Midterm Physics Review Vectors, Projectile Motion, Forces

A 20 Newton force and a 5 Newton force are acting in opposite directions on the same point on an object. Find the magnitude of the resultant vector.

• 25 Newton

• 5 Newton

• 15 Newton

• 100 Newton

Tags

NGSS.HS-PS2-1

For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck?

• 12.5 m/s south

• -12.5 m/s south

• -7.5 m/s south

• 7.5 m/s south

Give resultant velocity for a motorboat with a velocity of 5.5 m/s south that is pushed eastward by the current at a rate of 3.5 m/s.

• 6.5 m/s

• 9.0 m/s

• 12.4

• 2.0 m/s

Four equal forces of 1 Newton are pushing on the same point of an object. The forces are pushing from the north, the south, the east and the west. Find the resultant force acting on the object.

• 0 Newtons

• 2 Newtons

• 4 Newtons

Tags

NGSS.HS-PS2-1

Vectors A and B are perpendicular to each other. You can use __ to calculate the resultant of A + B.

• the cosine function.

• the sine function.

• the tangent function.

• the Pythagorean theorem.

A projectile is launched with a speed of 25 m/s at angle of 45°. Its initial vertical speed is equal to

• 25tan(45°) m/s

• 25sin(45°) m/s

• 25cos(45°) m/s

To calculate the horizontal part of a vector, use

• the cosine function.

• the Pythagorean theorem.

• the tangent function.

• the sine function.

The acceleration due to gravity is

• 19.8 m/s2

• 9.8 m/s

• -9.8 m/s2

• - 9.8 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

To calculate the vertical part of a vector, use

• the cosine function.

• the sine function.

• the Pythagorean theorem.

• the tangent function.

A projectile is launched with a speed of 25 m/s at angle of 45°. Its initial horizontal speed is equal to

• 25sin(45°) m/s

• 25tan(45°) m/s

• 25cos(45°) m/s