KIN 440 Test 1

Which of the following will lead to the greatest increase in velocity? Decrease the change in time; decrease the acceleration Decrease the change in time; increase the acceleration Increase the change in time; decrease the acceleration Increase the change in time; increase the acceleration

Increase the change in time; increase the acceleration

Which of the following will lead to the greatest increase in displacement? Decrease the change in time; decrease the velocity Decrease the change in time; increase the velocity Increase the change in time; decrease the velocity Increase the change in time; increase the velocity

Increase the change in time; increase the velocity

Which of the following is an example of relative velocity? The velocity of your car relative to another car The velocity of your car relative to Earth The velocity of your car relative to the posted speed limit

The velocity of your car relative to another car

True or False? A positive acceleration means a body is speeding up only if there is a single, positive direction of travel.

True

True or False? A steeper slope on a position-time curve represents a higher velocity.

True

True or False? Displacement is a vector.

True

True or False? If a body starts with zero velocity and ends with zero velocity, then the area under the positive acceleration curve must be equal to the area under the negative acceleration curve.

True

True or False? One stride is equal to two steps.

True

True or False? Speed is a scalar.

True

True or False? The acceleration is positive if you are speeding up in the positive direction.

True

True or False? The sign of the velocity vector is always in the direction of the displacement vector.

True

True or False? The velocity of a runner as he crosses the finish line is an example of instantaneous velocity.

True

What variable describes how fast something is moving in a particular direction? Acceleration Speed Velocity

Velocity

Which of the following quantities is a vector? Distance Speed Velocity

Velocity

What is the correct symbol for displacement D ∆d ∆p

∆p

What happens to the displacement if the velocity is increased for the same amount of time? It decreases It stays the same it increases

it increases

A body's initial position was -20 m from the origin and its final position was -10 m 1 second later. What was the body's displacement? -10 0 +10

+10

A body's initial position was +10 m from the origin and its final position was -10 m 1 second later. What was the body's displacement? -20m -10m +20m

-20m

Angela has to sprint 30m to get to the ball. Which kinematic variable is most important to her success? Acceleration Horizontal ground reaction force Peak velocity

Acceleration

What is represented by the slope of a velocity-time curve? Acceleration Displacement Velocity

Acceleration

What variable describes how quickly something is speeding up or slowing down? Acceleration Speed Velocity

Acceleration

What is represented by the slope of a velocity-time curve? Change in acceleration Change in position Change in velocity

Change in velocity

What is represented by the area under a velocity-time curve? Acceleration Displacement Velocity

Displacement

What is the physical length that a body has traveled during a period of time? Displacement Distal Distance

Distance

A negative velocity means that the body is slowing down. True False

False

True of False? In biomechanics, a "body" always refers to a person's body.

False

True or False? Acceleration is the most important variable in determining the outcome of a marathon.

False

True or False? The acceleration is negative if you are slowing down in the negative direction.

False

True or False? The acceleration is positive if you are speeding up in the negative direction.

False

True or False? The origin should always be located at the start of the movement.

False

True or False? Velocity is a scalar.

False

Which of the following had the greatest displacement? Initial Position = -20 m; Mid Position = 0 m; Final Position = -20 m Initial Position = 0 m; Mid Position = +10 m; Final Position = +20 m Initial Position = +20 m; Mid Position = 0 m; Final Position = -20 m

Initial Position = +20 m; Mid Position = 0 m; Final Position = -20 m

What happens to the time to complete a movement if velocity is increased? It decreases It stays the same It increases

It decreases

What happens to the velocity if the acceleration is in the opposite direction of the direction of travel? It decrease It stays the same It increases

It decreases

What happens to the velocity if the acceleration is in the same direction as the direction of travel It decreases It stays the same It increases

It increases

A runner's velocity is -10 m/seC) What can be said about her direction of travel? It is in the positive direction. It is in the negative direction. You cannot tell without more information.

It is in the negative direction.

A body's initial position was +10 m from the origin and its final position was -10 m 1 second later. What was the average velocity during this time? Negative Zero Positive

Negative

If body A has a greater velocity than body B, then what is the velocity of body A relative to body B? Negative Positive Zero

Negative

What is a body's location in a frame of reference? Displacement Position Space

Position

A body's initial velocity was -20 m/sec and its final velocity was -10 m/seC) What was the average acceleration during this time? Negative Zero Positive

Positive

What is a ratio between a change in one quantity and a change in time? Radical Rate Ratio

Rate

What quantity is derived from dividing one number by another number? Radical Rate Ratio

Ratio

What quantity describes how fast something is moving without consideration for direction? Acceleraion Speed Velocity

Speed