Forces

Which is Newtons second law

• Force is equal to an objects mass times its acceleration.

• an object in motion stays in motion or an object at rest stays at rest unless acted on by an outside force.

• law of inertia

• For every action there is an equal and opposite reaction

If you dropped a bowling ball and a golf ball from the top of a building, which one would hit the ground first?

• bowling ball
• baseball
• neither
• both

If a space explorer has a mass of 67kg but their weight is 944.7N? What planet is the explorer on?
(w = m*g)
Saturn: g=11.1 N/kg
Pluto: g=0.42 N/kg
Earth: g=9.8 N/kg
Neptune: g=14.1 N/kg

• Saturn
• Pluto
• Earth
• Neptune

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45 m/s² is a(n)

• Mass

• Force

• Acceleration

• weight

What is the scientific unit used to measure weight?

• grams 
• Liters
• pounds 
• newtons 

F=MA 
Going down a hill a 12 kg sled has a force of 36 N. What is it's acceleration? 

• 2 m/s2
• 3 m/s2
• I don't know
• What?

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If you slide a hockey puck on ice, eventually it will stop because of the friction of the ice. This is an example of which Law of Motion. 

• Newton's First Law 
• Newton's Second Law 
• Newton's Third Law 

According to Newton's Third Law of Motion, when a hammer strikes and exerts a force on a nail, the nail

• disappears into the wood

• moves at a constant speed

• exerts an equal and opposite force back on the hammer

• creates a balanced force

What are balanced forces?

• Forces in the same direction

• Forces of the same size

• forces of the same size in opposite directions

How could you make an object increase its speed?

• use less force
• use more force
• use no force

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