Physics Final Review

A ball is thrown horizontally with an initial velocity of 15 m/s from the top of a tower 75 m high. What is the initial horizontal velocity of the ball?

• 0 m/s

• 3.9 m/s

• 14.5 m/s

• 15 m/s

The diagram shows a ball projected horizontally with an initial velocity of 50 m/s east, off a cliff 100 m high. (Neglect air resistance) During the flight of the ball, what is the direction of its vertical velocity?

• eastward

• westward

• upward

• downward

Tags

NGSS.MS-PS2-4

For general projectile motion with no air resistance, the horizontal component of a projectile’s velocity _____.

• continuously increases

• remains a non-zero constant

• first decreases then increases

• remains zero

Action-reaction forces from Newton’s Third Law _____.

• always act on different objects

Tags

NGSS.MS-PS2-1

An object moving East begins to slow down after stopping at a traffic traffic light. Make a statement concerning its acceleration.

• 1. The car is deccelerating, and its acceleration is positive.

• 1. The car is deccelerating, and its acceleration is negative.

• 1. The acceleration is zero.

• A statement cannot be made using the information given.

The shows Tom’s journey going from home to the bus stop. During the segment of 70 to 100 seconds, which direction is Tom moving?

• 1. Tom is moving away from his house.

• 1. Tom is moving toward his house.

• 1. Tom is standing still.

• Cannot be determined.

Tags

NGSS.MS-PS3-1

In order to equally accelerate an object with double the mass, we would need to apply a force

• That has twice the magnitude

• that is equal in magnitude

• that has half the magnitude

• that has quadruple (four times) the magnitude

Tags

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If an object is moving at twice its original velocity, its Kinetic energy is now

• twice the magnitude

• equal in magnitude

• half the magnitude

• quadruple (four times) the magnitude

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

an Electromagnet increases in strength when

• the current increase

• the number of loops increases

• the iron core is more conductive

• all of the above

Tags

NGSS.MS-PS2-3

An object that experiences balanced forces is...

• not moving

• In Free-fall

• In equilibrium

• not magnetic