AP Physics 1- Final Review

A cart is moving along a straight track and has velocity +0.5 m/s and positive acceleration at time 1 s. At time 3 s, the cart reaches a maximum speed. At time 4 s, the cart again has velocity +0.5 m/s, but with negative acceleration. A student claims that the average acceleration of the cart between time 1 s and 4 s time is zero. Is the student's claim correct? Why or why not?

• Yes, because the final velocity of the cart is equal to the initial velocity.

• Yes, because the cart returns to its original position.

• No, because the values of the acceleration at time 1 s and time 4 s are unknown.

• No, because the cart spends more time with a positive acceleration than with a negative acceleration.

Tags

NGSS.HS-PS2-1

A car is driving east on a straight, level road with a speed of 20 m/s when it begins to accelerate eastward at a constant rate. After 5 s the car has a speed of 40 m/s to the east. The acceleration of the car during the 5 s time interval is

• 4 m/s²

• 8 m/s²

• 20 m/s²

• 30 m/s²

Tags

NGSS.HS-PS2-1

A cart begins to move from rest on a horizontal track. The acceleration of the cart as a function of time is shown in the graph. Which of the following correctly indicates the magnitude of the average velocity of the cart during the interval shown, and provides a valid explanation?

• Less than 2 m/s because the cart has a velocity of 2 m/s for the first half of the interval and zero velocity for the second half.

• Less than 2 m/s because the cart is traveling at a speed of 2 m/s or less during the time interval.

• Equal to 2 m/s because the cart is initially at rest and then moves at a constant speed of 2 m/s during the second half of the interval.

• Equal to 2 m/s because the cart has an average acceleration of 1 * m / s ^ 2 over an interval of 2 s.

Tags

NGSS.HS-PS2-1

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• 
• 
• It cannot be determined without knowing the distance traveled by the cars.

Tags

NGSS.HS-PS2-1

• - 20m / s

• - 5m / s

• - 1.2m / s

• 0m/s

Tags

NGSS.HS-PS2-1

• The transition between intervals A and B.

• The transition between intervals B and C.

• The transition between intervals C and D.

• The transition between intervals D and E.

• The cart is moving left with speed 1.0 cm/s.

• The cart is moving right with speed 1.0 cm/s.

• The cart is moving left with speed 0.5 cm/s.

• The cart is moving right with speed 0.5 cm/s.

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• 
• 
• 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

• The car moves with constant speed, momentarily stops, and then moves again with the same speed.

• The car is slowing down at a constant rate, then speeds up but at a slower rate.

• The car moves with constant speed.

• The car speeds up at a constant rate.

• The passenger is moving at 20 m/s relative to the shore because the boat is

  moving at 5 m/s relative to the shore and the passenger is moving at 15 m/s relative to the water.

• The passenger is moving at 20 m/s relative to the shore because the sum of all of the velocities (10 m/s, 5 m/s, and 5 m/s) is 20 m/s.

• The passenger is stationary relative to the shore because the boat is moving at 5 m/s relative to the shore and the passenger is moving at 5 m/s relative to the boat in the opposite direction.

• The passenger is stationary relative to the shore because the boat is moving at 15 m/s relative to the water and the passenger is moving at 15 m/s in the opposite direction relative to the water