Physics Exam Review

The sum of all forces acting on an object and direction is called the:

• Contact Force

• Balanced Force

• Unbalanced Force

• Net Force

Weight

• Current in a circuit

• Force exerts on a body due to gravity

• the amount of matter in a body

• energy of a mass due to its motion

Answer explanation

Weight is the force exerted on a body due to gravity.

In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.
• A car approaching a red light
• A car with the cruise control set at 80 km/h
• A car turning a curve at a constant speed

Which of these does not affect the period of a pendulum?

• length

• gravity

• mass

When a car goes around a corner at 20 mph, why do we say it  accelerates?

• The car is accelerating because of the velocity is constant
• The car accelerates because it's going 20 mph
• Cars always accelerate when they are in motion
• The car is accelerating because it's changing direction

A horse gallops around a circular arena.  The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

A push or pull exerted on an object is called a(n):

• Force

• Net force

• Momentum

• Speed

Acceleration only takes place when things speed up. 

• True
• False

As a pendulum gets longer, what happens to the period?

• doesn't change

• decreases

• increases

What is the horizontal acceleration of a projectile?

• 0 m/s²
• 9.8 m/s²