Identifying the Laws
What is Newton's First Law?
A tendency to resist changes in motion
What is inertia?
A llama weighting 200 kg needs to be transported on a stretcher. The upward acceleration on the stretcher is 0.63 m/s/s. What is the net force needed to achieve this acceleration?
What is 126 N
You and a friend are pulling on a rope in opposite directions as hard as your can. What is the "equal and opposite force" to the force of your hand pulling on the rope?
What is: The force of the rope pulling on your hand in the opposite direction?
Equation used to solve for mass given acceleration and force
What is
m = F/a?
The runner moved faster when he pushed harder with his legs
What is Newton's Second Law?
A hockey puck is sliding on a frictionless ice surface with a constant velocity of 5 m/s. Suddenly, a player applies a force of 3N to the puck in the direction of its motion for 2 seconds. What happens to the velocity of the puck while the force is being applied?
What is accelerate in the direction of its motion?
You are an astronaut exploring a distant planet called Xylon, the acceleration due to gravity is -15 m/s/s. You encounter a creature that exerts a force of 300 N on the ground when it stands still.
What is 20 kg?
Explain why we are able to accelerate forward when starting to run?
What is: The striking foot pushes backward against the ground. The friction with the ground provides and equal and opposite force forward.
In a free-body diagram, what does the length of an arrow represent?
What is Magnitude of the force?
A kayak was propelled backwards, when the paddle pushed forward
What is Newton's Third Law?
A hockey puck is sliding on a frictionless ice surface with a constant velocity of 5 m/s. Suddenly, a player applies a force of 3N to the puck in the direction of its motion for 2 seconds. What happens to the velocity of the puck while the force is being applied?
What is continue moving at its new, increased velocity?
A 5 kg box is pushed across a horizontal surface with a constant force of 20N. The frictional force opposing the motion is 5N. Calculate the acceleration of the box.
What is 3 m/s/s?
A box stands on a table. Identify all action-reaction forces between the box and the table
What is:
Force 1: The box pushing down on the table
Force 2: The table pushing up on the box
Why does a rocket not need air to accelerate?
What is rocket-gas force pair?
The professional baseball pitcher threw the baseball twice as fast as the 10 year old
What is Newton's Second Law?
A toy car is moving at a constant speed of 2 m/s on a smooth, horizontal surface. It hits a rough patch where friction is present. What happens to the car's motion as it moves through the rough patch?
What is: experience negative acceleration?
A 5 kg block is initially at rest on a horizontal, frictionless surface. A 10 N force is applied to the block for 5 seconds. What is the velocity of the block at 5 seconds?
What is 10 m/s
A horse pulls forward on a carriage with a given force. By Newton's Third Law, the carriage must be pullong on the horse backward with an equal and opposite force. Given this, what explains why the horse and carraige can move forward?
Define Newton's Third Law
What is: For every force from object A acting on object B, there is an equal but opposite force from object B acting on object A
A skateboard runs into a rock and the rider falls forward.
What is Newton's First Law?
A passenger is sitting in a car that is initally at rest. The car accelerates forward. Describe what happens to the passenger's body as the car accelerates
What is: remain at rest?
Calculate the net force needed to accelerate a 350 g ball forward at a rate of 1.2 cm/s/s?
Two ice skaters, Skater A and Skater B, are standing on a frictionless ice rink. Skater A has a mass of 50 kg, and Skater B has a mass of 70 kg. They push off each other and move in opposite directions. If Skater A accelerates at 2 m/s/s, what is the acceleration of Skater B?
What is -1.43 m/s/s?
A box experiences the following force: 5N to the right, 7N to the left, 2N upward, 7N downward, -8N left, and -2N to the right. What is the net force in the x and y directions?
What is:
Fx = 4N to the right
Fy = 5N down