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What is net force?

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**All the forces acting on an object**

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If the forces acting on an object are going in the same direction, you would _________ them together to get the net force.

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ADD

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If the forces are acting on an object are going in opposite direction to each other, you would _________ them together to get the net force.

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Subtract

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What is inertia?

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**The tendency of an object to resist a change in its motion**

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**The greater the mass of an object will ______ its inertia.**

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increase

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What is weight?

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**The force of gravity on a person or object on the surface of a planet**

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**How can we increase acceleration of an object?**

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Decrease its mass Increase force

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What is friction?

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**The force that one surface exerts on another when the two rub together**

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**What is rolling friction?**

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**Occurs when an object rolls over another object**

Example: bike tire on a road

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What is free fall?

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**Occurs when the only force acting on a falling object is gravity**

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**Air resistance is a form of __________**

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Friction

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**The Law of Universal Gravitation states ____________________**

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**Any two objects in the universe are attracted to each other**

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**What is the formula for momentum**

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Mass x velocity

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What is force?

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**A push or pull on an object**

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**How can you increase momentum?**

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**Increase the velocity (speed) of the object**

Increase the mass of the object

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What is mass?

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**The amount of material (matter) in an object**

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**How can you increase friction?**

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**Make the surfaces rougher**

Example: sand on an icy sidewalk

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What is gravity?

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**The force that pulls objects toward earth**

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**What is Newton’s third law and give an example.**

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**For every action there is an equal and opposite reaction**

Example: a hammer hits a nail and the nail exerts a force back on the hammer

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**If forces on an object are balanced,**

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**The object will never change its motion (move)**

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**If the forces on an object are unbalanced,**

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**There will be a change in the objects motion**

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**What is the formula that describes Newton’s 2nd law of motion?**

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**Acceleration = net force x mass**

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**What are two factors that affect gravitational pull?**

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Mass of the objects The distance between the objects

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**On the arrow below, what does the point of the arrow indicate?**

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**The direction of the force**

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**On the arrow below, what does the length of the arrow indicate?**

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**The strength of the force**

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**In what direction is the net force acting?**

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To the left

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**From what direction must force be applied so that forces are balanced?**

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To the left

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**If a third force is applied to the object, in what direction will the object move?**

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Up and to the left

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