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Which type of force is a non-contact force? (A. Applied Force B. Friction C. Magnetic Force)
Magnetic Force
A boat floats on water because of upthrust. (True or False)
True
The normal force always acts in the same direction as gravity. (True or False)
False
What force helps an airplane stay in the air?
Lift
Question: Who discovered gravity?
Sir Isaac Newton
You are riding a bicycle, and you suddenly hit the brakes. What force stops the bicycle?
Friction
How did Sir Isaac Newton discover gravity?
Sir Isaac Newton discovered gravity when he saw an apple fall from a tree. He realized that a force must be pulling objects toward the Earth.
When two forces are balanced, an object will stay still or continue moving at the same speed.(True or False)
True
A boy pushes a toy car across a smooth floor and then across a rough carpet. The toy car moves farther and more easily on the smooth floor. Explain why this happens using the concept of forces.
The rough carpet creates more friction and makes it slow down faster. In contrast, the smooth floor has less friction, allowing the car to move farther
How does friction help us walk?
Friction between our shoes and the ground stops us from slipping.
Which force slows down a moving object?
Friction
Air resistance helps a parachute slow down. (True or False)
True
You drop a ball from a tall building. Why does the ball fall downward instead of floating?
Gravity pulls the ball down.
Which force pulls objects toward the Earth?
Gravity
The force that makes a magnet attract iron objects and repels same poles called __
magnetic force
Arun have horseshoe and bar magnets. They did an investigation to find out which magnet was strongest. They used a plastic ruler and a metal paper clip. Identify the controlled variable.
object being attracted to the magnet and ruler
A magnet can attract all types of metals. (True or False)
False
Friction makes it easier for objects to slide. True or False
False
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