Chapter 2 Speed, Time--Graph, Velocity, and Force

A dog runs 60 m in 20 s and then 40 m in 20 s. The average speed of the dog was __________ m/s.

• 30 m/s

• 25 m/s

• 60 m/s

• 40 m/s

How is an object's speed different from its velocity?

• Velocity includes time, but speed does not.

• Speed includes motion, but velocity does not.

• Speed includes distance, but velocity does not.

• Velocity includes direction, but speed does not.

During the first 10 minutes, the person's speed was ________.

• 1.0km/m

• There was no movement

• 0.1 km/m

• 0.1 mph

Tags

NGSS.MS-PS3-1

During the next 20 minutes, the speed was ________.

• 30 km/m

• .03 km/m

• 3.0 km/m

• 0 km/m

Tags

NGSS.MS-PS3-1

Two dogs are pulling on a bone. How must the dogs be pulling in order for the bone not to move?

• in opposite directions with different force

• in the same direction with different force

• in the same direction with equal force

• in opposite directions with equal force

Tags

NGSS.3-PS2-1

Which examples did the student incorrectly classify:

• Examples 2 and 4

• Examples 1 and 2

• Examples 1 and 3

• Examples 3 and 4

A worker is pushing a cart straight across a factory floor. When are the forces on the cart unbalanced?

• when it first starts moving

• when it slows to a stop

• when it travels at a constant speed

• when it begins to speed up

Tags

NGSS.MS-PS2-2

Student A pushes a box to the right with a force of 50 N, causing it to begin moving. Student B wants to stop the motion of the box. Which statement describes the strength and direction of the force Student B would need to apply to the box?

• Student B pushes with a force greater than 50 N to the left.

• Student B pushes with a force less than 50 N to the right.

• Student B pushes with a force equal to 50 N to the right.

• Student B pushes with a force less than 50 N to the left.

Tags

NGSS.MS-PS2-2

What is the average speed of the toy car in centimeters per second (cm/s)?

• 0.3 cm/s

• 2.9 cm/s

• 20.0 cm/s

• 58.0 cm/s

Tags

NGSS.MS-PS3-1

Which distance-time graph shows an object that experiences an unbalanced force?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-2