An apple is falling from a tree. The apple´s speed increases as it falls. How does the apple´s motion affect it´s mechanical energy AND kinetic energy?
Mechanical energy remains the same and its kinetic energy increases.
A baseball thrown into the air will continue on its path until which force acts upon it.
Friction
Who discovered the Law´s of motion?
SIR Isaac Newton
Energy can be destroyed
TRUE or FALSE
FALSE
This is the what gravity acts on to give an object its weight
What is Mass?
Name a simple Machine
wheel, axel, pulley inclined plane, ramp
DOUBLE POINTS
STATE THE 1st LAW of MOTION - give an example
An object at rest remains at rest. An object in motion goes at constant speed until an outside force acts upon it.
Back pack on ground - ball on ground - kicked
DAILY DOUBLE!! ANSWER BOTH PARTS FOR DOUBLE POINTS!!!
A 20 kg ball and a 50 Kg ball rest at the top of a ramp. Which has greater Potential Energy? WHY?
50 KG - because it has the GREATER MASS!
The 3 ways thermal energy transferred from one object to another?
What is conduction convection and radiation
What do simple machines do?
Help change direction or amount of force needed to move an object
What is the 2nd law of motion?
DOUBLE POINTS - GIVE AN EXAMPLE
FORCE=MASS X ACCELERATION
Punting a football
A toy cr is released at the top of an INCLINED PLANE. How does it´s energy change as it rolls down?
It´s Kinetic Energy Increases, and it's potential energy decreases.
Thermal energy always moves from _________ to __________?
What is from warmer to colder
What is Energy?
The ability to do work
What is the 3rd LAW of Motion?
DOUBLE POINTS - GIVE AN EXAMPLE
A rock setting on the edge of a cliff has what kind of energy?
Potential
What is the force that is pushing up on a book that is sitting on a desk?
What is the NORMAL FORCE?
A ball rolls on a carpet. The ball experience friction as it rolls. How will friction affect the ball´s motion?
The ball experiences an unbalanced force and will slow down
Because of the 3rd law of motion... If both objects are thrown with the same force, which would move back further after they collided - a 145g baseball or a 45g golf ball
EXPLAIN WHY?
Golf ball - Because the smaller the mass - the greater the acceleration