1 N D Weight = Air – 650 N Streamlined shape of resistance, so sky diver 12 000 N vehicles, lubrication in has constant speed. engines. The weight of the space A hammer is more (a) shuttle decreases. The object will accelerate streamlined than a This is because: in the direction of the feather. There is less mass due to unbalanced force. There is no air fuel being used up. resistance on the moon The shuttle is getting (a) 22.5 N further away from the 0.2 N 1. 92 x 106 N surface of the 0.4 kg 40 kg 0.2 kg 85 kg 1.5 m s-2 1.5 m s-2 Equal, opposite, equal, (a) 372 N opposite. 2418 N (a) 5 m s-2to the right 372 N 2 m s-2to the left (a) Hammer imparts a 0 N 0.2 m s-2 to the force on nail. Nail 10 m s-2 to the left imparts a force back on 75 kg to hammer. 1440 N Foot imparts a force on Saturn ball. Ball imparts a force Seat belts create an back on foot. 13 N kg-1 unbalanced force when a Person pushes down on car brakes allowing a scales. Scales push back Newton’s Laws (p14 19) person to slow down with up on person. – the car. (a) 2 N to the right Air bags and bumpers Shuttle pushes down. 5.5 N to the right increase the time taken to Gases push shuttle up. 4 N to the left slow down during a 10 N to the left collision, reducing the Work Done (p20 21) – force acting on a person. Speed, acceleration. Work done is the energy (a) Weight & air resistance transferred to an object. (a) 120 N Terminal velocity is the 135 N speed at which a falling (a) 3000 J 1.5 kN object stops 155 J 175 N accelerating. 2000 N 53 m s-1 20 N (a) Teams remain at rest. A Weight > Air 10 m – 700 N resistance, so sky diver 45 m 800 N is accelerating. B Weight = Air 16 800 J – Friction is a force that resistance, so sky diver opposes motion. has constant speed. 300 N C Weight < Air – Tread on vehicle tyres, resistance, so sky diver 40 m grips on shoes. is decelerating.
1 N 650 N 12 000 N The weight of the space shuttle decreases. This is because: There is less mass due to fuel being used up. The shuttle is getting further away from the surface of the 85 kg (a) 372 N 2418 N 372 N 0 N 75 kg Saturn 13 N kg-1 Newton’s Laws (p14 – 19) (a) 2 N to the right 5.5 N to the right 4 N to the left 10 N to the left Speed, acceleration. (a) 120 N 135 N 1.5 kN 175 N (a) Teams remain at rest. 700 N 800 N Friction is a force that opposes motion. Tread on vehicle tyres, grips on shoes. Streamlined shape of vehicles, lubrication in engines. The object will accelerate in the direction of the unbalanced force. (a) 22.5 N 0.2 N 0.4 kg 40 kg 1.5 m s-2 1.5 m s-2 (a) 5 m s-2to the right 2 m s-2to the left 0.2 m s-2 to the 10 m s-2 to the left 1440 N Seat belts create an unbalanced force when a car brakes allowing a person to slow down with the car. Air bags and bumpers increase the time taken to slow down during a collision, reducing the force acting on a person. (a) Weight & air resistance Terminal velocity is the speed at which a falling object stops accelerating. 53 m s-1 A – Weight > Air resistance, so sky diver is accelerating. B – Weight = Air resistance, so sky diver has constant speed. C – Weight < Air resistance, so sky diver is decelerating. D – Weight = Air resistance, so sky diver has constant speed. (a) A hammer is more streamlined than a feather. There is no air resistance on the moon 1. 92 x 106 N 0.2 kg Equal, opposite, equal, opposite. (a) Hammer imparts a force on nail. Nail imparts a force back on to hammer. Foot imparts a force on ball. Ball imparts a force back on foot. Person pushes down on scales. Scales push back up on person. Shuttle pushes down. Gases push shuttle up. Work Done (p20 – 21) Work done is the energy transferred to an object. (a) 3000 J 155 J 2000 N 20 N 10 m 45 m 16 800 J 300 N 40 m
dynamics_and_space_problem_booklet.docx