science exam

If the wind is heading south with a force of 5 N, and a car is going north with force of 78936 N, what is the Net Force and Direction?

• 78931 N North

• 78531 N North

• 78931 N South

• 78531 N South

Which of Newton's laws states that the greater the mass of an object, the greater the force needed to accelerate it?

• Newton's 2nd Law

• newtons 1st law

• newtons 3 law

• law of conversation of mass

the rate at which speed or velocity changes

• acceleration

• momentum

• motion

• average speed

The red car rolled 0.5 meters across the table for 2 seconds. The table was 4 meters high. What was the average speed of the red car in m/sec?

• 0.25 m/sec

• 2.25 m/sec

• 2 m/sec

• 4 m/sec

force

• push or pull

• twist

• accerlate

• bend

The sum of all forces acting on an object.

• net force

• total momentum

• combined energy

• aggretate power

Forces that have a net force of zero Newtons

• balanced force

• no accerlation

• unbalanced force

A force is a push or pull measured in what units? 

• newtons

• joules

• kilograms

• watts

how does friction affect speed?

• more friction decreases speed

• friction increases speed

• friction has no effect

• friction decreases accleration

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• friction

• resistance

• momentum

• inertia