Force, Friction and Newton's Laws

A car speeding up to get through a yellow traffic light is an example of .... (select all that apply)

• balanced Forces

• unbalanced Forces

• acceleration

What is an example of newtons 2nd law

• sleeping

• velocity

• driving

• sitting

Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

The girl on the sled will remain in motion unless

• her motion is changed by magnetic forces.

• she is stopped by an outside force.

• she accelerates at a constant speed.

• the force of friction forcer her to move faster.

A Newton is a unit of...

• force
• inertia
• acceleration
• velocity

A cannonball with a mass of 0.5 kg is flying at an acceleration of 10 m/sec/sec. What is it's force?

• 50 Newtons
• 5 Newtons
• 20 Newtons
• 9.5 Newtons

Mass x acceleration = ?

• force
• inertia
• momentum
• velocity

It takes more force to accelerate the iron man on the left than the iron man on the right because the iron man on the left has more mass. This best describes

• Newton's first law, the law of inertia
• Newton's second law, the law of acceleration
• Newton's third law, the law of action reaction 
• The law of universal gravitation

What is an example of newtons 3rd law

• running

• car crash

• high five

• walking

Which one is balanced?

• top
• bottom
• both
• neither