Force and motion

1. Force and motion Josh Kwiatkowski Grade 5 Proof of review

2. Same force, different mass Same mass, different forces It also says that the greater the force applied, the greater the change in motion for a given mass In other words, a large force will produce more acceleration than a small force acting on the same object You can see this law in archery • Newton’s second law says that the greater the mass of the object, the smaller it’s change in motion will be for a given force • This means that the same force will cause an object with small mass to accelerate more than an object with large mass Newton’s second law

3. Newton’s third law states that when one object exerts a force on a second object, the second object exerts a force on the first • These forces are equal in strength and opposite in direction • It is impossible to have one force without an equal and opposite force • For example, if you have ever ridden bumper cars, you know that when a moving car collides with a stationary car, both drivers feel the force of the collision Newton’s third law

4. Newton’s first law says that an object will stay in uniform motion unless a net force acts on the object • Without that force, an object at rest will stay at rest • An object in motion will keep the same speed and direction • For example, a marble will stay on the floor unless you push it • If the marble is already moving, it will continue to move at a constant speed in a straight line until a force acts on it Newton’s first law

5. The formula that describes the relationship between force, mass, and acceleration is: m x a = f • For example, a block with a mass of 12 kg is being pushed • Its acceleration is 5 Using formulas

6. Gravity – the force of attraction between any 2 objects • Force – a push or pull that acts on an object • Friction – the force that results when 2 materials rub against each other • Acceleration – the rate at which the speed or the direction of motion of an object changes over time • Inertia – the tendency of an object to resist any change in motion • Uniform motion – motion where the speed and direction don’t change Vocabluary

7. When the light turns red, the cars speed drops to zero • When the light turns green, the speed climbs from zero • If the car turns a corner, the car changes direction • When an object speeds up, slows down, or changes direction, its motion changes Changes in motion

8. Motion without acceleration called uniform motion • Sir Isaac Newton has three laws of motion • Without a force, an object stay’s at rest What we learned

9. Remember this

10. Thanks for looking