Question

question 1
1 pts
true or false: acceleration can only be positive.
true
false
question 2
1 pts
if an unbalanced force pushes a toy car in the same direction it was already moving, what will happen?
the toy car will speed up
the toy car will change direction
nothing will change with the car
the toy car will slow down.
question 3
1 pts
what is the definition of acceleration?
the change in velocity multiplied by the time of change
the change in velocity divided by the time during which the change occurs
the change in velocity
the change in speed

Explanation:

Question 1

Acceleration is defined as the rate of change of velocity. If the velocity is decreasing, the acceleration is negative (deceleration). So acceleration can be positive or negative.

According to Newton's second law \(F = ma\) (where \(F\) is force, \(m\) is mass, and \(a\) is acceleration). An unbalanced force in the direction of motion will cause an acceleration in that direction. Since \(a=\frac{\Delta v}{\Delta t}\), a positive acceleration (in the direction of motion) means the velocity (speed in the case of straight - line motion) will increase.

The formula for acceleration is \(a=\frac{\Delta v}{\Delta t}\), where \(\Delta v\) is the change in velocity and \(\Delta t\) is the time during which the change occurs.

Answer:

False

Question 2