C2 Forces and motion I

Which of the following situations represents a negative displacement?(Assume positive position is measured vertically upward along y-axis.)

• A cat stands on a tree limb.

• A cat jumps from the ground onto a tree limb.

• A cat jumps from a lower tree limb to a higher one.

• A cat jumps from a tree limb to the ground.

Acceleration is defined as

• a rate of displacement
• the rate of change of displacement.
• the change in velocity
•  the rate of change of velocity.

Tags

NGSS.HS-PS2-1

The graph above describes the motion of a ball. At what point does the ball have an instantaneous velocity of zero

• 1 s

• 2 s

• 3 s

• 4 s

Tags

NGSS.MS-PS3-1

When there is no air resistance, objects of different masses dropped from rest

• fall with equal accelerations and with equal displacements.

• fall with different accelerations and with different displacements.

• fall with equal accelerations and with different displacements.

• fall with different accelerations and with equal displacements.

Tags

NGSS.HS-PS2-1

A person walks 70 m east, then 40 m west. What is the total distance traveled by the person?

• 110 m

• 30 m

• 55 m

• 30 km

The tendency of an object to stay in motion or at rest is called 

• velocity
• acceleration
• speed
• inertia

A soccer ball takes 20 s to roll 10 m. What is the average speed of the soccer ball?

• 200 m s^-1

• 5 m s^-1

• 2 m s^-1

• 0.5 m s^-1

What is the acceleration of an object that speeds up from 1 m s^-1 to 5 m s^-1 in 2 s?

• 3 m s^-2

• 2 m s^-2

• 4 m s^-2

• 5 m s^-2

What does this graph represent?

• Constant speed

• Acceleration

• Stationary

• Deceleration

The acceleration produced by a force on an object is

• directly proportional to the magnitude of the force.

• in the same direction as the force

• inversely proportional to the mass of an object

• all of the above

Tags

NGSS.MS-PS2-2