Trilogy – Physics – CHAPTER 5 – Forces

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Presentation transcript:

Trilogy – Physics – CHAPTER 5 – Forces What is a force? Write down the equation for calculating acceleration: Complete this table: Contact forces Non-contact forces What is a contact force? What is a non-contact force? A car is travelling with a velocity of 20 m/s. The driver then increases the velocity of the car to 35 m/s in 7.5 seconds. Calculate the average acceleration of the car. Explain the difference between mass and weight. Speed Velocity Scalar Vector Acceleration Deceleration Drag Gravity Mass Weight How do you calculate average speed? Sam walks 5 km in 45 minutes. Calculate his average speed in m/s. Amelia is walking at an average speed of 1.5 m/s. How far will she walk in one hour? What is a scalar quantity? What is a vector quantity? Circle the correct answer: Mass scalar or vector? Acceleration scalar or vector? Force scalar or vector? Temperature scalar or vector? KEY WORDS: ASSESSMENT:

Trilogy – Physics – CHAPTER 5 – Forces (cont) Calculate the weight on Earth of a 20 kg mass. (On Earth g = 10 N/kg) What would be the mass of this object on the Moon? On the Moon g = 1.6 N/kg) What would be the weight of this object on the Moon? Write down Newton’s first law of motion. Write down the equation that is associated with Newton’s second law of motion. Write down Newton’s third law of motion. Keeping safe on the road! Explain what is meant by the term “Thinking distance” when driving in a car. Explain what is meant by the term “Braking distance”. How are “Thinking distance” and “Braking distance” connected to the “Stopping distance” for a car? Springs A spring has an extension of 0.5 m when it is stretched by a force of 20 N. What is its spring constant? A car has a mass of 2000 kg. What force is needed to give it an acceleration of 4 m/s/s. A car has a mass of 1500 kg and has a resultant forward force of 3000 N acting on it. Calculate its acceleration. The weight of an object is 5 N and on Earth it accelerates downwards with an acceleration of 10 m/s/s. What is its mass? Draw a labelled force diagram for the forces acting on a parachutist falling at a steady speed. KEY WORDS: Balanced forces Resultant force Reaction time Stopping distance Hooke’s Law Spring constant Extension ASSESSMENT: