This Study Stack is to help you study for Force & Motion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Define "force". | Force is described by its strength and by the direction in which it acts. It is a "push" or "pull"
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| What is the SI unit of measure for force? | The SI unit of measure for force is a "newton" (N).
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| Define "net force". | Net force is the combination of all forces acting on an object.
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| How do you find net force? | Same direction - add the forces
Opposite direction - combine by subtracting
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| Define "unbalanced force". | Whenever there is a net force acting on an object the forces are unbalanced and there is motion.
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| Define "balanced force". | Balanced forces are equal forces acting on one object in opposite directions. There is no motion.
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| Define "friction". | Friction is the force that two surfaces exert on each other when they rub agains each other.
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| What causes friction? | The strength of the force of friction depends on two factors: how hard the surfaces push together and types of surfaces involved.
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| Name the 4 types of friction. | static, sliding, rolling, and fluid
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| Define "static friction". | The friction that acts on objects that are not moving is static friction.
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| Define "sliding friction". | Sliding friction occurs when two solid surfaces slide over each other.
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| Define "rolling friction". | When an object rolls across a surface, rolling friction occurs.
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| Define "fluid friction". | Fluid friction occurs when a solid object moves through a fluid.
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| Define "gravity". | Gravity is a force that pulls objects toward each other.
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| Explain universal gravitation. | The law of universal gravitation states that the force of gravity acts between all objects in the universe.
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| What 2 factors affect gravity? | Mass and distance affect gravity.
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| Define "weight". | Weight is the force of gravity on an object.
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| Explain free fall. | Free fall is when the only force acting on an object is gravity.
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| Explain air resistance. | Air resistance is the upward force exerted on falling objects. Air resistance is not the same for all objects. Objects with greater surface area experience more air resistance.
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| Define "projectile". | An object that is thrown is called a projectile.
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| How does gravity affect objects moving horizontally? | Gravity pulls the object toward the center of the Earth in the same way it pulls a dropped object.
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| What is Newton's 1st Law of Motion? | An object at rest remains at rest and an object in motion remains in motion unless acted upon by an outside force.
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| Define "inertia". | Inertia is the tendency of an object to resist a change in motion.
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| How is mass related to inertia? | The greater the mass of an object, the greater its inertia and the greater force needed to change its motion.
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| What is Newton's 2nd Law of Motion? | Acceleration depends on the object's mass and on the net force acting on the object.
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| What is the equation for Newton's 2nd Law of motion? | Acceleration = Net Force
Mass
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| What are two ways to increase the acceleration of an object? | To increase acceleration, you can decrease mass or increase force.
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| What is Newton's 3rd Law of Motion? | For every action there is an opposite and equal reaction.
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| Why don't action/reaction forces cancel each other? | Action/Reaction forces do not cancel each other because they act on different objects.
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| Define "momentum". | Momentum is a characteristic of a moving object tht is related to the mass and the velocity of the object.
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| What is the formula for momentum? | Momentum = Mass X Velocity
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| Explain conservation of momentum. | The total momentum of any group of objects remains the same, or is conserved, unless outside forces act on the objects.
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Created by:
lonniewood
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