PLTW Kinematics

An object can be moving for 10 seconds and still have zero displacement.

• True
• False

An airplane accelerates down a runway at 3.20 m/s/s
for 8 s until it finally lifts off the ground.
Determine the velocity at take-off.

• 0.4 m/s
• 25.6 m/s
• 2.5 m/s

Tags

NGSS.HS-PS2-1

At 60 seconds, how far had this object traveled? 

• 0 m
• 10 m
• 20 m
• 40 m

Describe the motion

• Slow to fast;   Negative direction
• Fast to slow;   Negative direction
• Fast to slow;   Positive direction
• Slow to fast;   Positive direction

Tags

NGSS.HS-PS2-1

This is the x-tgraph of the motion of a particle. Of the four points P, Q, R,and S, the velocity vx is greatest (most positive) at

• P

• Q

• R

• S

This is the x-tgraph of the motion of a particle. Of the four points P, Q, R,and S, the speed is greatest at

• P

• Q

• R

• S

This is the x-tgraph of the motion of a particle. Of the four points P, Q, R,and S, the acceleration ax is greatest (most positive) at

• P

• Q

• R

• S

Tags

NGSS.HS-PS2-1

You toss a ball straight upward, in the positive direction. The ball falls freely under the influence of gravity.

At the highest point in the ball’s motion,

• its velocity is zero and its acceleration is zero.

• its velocity is zero and its acceleration is positive (upward).

• its velocity is zero and its acceleration is negative (downward).

• its velocity is positive (upward) and its acceleration is zero.

• its velocity is positive (upward) and its acceleration is zero.

Tags

NGSS.HS-PS2-1

This is a motion diagram of an object moving along the x-direction with constant acceleration. The dots 1, 2, 3, … show the position of the object at equal time intervals ∆t. Which of the following vx-tgraphs best matches the motion shown in the motion diagram?

• 
• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

An object moves along the x-axis with constant acceleration. The initial position x is positive, the initial velocity is negative, and the acceleration is positive.

Which of the following vx-t graphs best describes this motion?

• 
• 
• 
• 
• 

Tags

NGSS.HS-PS2-1