Lesson Check Day 13(10pts.)

What term is used to describe an object's speed at one particular moment in time?

• Average Speed

• Instantaneous Speed

• Acceleration

• Velocity

Answer explanation

Instantaneous Speed is the term used to describe an object's speed at one particular moment in time.

Average speed is found by _____.

• multiplying total distance traveled by the total time

• multiplying the displacement by the total time spent

• dividing the displacement by the total time spent

• dividing total distance traveled by the total time

Answer explanation

Average speed is found by dividing total distance traveled by the total time.

Tags

HS-PS2-1

Kaleb is driving his car to the grocery store. The direction and speed at which Kaleb's car is moving is described by its _____.

• Acceleration

• Velocity

• Displacement

• Average Speed

Answer explanation

Kaleb's car's direction and speed are described by its velocity, which includes both speed and direction.

Tags

HS-PS2-2

If an object has constant velocity, then it _____.

• is not moving

• has negative acceleration

• has no acceleration

• has positive acceleration

Answer explanation

If an object has constant velocity, then it has no acceleration. Acceleration is the rate of change of velocity, so if velocity is constant, acceleration is zero.

Tags

HS-PS2-2

Two tennis balls are at the same height and released at the same time. One ball is dropped and hits the ground 5 seconds later. The other initially moves horizontally at 13 m/s.

In how many seconds will second ball hit the ground?

Mathematical Equivalence

ON

Tags

HS-PS2-2

Velocity is speed with __________________________.

• a unicycle helmet

• direction

• fight

Answer explanation

Velocity is speed with direction, as velocity includes both the speed of an object and the direction in which it is moving.

A ping-pong ball rolls forward 6 meters, and bounces backward 3 meters. What was its displacement (distance from the origin)?

• 9 meters

• 6 meters

• 3 meters

• 0 meters

Answer explanation

The displacement of the ping-pong ball is the distance from the origin, which is 3 meters forward. Therefore, the correct answer is 3 meters.

Find the distance Sara walks from A to B,  B to C then C to D?

• 11m

• 3m

• 5m

Answer explanation

Sara walks 3m from A to B, 5m from B to C, and 3m from C to D, totaling 11m in distance.

Joe rides from point A to B to C. What is the displacement?

• 7 m

• 12 m

• 5 m

• 2 m

Answer explanation

The displacement is the shortest distance between the initial and final points, which is 5 meters in this case from point A to C.

Joe rides his bike from point A to point B and then on to point C. What is the total distance traveled?

• 12 m

• 43 m

• 7 m

• 12 m

Answer explanation

Joe travels from point A to point B and then on to point C, which means he covers a total distance of 7 meters.