Which expression has the same dimensions as an expression yielding a value for acceleration (m/s²)?

• v/t²
• v/x²
• v²/t
• v²/x

Tags

NGSS.HS-PS2-1

Which expression has the same dimensions as an expression yielding a value for time?

• x/v
• x/v²
• t/x
• 1/v²t

Which of the following equations is NOT dimensionally correct?

• Δt=Δx/v
• a=v²/Δx
• Δv=a/Δt
• Δt²=2Δx/a

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A hiker travels south along a straight path for 1.5 h with an average velocity of 0.75 km/hr, then travels south for 2.5 h with an average velocity of 0.90 km/hr.  What is the hiker's displacement for the total trip?

• 1.1 km to the south
• 2.2 km to the south
• 3.4 km to the south
• 6.7 km to the south

A toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s².  What is the final velocity after 6.0 s?

• 10.0 m/s
• 12.0 m/s
• 16 m/s
• 17 m/s

Tags

NGSS.HS-PS2-1

The baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt.  At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

• midway on the way up
• at the top of its trajectory
• the instant it leaves the catcher's hand
• the instant before it arrives in the catcher's mitt

Tags

NGSS.HS-PS2-1

A rock is thrown straight upward with an initial velocity of 24.5 m/s.  What is the rock's displacement after 1.00 s?

• 9.8 m/s²
• 19.6 m/s²
• 24.5 m/s²
• 29.4 m/s²

Tags

NGSS.HS-PS2-1

When there is no air resistance, objects of different masses...

• fall with equal accelerations with similar displacements
• fall with different accelerations with different displacements
• fall with equal accelerations with different displacements
• fall with different accelerations with similar displacements

Tags

NGSS.HS-PS2-1

A car travels down a road at a certain velocity, v_car.  The driver slows down so that the car is traveling only half as fast as before.  Which of the following is the correct expression for the resulting velocity?

• 2v_car
• 1/2 v_car
• -1/2 v_car
• -2 v_car

A football player runs in one direction to catch a pass, then turns and runs twice as fast in the opposite direction toward the goal line.  Which of the following is the correct expression for the original velocity and the resulting velocity?

• -v, -2v
• v, 2v
• v, -2v
• 2v, -v

Tags

NGSS.HS-PS2-2