Question 1

A hockey puck sliding across a frictionless ice rink, requires a horizontal force on it to keep it in motion.

Accepted Answer

false

Answer

true

Question 2

When a car drives in circle at a constant speed, its acceleration is a_c=v²r.

Accepted Answer

false

Answer

true

Question 3

As a ball falls freely, the distance it falls in each second is increasing.

Accepted Answer

true

Answer

false

Question 4

A quantity that has both magnitude and direction is a vector.

Accepted Answer

true

Answer

false

Question 5

A bicycle and a parked car have a head-on collision. The force of impact will be the same both on the bicycle and on the car.

Accepted Answer

true

Answer

false

Question 6

A bug on a turntable will make less turns per minute if it is located near the center of the turntable.

Accepted Answer

false

Answer

true

Question 7

The rate at which work is done is power.

Accepted Answer

true

Answer

false

Question 8

Gravitational Potential Energy is the energy an object has because
of its speed.

Accepted Answer

false

Answer

true

Question 9

The direction of friction is always opposite to the direction of movement.

Accepted Answer

true

Answer

false

Question 10

The SI unit of work is the Newton.

Accepted Answer

false

Answer

true

Question 11

Suppose a car is moving in a straight line and steadily increases its speed. It moves from 30km/h to 40km/h the first second and from 40 km/h to 50km/h the next second. The car’s acceleration is

Accepted Answer

10km/h/s

Answer

40km/h/s

Answer

5km/h/s

Answer

30km/h/s

Question 12

The law of inertia states that an object

Accepted Answer

all of the above

Answer

at rest will remain at rest unless acted on by an outside force

Answer

will continue moving at the same velocity unless an outside force act on it

Answer

will continue moving in a straight line unless an outside force acts on it

Question 13

How much force is needed to accelerate a 4-kg physics book to an acceleration of 9m/s2?

Accepted Answer

36N

Answer

12N

Answer

3N

Answer

0.33N

Question 14

If you lift one load up four stories, how much work do you do compared to lifting one load up only one story?

Accepted Answer

four times as much

Answer

the same amount

Answer

twice as much

Answer

one quarter as much

Question 15

The reason airbags are used in cars is that they

Accepted Answer

increase the time of impact in a collision.

Answer

increase the force of impact in a collision.

Answer

decrease the momentum of a collision.

Answer

decrease the impulse in a collision.

Question 16

A table-tennis ball gun is fired. Compare to the force on the ball, the force on the gun is

Accepted Answer

the same

Answer

smaller

Answer

larger

Answer

there’s not enough information to say

Question 17

How much power is required to do 250J of work on an object in 5 seconds?

Accepted Answer

50W

Answer

2W

Answer

100W

Answer

200W

Question 18

A car travels in a circle with constant speed. The net force on the car

Accepted Answer

is directed toward the center of the curve

Answer

is directed forward, in the direction of travel

Answer

is zero because the car is not accelerating

Answer

none of the above

Question 19

If you are trying to lean over and touch your toes while your back is against a wall, it will help to have

Accepted Answer

all of these.

Answer

most of your weight in your legs.

Answer

very long feet.

Answer

a low center of gravity.

Question 20

Three balls are coming down from the same height but through different paths. A is in a vertical free fall path down, B follows a sloped straight-line path down and C follows a curved path down. Considering the Potential and Kinetic Energy changes and ignoring friction, which ball has the greatest speed when it reaches the ground.

Accepted Answer

All the same

Answer

ball C

Answer

ball A

Answer

ball B

Question 21

What is the average acceleration of a car that goes from rest to 75km/h in 5 seconds? [Give your answer in units km/h/s]

Accepted Answer

15 km/h/s

Question 22

A ball is thrown horizontally from the top of a tall cliff. Ignoring air drag, what vertical distance will the ball have fallen after 5 seconds?

Accepted Answer

125metres

Question 23

21. What is the magnitude of the resultant of a 3-N force acting vertically upward and a 4-N force acting horizontally?

Accepted Answer

5 N

Question 24

A car accelerates from rest to 30 m/s in 10 seconds. What is the car’s acceleration? Assuming that the car weighs 20000N, calculate the approximate force acting on the car?

Accepted Answer

6000 Newtons

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