Definitions
Gravity
the downward pull of an object towards the center of the Earth
Which simple machine reduces friction?
Wheel and axle
If Sled A going down a hill that is covered in snow and Sled B is going down a hill covered with grass; what force will affect the speed of the sleds?
Friction
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200N 150N
50N RIGHT
The length of an arrow determines what? (In terms of force)
The amount of force
Inertia
The tendency of a body to be in a state of rest or in a state of motion
Which machine uses gravity to reduce the amount of power needed to move a machine down or up?
Inclined Plane
If Sled A going down a hill that is covered in snow and Sled B is going down a hill covered with grass; How will friction impact the speed of each?
Because sled a has a lower friction it will move faster than sled b with the higher friction.
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325N 600N
275N LEFT
The head of an arrow determines what? (In terms of force)
Direction of the force
Newtons Law of Motion
A body at rest stays at rest unless a force acts on it. A body in motion stays in motion unless a force acts on it
Which simple machine is an inclined plane wrapped around a cylinder or bar that converts rotational force into forward motion?
A screw
John is moving a wagon down the hill filled with apples. The wagon hit a bump causing the wagon to come to a complete stop. Even though the wagon stopped, the apples flew out of the wagon. Explained why the apples fell out of the wagon.
According to Newtons Law of Motion, an object in motion stays in motion unless a force acts on it causing it to stop. The bump caused the wagon to stop but, due to inertia the apples continued the forward motion.
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125N 125N
There will be no movement of an object when the forces are
Balanced
Friction
The force that holds back the movement of an object
Which simple machine is a machine that uses a wheel and axle, as well as a rope or chain, to make a force go in the opposite direction?
Pulley
Explain the relationship between work and simple machines.
Simple machines such (pulleys, wheel and axles, etc) reduce the amount of work that needs to be used.
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725N 500N
225N RIGHT
Names the 4 types of forces
Push, pull, friction, gravity
Acceleration
The act or process of moving faster or happening more quickly
Which simple machine allows forward force to turn into an outward force in another object?
Wedge
How does a wheel and axle reduce the amount of friction that is applied to an object? For example, how does a wheel and axle reduce the amount of friction when used on a wagon?
A rotating wheel can make work easier by reducing the friction between an object and the surface over which it moves. A wheel reduces friction by allowing the contacting surfaces to roll rather than to drag or slide over each other.
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325N 330N
655N RIGHT
If a man is using a pulley to lift an object off of the ground, what force is he working against?
Gravity