What is a force Label the forces acting

What is a force? Label the forces acting on this car. Can you identify the interaction pairs? What 3 things can forces do? Forces Y 7 arrow tells you which force is bigger or smaller. For each of the diagrams, draw and label 2 force arrows. Name each of these contact forces: f_______ is greatest on r____ surfaces. Forces can be balanced or unbalanced. The size of the u____ a__ _______ The larger the surface area the _____ the force. Car accelerating A parachute falling Name each of these non-contact forces: Car at constant speed _________ The closer the object the ______ the force Object floating on water Object staying floating in the middle of water

Gravity, Weight and Mass Hooke’s Law and Extension M______ measures how much material an object is made of. It is measured in k_________. What is Hooke’s Law? : _________ W____ measures the force of gravity on an object. Because w_____ is a force, it is measured in N________. ______________________________________ Extension of spring (cm) Data interpretation: _______ never changes. _______ changes because it is a force affected by the size of gravity; the bigger the mass, the ____ the weight. Gravitational field strength, mass and weight Weight (N) = mass (kg) x gravitational field strength (N/kg) 1. Complete the table: Planet Mercury Earth Jupiter Neptune Pluto Your mass (kg) 50 kg Gravitational field strength (N/kg) 3. 7 10. 0 Your weight on the planet (N) Weight (N) 1. What is the extension of the spring at 2. 6 N? 2. What force is required to extend the spring by 12 cm? 3. Up to 6 N, does the spring follow Hooke’s law? Explain. 4. After 7 N, what happens? Why? 1155 11. 0 0. 7 2. Which planet has the smallest g? 3. Looking at the g for Jupiter, what can you deduce about the mass (size) of Jupiter compared to the mass of Earth?