energy, forces and motion Inv. 2

What is the difference between speed and velocity

• speed includes a direction

• velocity includes a direction

• both include directions

• they are both the same thing

When forces work in the opposite direction, we

• add the forces to find the net force

• are unable to calculate the net force

• subtract the forces to find the net force

• assume they will cancel each other out

Accelerations accurs when an object

• slows down

• speeds up

• changes direction

• all of the above

Which of the following would NOT be a unit used to represent speed.

• seconds

• m/s

• miles per hour

• km/hr

What occurs when all forces combined produce a net force that does NOT equal Zero Newtons?

• balanced forces

• an object remains at a constant speed

• unbalanced forces

• an object that is at rest, remains at rest

What is the unit scientists use to represent a unit of force

• m

• N

• F

• s

The formula for speed is

• time/distance

• change in velocity/change in time

• distance/time

• time X distance

A baseball is thrown a distance of 20 meters. What is its speed if it takes 0.5 seconds to cover the distance?

• 0.025 m/s

• 40 mph

• 40 m/s

• 10 seconds

The graph shown represents

• no motion

• constant speed

• acceleration

• decreased speed

The graph shown represents

• no motion

• constant speed

• acceleration

• decreased speed