Forces & Newton's Laws

Earth's natural force that pulls objects down. 

• contact
• gravity
• friction
• mechanical 

The force of materials sliding against one another. This force works against an objects motion. 

• contact
• gravity
• friction
• inertia 

If the net force is equal to zero, the forces acting on the object are 

• balanced
• unbalanced

The unit of force is

• m/s
• m/s^2
• newton
• kg

What is defined as a push or pull?

• force
• motion
• vector
• speed

An _______ force must act on an object for it to CHANGE it's motion

• balanced
• unbalanced
• gravitational
• electrical

What law is best described by inertia?

• 1st
• 2nd
• 3rd

What law is demonstrated by the picture?

• 1st
• 2nd
• 3rd

An object's resistance to a change in motion. 

• Friction
• Inertia
• Force
• Gravity

Which answer choice best explains why tractor trailers take more time to speed up & slow down than regular cars?

• Tractor trailers have less mass and require less force to move.
• Tractor trailers have more mass and require more force to move.
• Tractor trailers have less mass and require more force to move.
• Tractor trailers have more mass and require less force to move.