MOTION
What is the definition of motion?
a. The speed of an object
b. A change in an object's position relative to a reference point
c. The direction of an object's movement
d. The force applied to an object
b. A change in an object's position relative to a reference point
How can velocity be different from speed?
a. Velocity includes both magnitude and direction
b. Speed includes both magnitude and direction
c. Velocity is always higher than speed
d. Velocity is always lower than speed
a. Velocity includes both magnitude and direction
What is the gravitational force exerted on an object called?
a. Centripetal force
b. Momentum
c. Friction
d. Weight
d. Weight
What role does friction play in net forces of sliding objects?
a. Reduces overall force
b. Increases overall force
c. Stays constant
d. Increases momentum
a. Reduces overall force
What does Newton’s First Law of motion state about an object in motion?
An object in motion stays in motion at a constant velocity unless acted on by an unbalanced force.
When does centripetal acceleration occur?
a. When an object is moving at a constant speed in a straight line
b. When an object is moving in a circular path
c. When an object is accelerating forward
d. When an object is slowing down
b. When an object is moving in a circular path
A car, a bicycle, a mouse, and a bug have the same velocity. Which has the greatest momentum?
a. The car
b. The mouse
c. The bicycle
d. The bug
a. The car (because momentum = mass × velocity)
Which term best describes the forces on an object with a net force of zero?
a. Balanced forces
b. Unbalanced forces
c. Inertia
d. Acceleration
a. Balanced forces
If a force of 50 N is applied to a mass of 25 kg, what is the acceleration?
a. 25 m/s²
b. 2 m/s²
c. 75 m/s²
d. 5 m/s²
b. 2 m/s² (Acceleration = Force / Mass = 50 N / 25 kg)
Using Newton’s 2nd Law: A pickup truck carrying gravel loses half its mass after gravel falls out. If the net force stays the same, how does the truck's acceleration change?
If the net force stays the same and mass is halved, acceleration doubles (since acceleration = net force / mass).
In which of the following conditions does the car not accelerate?
a. A car moves at a constant 80 km/h on a flat, straight highway.
b. The car slows from 80 km/h to 35 km/h.
c. The car turns a corner.
d. The car speeds up from 35 km/h to 80 km/h.
a. A car moves at a constant 80 km/h on a flat, straight highway.
What is acceleration?
a. The speed at which an object is moving
b. The direction of an object's movement
c. The rate of change of velocity
d. The distance an object travels per unit of time
c. The rate of change of velocity
Which term best describes the forces on an object with a net force of zero?
a. Balanced forces
b. Unbalanced forces
c. Inertia
d. Acceleration
d. 10 N Right (20 N Right - 10 N Left = 10 N Right)
Which of the following is NOT a force?
a. Weight
b. Momentum
c. Friction
d. Air resistance
b. Momentum (momentum is not a force)
How can Newton’s laws be applied to explain the function of seatbelts in car accidents?
Seatbelts apply an unbalanced force to stop a passenger, preventing them from continuing at the same speed and reducing injury according to Newton’s First Law.
A hunter tracks a population of deer to a forest 2 km away and back. He measured their ______________.
a. Distance
b. Momentum
c. Displacement
d. Frequency
a. Distance
Which of the following situations describes a car's velocity?
a. A car moving at 60 km/h
b. A car moving north at 60 km/h
c. A car accelerating at 60 km/h/s
d. A car slowing down from 60 km/h
b. A car moving north at 60 km/h
Which of the following would cause the gravitational force between object A and object B to increase?
a. Increase the mass of object A
b. Increase the distance between them
c. Decrease the mass of object A
d. Decrease the mass of both objects
a. Increase the mass of object A
What is the net force on a dragster with a mass of 900 kg accelerating at 32.0 m/s² west?
Net force = mass × acceleration = 900 kg × 32.0 m/s² = 28,800 N west
What is the difference between a scalar measurement and a vector measurement?
A scalar measurement has only magnitude (size), while a vector measurement has both magnitude and direction.
A speedometer on a vehicle shows which of the following values?
a. Velocity
b. Acceleration
c. Instantaneous speed
d. Momentum
c. Instantaneous speed
Which term describes the tendency of an object to resist a change in motion?
a. Balanced force
b. Net force
c. Inertia
d. Acceleration
c. Inertia
An object always accelerates in the same direction as which of the following?
a. Net force
b. Static friction
c. Air resistance
d. Gravity
a. Net force
A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?
a = 2 m/s2
If two billiard balls collide and one is at rest, how is momentum conserved?
Momentum is conserved because the total momentum before and after the collision remains the same; the moving ball transfers momentum to the stationary ball.
A car starts from rest and accelerates uniformly at 3 m/s2 for 8 seconds.
24 m/s
96 m
120 m
216 m