Speed
A car travels 150 meters in 10 seconds. What is its speed?
15 m/s
What makes velocity different from speed?
A car increases its velocity from 10 m/s to 30 m/s in 5 seconds. What is the car’s acceleration?
4 m/s2
A pencil falls from your desk to the floor when you let go of it. What force causes the pencil to fall?
gravity
A 4 kg object accelerates at 3 m/s². What is the force acting on the object?
12 N
A runner covers 400 meters in 50 seconds. What is the runner’s speed?
8 m/s
A car travels 60 meters east in 12 seconds. What is its velocity?
5 m/s east
A car travels down the highway at a steady 25 m/s east. What is its acceleration?
0 m/s²
A soccer ball is sitting still on the field. It will not move unless someone kicks it. Which of Newton’s Laws explains this?
Newton’s First Law (Law of Inertia)
A force of 45 N causes an object to accelerate at 9 m/s². What is the object’s mass?
5 kg
A bike moves at a constant speed of 6 m/s and travels 72 meters. How long does the trip take?
12 seconds
A runner moves at 5 m/s south and travels 100 meters south. How long does the trip take?
20 seconds
A bicyclist is moving 15 m/s west. She slows down to 5 m/s west in 5 seconds. Is her acceleration positive, negative, or zero?
negative
Two objects are pushed with the same force. Object A has a much larger mass than Object B. Which object will have the greater acceleration?
Object B will have greater acceleration
A 10 kg cart is pushed with a force of 50 N. What is the cart’s acceleration?
5 m/s2
A train travels at 20 m/s for 45 seconds. How far does it go?
900 meters
A plane flies at 80 m/s west for 30 seconds. How far does it travel west?
2,400 meters
A skateboarder starts at 2 m/s and accelerates at 3 m/s² for 4 seconds. What is the skateboarder’s final velocity?
14 m/s
When a swimmer pushes water backward, the water pushes the swimmer forward. Which law does this demonstrate?
Newton’s Third Law (for every action, there is an equal and opposite reaction)
A 120 N sled is being pulled across the snow to the right with a force of 40 N. There is 10 N of friction opposing the motion. Draw the free-body diagram, labeling all forces with arrows and values.
A student walks 120 meters in 80 seconds, then continues another 80 meters in 40 seconds. What is the student’s average speed for the entire trip?
1.67 m/s
Car A is moving 20 m/s east and continues moving 20 m/s east without changing speed or direction.
Car B is sitting still at a red light. Which car has constant velocity, and which car has zero velocity?
Car A has constant velocity, and Car B has zero velocity
A runner accelerates from 5 m/s to 17 m/s at a rate of 4 m/s². How long did this acceleration take?
3 seconds
A heavy truck and a small car collide. The truck experiences a small acceleration, while the car experiences a much larger acceleration. Which of Newton’s Laws explains why the accelerations are different?
Newton's 2nd Law (acceleration depends on mass)
A 60 N box is pushed across the floor to the right with a force of 35 N. There is 15 N of friction. What is the net force on the box?
20 N