# Motion and Forces- Lang

## 18 terms

### Motion is a change in

position over time

### Dan sits in a moving car, As he looks out the window, another car is right next to his. When he looks again, the other car is still right next to his. Which of the following is true?

The other car is moving with the same speed as Dan's car

average speed

### Velocity is

speed in a specific direction

west at 100 m/s

equal to zero

velocity

### On a velocity-time graph, a line that is slanted down from left to right shows

negative acceleration

force

net force

### Janet is sliding a box across the floor. What does she need to know to calculate the force on the box?

mass and acceleration

motion

motion

acceleration

### When you push on a door, the door pushes back with as equal and opposite force. These two forces are known as

action/reaction force pairs

### The momentum of an object is the product of its

mass and velocity

### A bowling ball rolls down the lane and hits some pins before rolling off the lane. What happens to the momentum of the ball as it hits the pins?

Some of the ball's momentum is transferred to the pins.

### Conservation of momentum occurs only when there are

no outside forces