2nd Law

What is Newton's First Law

• F=ma

• Every action has an equal and opposite reaction

• Friction

• An object at rest stays at rest, an object in motion stays in motion.

True or False. Acceleration of an object is directly proportional to the net force acting on it?

• True

• False

An evil ewok threw a rock with a force of 24.6N and an acceleration of 6m/s² at an innocent stormtrooper. What was the rocks mass?

• 4Kg

• 41kg

• 4.1kg

• 46kg

Your car has a mass of 2500 kg and a force of 5000 N. How fast will it accelerate?

• 20 m/s²

• 2 m/s²

• 0.5 m/s²

• 120 N

What happens when unbalanced forces act on an object at rest?

• the object remains at rest

• the object begins moving in an unpredictable direction

• the object begins moving in the direction of the net force

• the object begins moving opposite to the direction of net force

A 20 kg bike accelerates at 10 m/s2. What was the force?

• 25 Newtons

• 20 Newtons

• 200 Newtons

• 10 Newtons

What is the net force?

• 40 N left

• 400 N right

• 0 N Balanced

• 40 N right

What Unit do we Measure Force in?

• Newtons

• Joules

• Kilogram

• Work

Jenny applies a 60 N force to a 20 Kg cart, what is the acceleration of the cart if friction can be neglected?

• 1200 m/s/s

• 0.33 m/s/s

• 20 m/s/s

• 3 m/s/s

What is force?

• A push exerted on an object

• A push or pull exerted on an object

• A pull exerted on an object

• Nothing