Which law explains why it takes more force to move a truck than to move a bike at the same speed?

Newton's 2nd Law of Motion The force acting on an object is equal to the mass of that object times its acceleration

Newton's 1st Law of Motion/ Inertia an objects resistence to change without another force acting on it.

A person in car slides to the right when going through a very sharp left turn on the highway.

1st Law/ / Inertia an object's resistence to change without another force acting on it.

2nd Law/ The force acting on an object is equal to the mass of that object times its acceleration

Which law states that if I push against a wall, the wall pushes against me?

Law 3/ For every action there is an equal and opposite action.

Law 2/ The force acting on an object is equal to the mass of that object times its acceleration

A picture is hanging on the wall, and is not moving.

1st Law/ Inertia an objects resistence to change without another force acting on it.

3rd Law/ For every action there is an equal and opposite reaction.

What kind(s) of objects have inertia?

only objects whose motion is being changed

The law of inertia (Newton’s First Law) applies

to both moving and nonmoving objects

only to objects that are not moving

A person would weigh less on on the Moon than on the Earth because . . .

Moon has less mass and therefore less gravity

Moon has more mass, and therefore more gravity

Moon has less mass, and therefore more gravity

Moon has more mass, and therefore less gravity

The strength of the force of gravity between two objects depends on _____ factors

The masses of objects and the distance between them

The masses of objects and the gravitational pull

The mass of the planet and the mass of the object

If a feather and a hammer are dropped at the same time on the moon, where there is no atmosphere, which one will hit the ground first?

Neither, there is no gravity on the moon.

hammer because it has more mass

feather because it has less mass

A wheeled cart is moving to the right at a constant speed. Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?

Balanced Forces, Constant Speed

Unbalanced Forces, Constant Speed

Unbalanced Forces, Acceleration

How will this object move?

It will move in both directions.

Which could be an example of a balanced force?

An asteroid moving at a constant speed through space

A car accelerating from a stop sign

A box of dishes falling from a counter

Which could be an example of an unbalanced force?

A baseball that has been thrown to home plate.

A plate sitting on a dining table

A ball at the top of a hill that is not moving

Force and Motion Unit

Authored by Stephanie Quinn

Physics

7th - 8th Grade

NGSS covered

Used 82+ times

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44 questions

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MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the speed of an object that travels 60 meters in 4 seconds? Remember: S=d/t

240 m/s

15 m/s

0.067 m/s

15 mph

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is happening at C?

Stationary

Accelerating

Fast steady speed; moving away from the starting position

Slower steady speed; moving away from the starting position

What is happening at D?

Stationary

Accelerating

Fast steady speed; moving away from the starting position

Slower steady speed; moving away from the starting position

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is happening at A?

Stationary

Accelerating

Slower steady speed; moving away from the starting position

Steady speed; returning to start position

What does this graph represent?

Constant Speed

Acceleration

Not moving

How long did it take this object to travel 10 m?

0 s

10 s

15 s

20 s

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

How long did it take this object to travel back to its reference/starting point?

20 s

30 s

60 s

100 s

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Force and Motion Unit

What is the speed of an object that travels 60 meters in 4 seconds? Remember: S=d/t

What is happening at C?

What is happening at D?

What is happening at A?

What does this graph represent?

How long did it take this object to travel 10 m?

How long did it take this object to travel back to its reference/starting point?

At 60 seconds, how far had this object traveled?

What does this graph represent?

At what rate did the rain fall?

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