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FORCE , ENERGY AND SIMPLE MACHINES
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Electricity produced from water
Hydroelectric energy
fixed point of lever is known as ______
pivot
how many inclined planes combines to form a wedge?
2
which force is used by a weightlifter to lift objects?
Muscular
what is energy?
The ability to do work.
which class lever is stapler?
class 3
energy possesed by a moving object- kinetic or potential
kinetic
Which force is responsible when a comb rubbed in hair id brought near to paper pieces.
electrostatic
The ability of a material to return to its original shape after being compressed or stretched.
Elasticity
Friction produces _________
Heat
what are the two types of pulley?
Fixed and movable
In class 2 levers what comes in the middle?
Load
The head of an axe is wide at one end and pointed at the other to help cut or trim trees. The axe head is an example of A) a pulley. B a wheel and an axle. C) a wedge.
C
Which two simple machines does this device use to make work easier? A) An inclined plane and a pulley B) wheel and axle and a wedge C) Gears and a lever D ) A wheel and axle and a lever
D
Which one of these would you use to remove the box from the truck? A) A lever B) An inclined plane C) A wheel and axle D) A pulley
B
If the fulcrum is closer to the effort, it will take A) More force to lift the load B) Less force to lift the load C) Equal force to the lift the load D) No force to life the load
A
Which is an example of someone using a simple machine to do work? a. a boy runs across a football field b. a banker counts money c. a mother pushes a stroller up a ramp into a building d. a girl eats a sandwich
c
mother asked Rina to help move some items from the hall closet to the garage. One item she wanted to move was a large box of old school books. Rina tried to lift the box, but could not pick it up. What force was Rina NOT able to overcome?
Friction
If two teams have same force what will happen?
they will not move
Some forces can act over a distance, and others can only act by contact. Which type of force can act only when two objects touch each other? A. gravitational B. frictional C. electrostatic
B
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