Constant Acceleration

From which time interval the object is moving at constant acceleration?  

• 0 sec 
• 0 to 20 sec 
• 20 to 40 sec 
• 20 to 60 sec 

Tags

NGSS.HS-PS2-1

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

Being told an object came to a stop tells you that which of these variables is zero?

• a
• vi
• vf
• t

A measurement of 3.5 m/s could be used in which of these variables?

• vi
• a
• t
• x

Tags

NGSS.HS-PS2-2

NGSS.HS-PS3-2

A block slides down a ramp starting at rest for 1.75 seconds with constant acceleration. If its final speed is 0.75 m/s, what is its acceleration?
What equation is most useful in solving this?

• d=st
• x=0.5at^2+x0
• x=((vi+vf)/2)*t + x0
• vf = at + vi

Tags

NGSS.HS-PS2-1

Velocity is both ____ and _____. 

• speed , direction 
• direction, mass
• volume, density 
• direction, magnitude 

You are walking in a straight line at a consistent speed. Do you have acceleration? 

• no
• yes 

Tags

NGSS.HS-PS2-1

Calculate a firefighter slide down a pole in a fire station with an acceleration of 6.2 m/s2. If the firefighter starts at rest and slides for a distance of 3.7 m, what is his final speed?

• 6.5 m/s

• 6.6 m/s

• 6.77 m/s

• 6.9 m/s

Tags

NGSS.HS-PS2-1

Calculate, when you see a traffic light turn red, you apply the brakes and stop with constant acceleration. if your initial speed was 12 m/s, what is your average speed during braking?

• 6.0 m/s

• 6.1 m/s

• 6.2 m/s

• 6.3 m/s

Tags

NGSS.HS-PS2-1

A 12.25 kg meteorite struck a car and leaving a dent 22 cm deep in the trunk. If the its speed was 130 m/s, what was its deceleration?

• 38000 m/s2

• -38000 m/s2

• 0

• None of the above

Tags

NGSS.HS-PS2-1