Aim: How do we explain motion along an inclined plane?

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Topics: Forces, Apparent Weight, & Friction

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Presentation transcript:

Aim: How do we explain motion along an inclined plane?

Review of the normal force

An object at rest on an Inclined Plane Label the following forces on the diagram above: ( Ignore the blue lines) Friction Gravity (Weight) Normal Force

Vector Resolution of Weight Force The weight force can be resolved into two components: One component is parallel to the surface of the incline (mgsinθ) One component is perpendicular to the surface of the incline (mgcosθ)

Motion along an inclined plane A crate has a mass of 56 kg and is on a frictionless plane inclined at 30 degrees above the horizontal. a) Find the weight of crate. b) Find the components of the weight force. c) Find the normal force. d) Find the net force e) Find the acceleration

Sliding Downhill A 62 kg trunk on ice is going down a hill sloped at 37 degrees.. Draw a freebody diagram. Find the weight of the trunk. Find the components of the weight of the trunk Find the normal force Find the net force on the trunk down the incline. Find the acceleration of the trunk down the incline.

Incline A block of 2 kg sits on top of a 30 degree incline. If the incline is frictionless, what is the acceleration of the block? a=gsinᶿ a=10sin30 a=5m/s2

Draw a freebody diagram for an object being pulled up an incline If this load is being pushed up an incline, draw all forces acting on crate Neglect Friction. Are there any differences from before? There are no differences. The acceleration is still down the incline.

Regents Level Incline Problem

Regents Level Incline Problem

Object moving up an inclined plane A box is sliding up an incline that makes an angle of 15 degrees with respect to the horizontal. The initial speed of the box at the bottom of the incline is 1.50 m/s. How far does the box travel along the incline before coming to rest?