Physics Review

Which of the following is NOT an example of unbalanced forces?

• a turning car

• a car breaking to a stop

• a car traveling 60 mph constantly

• a car accelerating down a hill

Which of the following is NOT an example of unbalanced forces?

• a skateboard speeding up down a ramp

• a skateboard popping up in the air, then back down

• a skateboard slowing down to a stop

• a motionless skateboard

Which of the following is NOT an example of balanced forces?

• a roller coaster moving forward at a constant speed of 10 m/s

• a roller coaster sitting motionless while passengers get on

• a roller coaster going around a loop at a constant speed

• The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and ramp.

• The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.

• The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.

• The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

What acceleration results from 63N of force being applied to a 9kg ball?

• 567 m/s²

• 7 m/s²

• 72m/s²

• 54 m/s²

If this cylinder has a mass of 20 kilograms, what is its rate of acceleration? (hint: ___ N = 20 kg x a)

• 0 m/s²

• 65 m/s²

• 1 m/s²

• 20 m/s²

On which toy car was the most force exerted?

• 1

• 2

• 3

• 4

• 13N

• 7N

• 8N

• 12N

Describe this object's motion.

• constant speed

• constant acceleration

• increasing acceleration

• increasing speed

Describe this object's motion.

*multiple answers*

• constant speed

• constant acceleration

• increasing acceleration

• increasing speed