(law of inertia)(law of inertia)

Newton’s First Newton’s First LawLaw

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

An object at rest will An object at rest will continue to continue to stay at stay at

restrest unless an outside unless an outside force acts on it and …force acts on it and …

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

an object in motion will an object in motion will continue to continue to stay in stay in

motionmotion at constant speed at constant speed in a straight line unless in a straight line unless

an outside force an outside force

acts on itacts on it

FORCE is a push or a FORCE is a push or a pull applied to an object pull applied to an object that will cause it to start that will cause it to start moving, stop moving or moving, stop moving or

change its speed or change its speed or directiondirection

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

FRICTION is the force FRICTION is the force that acts in the that acts in the

opposite direction of opposite direction of the motion of the the motion of the

objectobject

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

MASS is the measure of MASS is the measure of the amount of matter in an the amount of matter in an

objectobject

measured in grams (g) measured in grams (g)

or kilograms (kg) or kilograms (kg)

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

WEIGHT is a measure of WEIGHT is a measure of the force of gravity on the the force of gravity on the

mass of an objectmass of an object

measured in Newtons (N) measured in Newtons (N)

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

Newton’s First Law Newton’s First Law (law of inertia)(law of inertia)

INERTIA is a property of an INERTIA is a property of an object that describes how object that describes how hard it is to change the hard it is to change the

motion of the objectmotion of the object

more mass means more more mass means more inertia inertia

REVIEW QUESTIONSREVIEW QUESTIONS

1.1. What is the difference between What is the difference between mass and weight?mass and weight?

2.2. Which has more mass, 12 g of Which has more mass, 12 g of feathers or 12 g of lead?feathers or 12 g of lead?

3.3. When an astronaut is living on the When an astronaut is living on the International Space Station, what International Space Station, what happens to his mass?happens to his mass?

4.4. What would the mass of a dog be if What would the mass of a dog be if it has a weight of 100N?it has a weight of 100N?

5.5. What would the weight of an apple What would the weight of an apple be if it has a mass of 1.5 kg?be if it has a mass of 1.5 kg?

6.6. What is a force?What is a force?

REVIEW QUESTIONSREVIEW QUESTIONS

7.7. What is friction?What is friction?

8.8. What causes friction on a moving What causes friction on a moving object?object?

REVIEW QUESTIONSREVIEW QUESTIONS