Units
Speed
Momentum
Acceleration
Graphs
100

What is the correct unit for speed?

a)m/s - metres per second

100

What is the difference between speed and velocity?

Velocity also has a direction, speed does not.

100

To calculate momentum, which pieces of information do you need?    

The mass of the object and its velocity.

100

What does acceleration describe?

a change in velocity

100

What goes in the x-axis of the graphs seen in class?

time (s)

200

What is the SI unit for time?

seconds or hours

200

Write down the equation to calculate speed.

s=d/t

200

A 2 kg ball is moving at a velocity of 5 m/s towards the goal. What is the momentum of the ball?

10 kg·m/s towards the goal

200

To calculate acceleration, which pieces of information do you need?    

The time taken to change velocity.

200

What does a horizontal (flat) line on a distance-time graph indicate?

a)The object is not moving.

300

What is the SI unit for distance?

m or km

300

A car travels 150 kilometers in 3 hours. What is the average speed of the car?

50 km/h

300

A 650g ball is moving at a velocity of 12 m/s towards the goal. What is the momentum of the ball?

7.8 kg·m/s

300

If you were given a negative value for acceleration, what could this mean?

The object is slowing down.

300

On a velocity-time graph, what does a horizontal (flat) line show?

The object is moving with a constant speed.    

400

What is the correct unit for acceleration?

m/s2

400

Jane runs a 100 meter race in 8 seconds. What was her average speed?

12.5 m/s

400

A soccer ball is at rest and is kicked with a force that causes it to move at 12 m/s to the right. The momentum is 18 kg•m/s. What was the mass of the soccer ball?

 1.5 kg

400

Explain why an object moving in a circle is accelerating, even if it moves with a constant speed.

changing direction

400

PAPER AND PENCIL: Sketch a distance-time graph for a journey along the motorway where the driver stopped once for petrol.

l                        /

l         _______/

l       /

l    /

_/_________________________

                     time

500

What is the correct unit for momentum?

kg•m/s

500

How long does it take a car traveling at an average speed of 20 m/s to complete a 4 km journey? 

200s

500

Two objects, a 3 kg ball and a 6 kg ball, are moving towards each other. The 3 kg ball has a velocity of 4 m/s, and the 6 kg ball has a velocity of 2 m/s. What is the total momentum of the system before the collision if they move towards each other?

0 kg·m/s

500

A plane is traveling at 80 m/s. To prepare for landing, it decreases its speed to 50 m/s in 120 s.

-0.25 m/s2

500

Explain how the area under a velocity-time graph may be found, and its use.

finding distance