Newton's Laws
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- Newton's First Law of Motion Unless acted upon, an object in motion stays in motion: an object at rest stays at rest.
- Newton's Second Law of MotionAn object will accelerate in the direction of a force acting on it.
- Newton's Third Law of MotionFor every action, there is an equal opposite direction.
- The football will stay at rest until the kicker kicks the ball into motion. The football is not moving until it is kicked. The kicker is putting the football in motion. The football stays in motion until it hits the net, which is an outside force.
- Newton's First Law
- You apply the same force to push both a car and a bike forward. The bike will have more acceleration than the car because the bike has less mass. The car has more mass so it takes more to get it moving. Since the bike has less mass it is easier to get into motion.
- Newton's Second Law
- If the boy jumps on the diving board then it will spring back and force him up into the air and down into the pool. When the boy jumps off the diving board the diving board pushes the boy upward and into the pool.
- Newton's Third Law
- An object in motion will continue with constant speed and direction unless acted on by an unbalanced force. The wheelbarrow is being pushed by the farmer with a constant speed. Since the wheelbarrow is in constant speed it will not speed up or slow down unless somthing else acts on it.
- If the same force is applied to an object with greater mass, the object accelerates at a slower rate because it adds inertia. So here the cart on the right has more mass than the one on the left. This means that the right one takes longer to get going.
- More Acceleration
- Less Acceleration
- When you jump off a small rowing boat into the water, you will push yourself forward towards the water. The same force you used to push forward will make the boat move backward.
- Action
- Reaction
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