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Newton's 1st Law Newton's 2nd Law Newton's 3rd Law Friction Calculations Miscellaneous 100 100 100 100 100 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 500 500 500 500 500 500

Describe Newton’s 1st Law of Motion.

Objects at rest stay at rest and objects in motion maintain their velocity unless acted on by an unbalanced force.

What is another name for Newton’s 1st Law?

Law of Inertia

Define ‘inertia’. Newton's 1st Law 300

An object’s tendency to resist a change (in motion).

True or false: If an object has a greater force acting on it, it will have a greater inertia. Explain. Newton's 1st Law 400

False. Inertia isn’t related to force False. Inertia isn’t related to force. Inertia is related to mass… the greater the mass the more inertia.

Explain how inertia effects: A coffee cup sitting on a desk Newton's 1st Law 500 Explain how inertia effects: A coffee cup sitting on a desk A person traveling in a car when the car stops suddenly

The coffee cup is at rest and has mass, so it will stay at rest unless a force changes it’s motion The person has mass so will stay in motion at the same speed and in the same direction unless an unbalanced force changes their motion

What is Newton’s 2nd Law Newton's 2nd Law100

(Unbalanced) Force = mass x acceleration F=ma

If mass stays constant, as force decreases acceleration ______________. Increases stays the same C. Decreases D. Not enough info given Newton's 2nd Law200

C. Decreases

If acceleration stays constant, as force increases mass______________. stays the same C. Decreases D. Not enough info given Newton's 2nd Law300

A. Increases

If force stays constant, as mass increases acceleration ______________. stays the same C. Decreases D. Not enough info given Newton's 2nd Law400

C. Decreases

When a gun is fired, although the force of the bullet traveling forward and the force of the gun traveling backward are equal, you don’t get hurt. Explain using Newton’s 2nd law. Newton's 2nd Law500

The action/reaction forces are equal so: Because the bullet is so small in mass it has a greater acceleration and because the gun has a greater mass it has a smaller acceleration.

Define Newton’s 3rd Law. Newton's 3rd Law 100

For every action force there is a reaction force that is equal in size and opposite in direction.

Newton's 3rd Law 200 According to Newton’s 3rd Law, if the action force is a foot pushing backwards on the floor, then what is the reaction force?

The floor pushing forwards on a foot

Which statement about action-reaction forces is incorrect? There are always two They are always equal They always act on the same object They always occur at the same time Newton's 3rd Law 300

c. They always act on the same object (They act on each other)

True or false: One example of an action-reaction pair is gravity and normal force acting on objects on the ground. Explain Newton's 3rd Law 400

False, Gravity and Normal Force act on the same object, action-reaction pairs act on eachother

Explain how Newton’s Cradle shows Newton’s 3rd Law Explain how Newton’s Cradle shows Newton’s 3rd Law. Then give another example of the 3rd Law at work Newton's 3rd Law 500

When one sphere is released it exerts an action force on the rest, but an equal reaction force is exerted back in the opposite direction. Examples vary.

Friction 100 Define friction.

The force that opposes motion that will eventually slow objects that are in motion

What are the two main types of friction, define each?

Static: at rest and Kinetic: in motion

DAILY DOUBLE Friction 300

What are the 3 types of Kinetic Friction? Give an example for each.

Sliding, Rolling, Fluid

Can a moving object ever travel in the same direction as friction Can a moving object ever travel in the same direction as friction? Can a moving object ever travel in the same direction as applied force? Friction 400

No/ Yes Friction always opposes motion, but applied force can change direction to slow an object

Explain how to increase and decrease friction.

Increase: make a surface rougher, add weight, sand/salt, etc. Decrease: lubricants, replace sliding friction with rolling friction, decrease weight, etc.

What is the formula to calculate momentum? Calculations100

Momentum= mass x velocity P=mv

If mass is 20kg and acceleration is 14.2 m/s2 north, find force. Calculations200

284 N north

Calculations300 What are the formulas to calculate mass and acceleration?

m= F/a a=F/m

If an object has a momentum of 1000 kg/m/s going west, and the mass of the object is 25 kg, what is the velocity? Calculations500

40 m/s west

Calculations400 What is the mass of an object traveling 2.8 m/s2 south if the force is 178.3 N?

63.68 kg

What does it means if measurements are vector or scalar? Miscellaneous 100

Vector- has direction Scalar- no direction

This is necessary for all objects to accelerate. Miscellaneous 200

Unbalanced Forces

Explain the difference between mass and weight and how each will be affected by gravity. Miscellaneous 300

Mass is the amount of matter in something, weight is the force of gravity acting on an object’s mass. Mass doesn’t change, but weight will change if there is a shift in gravity.

Miscellaneous 400 Give an example of each of Newton’s Laws

Answers will vary.

Daily Double! Miscellaneous 500

Miscellaneous 500 Draw 2 examples of free body diagrams: 1). An object at a constant speed to the right 2. An object speeding up to the right.