or a kilogram of iron?

A crumpled piece of paper hits the ground before a flat sheet of paper because

Which of the following never changes no matter where in the universe?

The sum of all forces acting on an object and direction

"Terminal velocity" is the velocity at which _____

Is this statement TRUE or FALSE: If the forces acting on an object are balanced, the object CANNOT be moving.

How does a parachute help a skydiver land safely?

Objects have a tendency to resist change in their

What are the factors that affect the amount of air resistance on an object? Mark all that apply.

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