Newton’s first and second law
What is the combination of all forces acting on an object?
Net force
_____ is the transfer of energy to an object by a force that makes an object move in the direction of the force.
Work
What is a force that resists the sliding of 2 surfaces that are touching?
Friction
What is the tendency of an object to resist a change in its motion?
Inertia
A student pushes a wagon 5m across the table using a constant force of 20N. How much work is the student doing on the wagon?
100J
TRUE OR FALSE
energy can be transformed from one form to another but cannot be created or destroyed.
TRUE
A 50N net force acts on a 10kg rock. What is the acceleration?
a= 5m/s squared
Dany does 15J of work in 4 seconds as she lifts a chair off the floor. How much power does Dany use on the chair?
3.75w
Can inexhaustible energy be used?
No
What netforce acting on a 14kg weight produces an acceleration of 1.5 m/s squared?
F= 21N
Corde pushes a chair across the room, using 9 W of power to do 45 J of work. How much time does it take her to push the chair?
t= 5s
What are fossil fuels?
Remains of ancient organisms that can be burned up as an energy resource
A skater moves a distance of 45m in 4.5s, it takes 2 seconds to accelerate. The mass of the car is 1,400kg. What is the force of the car?
F= 7,000N
A child pushes a toy 2.5m across the floor with a constant force of 22N. How much work is the child using on the truck?
w= 55J
The exhaust of a car contains ( ) energy that cannot be used. Known as waste energy
Thermal