forces and acceleration

What is a measure of the change of velocity of a moving object?

• speed

• acceleration

• motion 

• velocity 

Which is not an example of acceleration?

• Driving at a constant speed 

• A bat hitting a ball

• Throwing a football 

• Kicking a soccer ball

The force that a person or thing applies to an object 

• gravity

• nuclear forces

• applied forces

• friction

The bottom picture is an example of 

• balanced forces 

• unbalanced forces

Balanced forces always have a net force of 

• 10 N

• 0 W

• 10 W

• 0 N

_____________ causes changes in the speed and/or direction of motion. 

• Speed

• Force

• Velocity

The SI unit for force is 

• Watt (W)

• Power (P)

• Newton (N)

• Force (F)

Objects falling through the air are slowed by the force of 

• velocity 

• acceleration 

• time 

• air resistance 

What force does the ground produce that makes it difficult to push things on the ground?

• Friction

• Gravity

• Density

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s

• 24 m/s²

• 9 m/s²

• 81 km/hr