Physics Final Review

What happens when two forces act in the same direction?

• They cancel each other out.

• The stronger one prevails.

• Their strengths are added.

• Their sum divided by two is the total force.

Tags

NGSS.MS-PS2-2

The greater the mass of an object....

• the easier the object starts moving.

• the greater its inetia.

• the more balanced it is.

• the more space it takes up.

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NGSS.MS-PS2-2

The force of gravity on a person or object on the surface of a planet is called ____________________.

• mass.

• terminal velocity.

• weight.

• free fall.

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NGSS.MS-PS2-4

The force that one surface exerts on another where the two rub against each other is called _____________.

• friction.

• acceleration.

• inertial.

• gravity.

The law of universal gravitation states that any two objects in the universe that have mass, without exception, __________________________-.

• attract each other.

• repel each other.

• combine to provide a balanced force.

• create friction.

Tags

NGSS.MS-PS2-4

Forces can be added together only if they are ________________________.

• acting on the same object.

• balanced forces.

• unaffected by gravity.

• substantial.

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NGSS.MS-PS2-2

According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail does this.

• Creates a friction with the hammer.

• Disappears into the wood.

• Exerts an equal and opposite force on the hammer.

• Moves at a constant speed.

Tags

NGSS.MS-PS2-1

In physical science, a push or a pull is called a(n) ________________-.

• force.

• acceleration.

• inertia.

• motion.

Which is an example of rolling friction?

• Between your shoes and the sidewalk as you walk.

• Between your bike tires and thr road as you ride.

• Between a boat and the water as it sails.

• Between two hands being rubbed together.

Which of the following is an example of increasing friction intentionally?

• waxing skis

• adding grease to gears on a bike

• throwing sand on an icy driveway

• oiling a squeaky door