P4 0.0 / 5 ? PhysicsForces and MotionForcesGCSEOCR Created by: idk_elxoCreated on: 14-06-16 12:42 What is it called when an objects speed increases? Accellaration 1 of 24 What does the gradient on a distance-time graph represent? Speed 2 of 24 Can displacement be both positive and negative? Yes 3 of 24 Acceleration is.. How quickly you're speeding up/change in velocity 4 of 24 What does an object resting on a surface experience? A reaction force 5 of 24 When solid surfaces are gripping or sliding past eachother what do they experience? Friction 6 of 24 What do liquids/gases experience? Resitance/drag 7 of 24 What do the arrows show on a diagram of an object? The size/direction of forces 8 of 24 When are forces balanced? When a car drives at a steady speed and the reaction of a surface 9 of 24 What is the resultant force? Overall force acting on an object 10 of 24 Does the speed/direction change when there's a resultant force? Yes 11 of 24 When are the forces unbalanced? When the object is acceleration/speed increases 12 of 24 If the resultant force is bigger what does it mean? The acceleration is higher 13 of 24 What is momentum? How hard it'd be to stop an object moving 14 of 24 When the momentum is constant it means.. Both the mass and velocity are constant 15 of 24 How is momentum increased? Increasing mass or velocity 16 of 24 When a rocket is launched into the sky it moves upwards, why? The thrust is larger than both the gravity and drag 17 of 24 How do seat belts and air bags help the passanger? Increase time for them to stop/slow you down more gradually 18 of 24 What is "work done"? Energy transferred 19 of 24 What is kinetic energy? Movement energy 20 of 24 An increase in kinetic energy means.. The amount of work done (but a little bit less due to wasted energy as heat) 21 of 24 What is GPE? Height energy 22 of 24 When objects fall what happens? KE gained and GPE lost 23 of 24 When/how is GPE increased? By doing work 24 of 24
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