Centripetal Intro

A body, B, is moving at constant speed in a horizontal circular path around point P. Which diagram shows the direction of the velocity (v) and the direction of the centripetal force (Fc) acting on the body?

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Tags

NGSS.HS-PS2-1

A stone on the end of a string is whirled clockwise at constant speed in a horizontal circle as shown in the diagram above.

Which pair of arrows best represents the directions of the stone's velocity, v, and acceleration, a, at the position shown?

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Tags

NGSS.HS-PS2-1

Which diagram represents the directions of the velocity, , and acceleration, , of a toy car as it moves in a clockwise, horizontal, circular path at a constant speed?

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Tags

NGSS.HS-PS2-1

A 100 kilogram car travels at a constant speed of 20. meters per second around a horizontal circular track. The radius of the track is 50 meters. The magnitude of the car's centripetal acceleration is

• 0.20 m/s2

• 2.0 m/s2

• 8.0 m/s2

• 4.0 m/s2

Tags

NGSS.HS-PS2-1

Base your answer on the information below. A 2.0 × 103-kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30. meters. What is the magnitude of the centripetal acceleration of the car as it goes around the curve?

• 0.40 m/s²

• 4.8 m/s2

• 800 m/s2

• 9,600 m/s²

Tags

NGSS.HS-PS2-1

The graph above represents the relationship between velocity and time of travel for a toy car moving in a straight line.

The shaded area under the line represents the toy car's

• displacement

• momentum

• acceleration

• speed

How far will a brick starting from rest fall freely in 3.0 seconds?

• 15 m

• 29 m

• 44 m

• 88 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A baseball bat exerts a force of magnitude F on a ball. If the mass of the bat is three times the mass of the ball, the magnitude of the force of the ball on the bat is

• F

• 2F

• F/2

• 3F

Tags

NGSS.HS-PS2-1

A satellite weighs 200 newtons on the surface of Earth. What is its weight at a distance of one Earth radius above the surface of Earth?

Remember that Force changes inversely with the square of the distance.

• 50 N

• 100 N

• 400 N

• 800 N

Tags

NGSS.HS-PS2-4

Jim wishes to push a 100. N wood crate across a wood floor. What is the minimum horizontal force that would be required to start the crate moving?

 $Ff=\mu FN$  The crate is not moving

• 30. N

• 42 N

• 72 N

• 100 N

Tags

NGSS.HS-PS2-1