Dynamics Physics

what is the speed of an object at rest?

• 0.0 m/s

• 1.0 m/s

• 9.81 m/s

• -9.81 m/s²

Acceleration is

• displacement

• the rate of change of displacement

• velocity

• the rate of change of velocity

Tags

NGSS.HS-PS2-1

Velocity is (select all that apply)

• speed with a direction

• a vector

• rate of change of displacement

• rate of change of acceleration

Displacement is (select all that apply)

• how far an object is from where it started

• how far an object has traveled

• a scalar

• a vector

distance is (select all that apply)

• a scalar

• how far an object moves is all of its travels

• always positive

• how far an object is from where it started

A shopping cart given an initial velocity of 2.0 m/s undergoes a constant acceleration of 3.0 m/s². What is the magnitude of the cart's displacement after the first 4.0 s of its motion?

• 10.0 m

• 55 m

• 32 m

• 80.0 m

Tags

NGSS.HS-PS2-1

A curious kitten pushes a ball of yarn at rest with its nose displacing the ball of yarn 15.4 cm in 3.00 s. What is the acceleration of the ball of yarn?

• 4.38 cm/s²

• 3.42 cm/s²

• 46.2 cm/s²

• 18.4 cm/s²

Tags

NGSS.HS-PS2-1

A rock is thrown straight upward with an initial velocity of 24.5 m/s where the downward acceleration due to gravity is -9.81 m/s². What is the rock’s displacement after 1.00 s?

• 9.81 m

• 19.6 m

• 24.5 m

• 29.4 m

Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it?

• 4.0 cm

• 9.8 cm

• 16.0 cm

• 19.6 cm

Tags

NGSS.HS-PS2-1

A runner moves 40 m to the right and then 10 m to the left. What is the runner’s displacement after the two moves?

• 30 m to the right

• 40 m to the right

• 50 m

• 30 m