Ch. 9 Test

Velocity is

• speed and acceleration
• constant speed
• a frame of reference
• speed in a given direction

Acceleration is

• increasing speed
• decreasing speed
• changing direction
• all of the above

Change in speed over a given period of time is

• velocity
• motion
• speed
• acceleration

Change in speed over a given period of time is

• velocity
• motion
• speed
• acceleration

What is a force?

• a push or pull
• speed or acceleration 
• potential or kinetic energy
• balanced or unbalanced force

What is the force that causes everything to be pulled down to the Earth?

• friction
• gravity
• balanced
• unbalanced

Why does a rolling ball stop?

• Gravity
• Friction
• Waterfalls
• Sand

What Unit do we Measure Force in? 

• Newtons
• Joules
• Force
• Kilograms

The pace an object travels in a certain amount of time

• speed

• acceleration

• Velocity

• motion

Which force produces a change in motion?

• unbalanced force
• balanced force
• gravitational force
• frictional force